A Conversation with Ed Welch with TSP2

Ed Welch with TSP2

Author: Lorella Angelini, Angelini Consulting Services, LLC

Ed Welch is the leading preservation engineer supporting the TSP2 bridge program at the National Center for Pavement Preservation (NCPP).  It is safe to say that his level of competence and the passion he has for his job are unmatchable.

Ed is active with the four Regional Bridge Preservation Partnerships, a task that also includes organizing and implementing the yearly TSP2 Regional Bridge Preservation Partnership Meetings as well as the National Conference that takes place every four years.  He participates in many National and Regional TSP2 Working Groups, and the monthly regional teleconferences.

Ed Welch evaluates and supports new initiatives and programs, always making available his knowledge and experience. Even more important, Ed facilitates communication, thus making it possible to create a multi-faceted dialogue between States, Agencies, Industry and Consultants. This dialogue is at the core of the TSP2 Bridge Preservation success story.

I spoke with Ed after the TSP2 National Conference in Orlando, Florida.

Could you introduce yourself? What is your background? Why did you decide to join TSP2? How did it happen?

I am a bridge preservation engineer at NCPP, the National Center for Pavement Preservation at Michigan State University that has a contract with AASHTO for managing TSP2 for both bridges and pavements.

After getting a Bachelor of Science in Civil Engineering from the New England College, I spent four years with HNT&B and then thirty-four years with the New Hampshire DOT.  Nine of those years were with bridge construction and twenty-five with bridge maintenance.

Back then I attended the Sub-Committee of Maintenance (SCOM). As the Bridge Maintenance Engineer for New Hampshire I was able to attend meetings in Alaska, Alabama, Pennsylvania, Minnesota, North, Dakota, Washington State, and New Hampshire, where we all learned about the value of networking and developing relationships from around the country. Wade Casey with FHWA, one of the relationships that I developed at the SCOM Meetings, recommended me to Larry Galehouse, NCPP Director, as a potential candidate for the new TSP2 bridge preservation position. The rest is basically history.

I have been supporting the TSP2 bridge preservation program for about eight years. It is a great experience. I have learned a lot from the continuous exchange of knowledge and bridge preservation experience between the States, and how eager all members of the Partnerships are to share and to learn. I am getting to know bridge preservation and asset management practitioners from States, Industry, and Academia from the entire country. It is very rewarding for me to get them together on the phone, on the computer, or face to face.

The National TSP2 Bridge Preservation Conference took place recently in Orlando. This is a pivotal meeting that occurs every four years. Was the Conference successful? Did TSP2 reach its goals? Is there anything that fell below expectations?

The 2018 National Conference was a very successful meeting. We had over six hundred attendees, more than sixty exhibiting companies, of which thirty-one took part in the outdoor demonstration.

Florida DOT was an exceptional hosting partner who truly supported the Conference. They sent forty-one attendees who did a lot of work behind the scenes focusing on IT and the outdoor demonstrations.

Eighty different presentations were made in three separate sessions. (Note: See Related Links for the presentations’ videos at the bottom of the post).  All the independent Committees reached the common goal of making the 2018 Conference a great meeting. They should be praised for the excellent job they did.

A questionnaire that was sent to all attendees at the end of the Conference received very positive feedback

What could we have done differently? For the first time we had an App for getting information about the Conference and facilitating networking. It made it easy to anticipate the Agenda and take early decisions about which of the three concurrently running sessions to attend. The App was received very well to the point that I think we should have promoted it sooner.

How was the 2018 TSP2 National Bridge Preservation Conference different from the 2014 Conference that also took place in Orlando? What changed in these four years?

Compared to 2014, in 2018 we had much more interaction between the four Partnerships as well as between the States and Industry.

During the Working Group sessions, representatives from each Partnership were able to discuss what is being done, and also to open these discussions with other Partnerships and Industry representatives.  Key accomplishments reached by both the Regional and National Working Groups were shared among all participants.

At the 2018 Conference we also took the opportunity to highlight key presentations that were made over the last three years at the Regional Partnership meetings. Each of the Partnerships wanted to bring in these presentations so as to share them at national level. The four presentations were:

  • “MnDOT Bridge Maintenance Training for State and Local Agencies” by Sarah Sondag with Minnesota DOT (MWBPP);
  • “It’s Flooding Down in Texas – Lessons Learned from Seven Mass Flood Events” by Graham Bettis with Texas DOT (SEBPP);
  • “Preservation of Bridge Retaining Walls” by Ben Foster with Maine DOT (NEBPP);
  • “A Preservation Contractor’s Perspective: The Good and the Bad” by Kurt Clink with Truesdell Corporation (WBPP).

Is TSP2 planning to organize a third National Bridge Preservation Conference in 2022? Is TSP2 considering shortening the time between the National Conference meetings from four to two? Will the four Regional TSP2 Bridge Preservation Meetings remain in place in 2019, 2020 and 2021?

The next National Bridge Preservation Conference will take place in 2022.  We are looking for a host State, who can perform as well as Florida did for the two Conferences in 2014 and 2018.

We are not going to shorten the time between the National Conferences from four to two years because we want to have continuity at a regional level and make sure that the Regional Partnerships maintain a bridge preservation perspective. As an example, representatives from the Midwest Bridge Preservation Partnership who participated in the National Conference in Orlando in April 2018, will not meet again until October 2019, when the Regional Partnership Meeting is scheduled to take place in Bismarck, North Dakota. A year and a half between the two gatherings is quite a long time for the Midwestern bridge preservation representatives.

We want to have the Regional Partnership meetings on a regular basis since they are so valuable and popular.  We will therefore continue to have a Regional Meeting for each Partnership every year for three years in a row before organizing the National Conference.  This scheme has worked well so far for both the pavement and the bridge side.

Could you outline key programs for TSP2 Bridge Preservation, beyond organizing the Regional Partnership Meetings and the National Conferences?

The ongoing work of the Regional and National Working Groups is a crucial element of the TSP2 Bridge Preservation program.

National Working Groups address issues that are important to the four Regional Partnerships, who should always have a representative participating in the Groups. In most cases the National Working Groups have been created because a particular topic was already discussed at several of the Regional Working Groups. This happened, as an example, with the National Coating Working Group. There were already Working Groups focusing on coatings in the Regions, so it made sense to combine these Working Groups and generate a national effort.

We currently have five National Working Groups. These are the “Bridge Management System (BMS)”, the “Industry Technology Demonstration (ITD) Program”, the “Social Media Program”, the “Bridge Deck Preservation” and  the “Bridge Preservation Coatings” that I have just mentioned.

Additional National Working Groups have been proposed and are being considered.

As far as Regional Working Groups, the Midwest Partnership has four groups: “Outreach to Local Agencies”; “Systematic Preventive Maintenance (SPM)”; “Preservation Matrix” and “Deterioration Modeling”.

There are four Regional Working Groups in the Northeast Partnership: “Scour Working Group”; “Beam End Treatments”; “Bridge Washing” and “Research”.

The South-East Partnership has three Regional Working Groups: “Bridge Preservation Performance Measures”, Website Development and “Structural Health Monitoring”

There are four Working Groups in the Western Partnership: “Bridge Preservation Activities Matrix”, the “Quantifying a Systematic Preventive Maintenance Program”; “Research” and “Asset Management”.

As I said before, when the Regional Working Groups develop and find commonalities, they can evolve into National Working Groups.

A crucial part of the TSP2 Bridge Preservation program also entails promoting bridge preservation awareness to Local Agencies across the nation, such as Cities, Towns, and Counties. There is a lot going on as far as Local Agencies getting involved in bridge preservation. This should be of no surprise since Local Agencies own more than 50% of the bridges in the nation. It is therefore essential that Local Agencies be trained to properly maintain and preserve their bridges.

Three different initiatives have currently been put in place in order to improve Local Agencies’ involvement with bridge preservation policies and practices. The first entails the creation of a discussion group that focuses on networking with the objective to promote calls and meetings between States and Local Agencies. The second initiative involves the Western Regional Partnership that has established a Working Group about communicating the value of bridge preservation (Note: See Related Links about this Working Group at the bottom of the post). The Working Group is putting together modules for short presentations at Local Agencies and is looking for volunteers. The third initiative consists in the TSP2 Bridge Preservation training for Local Agencies that has been developed at NCPP. If a State is interested in gathering Local Agencies, NCPP@MSU can do half or full day bridge preservation training for them. We have an “a la carte” agenda where States and Local Agencies can pick and choose what they want to hear depending on their needs and capabilities.

It is likely that a National Working Group will be soon established about promoting bridge preservation to Local Agencies. FHWA has also an initiative in place focusing on Local Agencies to promote the value of bridge preservation.

All initiatives related to Local Agencies cannot use State’s funds contributed to the AASHTO TSP2 Program. While we must be careful regarding the extent of funding for these initiatives, there are remedial needs that the Partnerships can assist Local Agencies with.

Seasoned bridge preservation engineers, Pete Weykamp, retired from NYSDOT and John Buxton, retired from Maine DOT, are NCPP trainers. Since I have done some training myself, we currently have three bridge preservation engineers who can do the training for Local Agencies. We have already carried out training in several States and we are seeing more and more interest toward such training.

What is your vision for TSP2 Bridge Preservation?

I envision that the concept of bridge preservation will be fully understood and embraced by our bridge preservation community, and, at a different level, by the public. For this reason, the social media program is very important for TSP2. We certainly have a lot of room for bridge preservation to expand and social media is an excellent avenue to follow.

A correctly implemented bridge preservation policy can have a significant financial impact on our nation. This is the core message promoted by TSP2. Bridge preservation frees financial resources since it is certainly more economical to work on bridges in good or fair condition rather than on deteriorated bridges. In other words, Bridge Preservation is good for the economy.

The life of a bridge can be extended with a minimum cost if the right preservation action is taken at the right time. By doing so, States can focus more funds and resources on those bridges that are beyond restoration and need to have major rehabs or to be replaced.

Keeping most of bridges in “fair” condition appears to be a good means of managing our bridge assets. It is evident that we cannot keep all the bridges in “good” condition. This is sometimes a tough concept to accept. However, it is the reality. To have all bridges in good condition and to get there by only replacing the worst bridges cannot be regarded as a sustainable goal.

As I explained before, I envision a constant, gradual growth in the adoption of bridge preservations policies by the Local Agencies.

I would also envision our TSP2 Bridge Preservation representatives reaching out to representatives from other countries, especially Canada.

 

Related Links

TSP2 – Bridges:

https://tsp2bridge.pavementpreservation.org/

Videos of presentations at the 2018 Conference in Orlando:

https://www.youtube.com/playlist?list=PLnZiyLpQpiSergiRVkuVf6ljoRLjYhUKV

Working Group about communicating the value of bridge preservation established by the Western Regional Partnership:
https://tsp2bridge.pavementpreservation.org/western-wbpp/action-committees/.

Posted in Interview

A Manufacturer’s Perspective: Kwik Bond Polymers

Gregg Freeman, Business Development Manager with Kwik Bond

Author: Lorella Angelini, Angelini Consulting Services, LLC

Kwik Bond Polymers based in Benicia, California, is regarded as the largest supplier of polyester polymer concrete in the USA specializing in bridge overlays and concrete repairs. The company also offers thin epoxy overlays, High Molecular Weight Methacrylate (HMWM) concrete healer-sealers and High-Friction Surface Treatments (HFST), an innovative road safety countermeasure system.

To learn about Kwik Bond Polymers and its go-to-market strategy for bridge preservation, I spoke with Kwik Bond’s Gregg Freeman, Business Development Manager, and Merritt Hanson, VP of Sales.

What is your responsibility with Kwik Bond? When did you join the company?

Merritt Hanson, VP of Sales with Kwik Bond

Gregg: I joined Kwik Bond 6 years ago when I was approached by one of the founders of Kwik Bond after a presentation at a TSP2 Bridge Preservation Partnership meeting.

I work with the R&D Department for the development of new products, taking advantage of my 27 years of experience in the industry. I also work with DOTs in order to create specifications so as to be certain that contractors have proper information for installing our products correctly.

Merritt: I have been with the company for 12 years. My first experience with the polyester concrete technology took place in 2002 when I was with an overlay contractor. I met Kwik Bond founders at that time.  In 2006 they offered me a position as sales person in NY. I am now the VP for Sales focusing on the entire US market.

Can you speak of the evolution of Kwik Bond from a local company based in California to a  national competitor?

Gregg: The two founders of the company started working with Caltrans in the early 1980s.  At that time Caltrans was after “a more permanent solution” for concrete repair. As they decided to develop a new technology in partnership with the industry, they brought in industry experts who knew about polyester resins, methacrylates, and concrete construction. These experts became the founders of Kwik Bond Polymers. Once Caltrans started advertising the new technology for bid, they established Kwik Bond Polymers.  For a number of years Kwik Bond was both manufacturing polyester concrete and installing it. (Ed. Note: Nowadays Kwik Bond is exclusively a manufacturer. Kwik Bond works with local contractors for installations.)  The new polyester concrete technology has been managed well for many years in the State of California and it was well understood by Kwik Bond when the company decided to launch it nationally.

Merritt: Essential to the success of Kwik Bond Polymers is the fact that the polyester technology has proven that it works. The material bonds to the substrate, protects it over time and does not wear. Polyester technology simply does what it is supposed to do.

Kwik Bond has always taken care to verify that their materials are used in the proper manner to insure a correct application. This is also an important element of the success of Kwik Bond Polymers.

Can Kwik Bond be regarded as a successful example of collaboration between Agencies and industry?

Gregg: Yes, it has been a unique example of collaboration between an Agency and industry.  Caltrans did extensive research in the Lab and in the field by testing many different systems in search of technologies that could provide a solution to unique challenges.  At that time Caltrans had a large budget and highly skilled experts with a lot of freedom to push innovation to the limits, which also allowed them to bring in experts from industry.

Merritt: Once the polyester concrete technology was fully developed, Caltrans wrote specifications that were prescriptive and not so much performance-based.  Even though these specifications were functional to Caltrans’ needs, they could not tell everything about the material.  They informed about the individual components but the specifications did not underscore the interaction between these components, which is equally important. We were able to make the best use of Caltrans specifications because of our unique expertise with this technology.

Can you speak of polyester concrete? What are its primary applications and key properties?

Merritt: Polyester concrete can be used for a range of applications for bridge construction and preservation, first and foremost deck overlays, joint headers, concrete repair and regrading, such as building a wedge in approach slabs or overcoming extreme wheel path wear. For concrete repair applications you can pour up to 12 in. of polyester concrete in a single installation. I have actually poured up to 18 in.

Gregg: Polyester concrete has an exceptional resistance to wear. It is also completely impermeable thus preventing chlorides and contaminants from reaching the substrate. In comparison, high strength concrete has very low permeability but it is subject to cracking. It is well known that chlorides can enter even into very small cracks. This does not happen with polyester concrete. In the rare event a crack forms during a polyester concrete application, the crack does not grow. Then it can be easily and permanently sealed with a (HMWM) resin.

Merritt: I would say that the magic of Kwik Bond polyester concrete consists in the balance between its key properties, such as compressive strength, tensile strength and tensile elongation. You can actually boil it down to the balance between tensile strength and modulus of elasticity. At Kwik Bond we do not brag about exceptional properties of polyester concrete. Some competitors promote 20,000 psi compressive strength of their technology, but you actually do not want it. You want a balancing act: enough strength to keep the material from wearing and enough flexibility to handle the normal motions of a bridge deck. Kwik Bond polyester concrete provides this kind of balance. We therefore like to underline the correct balance of properties of polyester concrete, not its “high” something.  Let me underscore one more time that a carefully designed balance between key properties is at the core of the successful installations of Kwik Bond polyester concrete.

What about fast setting that allows quick traffic reopening?

Gregg: Fast setting is a very important Kwik Bond products’ feature, especially for polyester-based HFST applications. This technology allows return to traffic in 2 hours even in cooling conditions.

A key element for understanding why Polyester Polymer Concrete (PPC) provides such long-lasting installations is its thermal compatibility with the concrete substrate. Because Kwik Bond polyester concrete has such a large volume of aggregate relative to its resin, it has a good thermal compatibility compared, for example, to thin overlays, which expand and contract at a high rate. Our system is much closer to concrete than alternative solutions. It therefore reduces, or eliminates, thermal stress at the bond line.

Merritt: Certainly fast setting gets the attention, but the reason people continue to use our polyester-based concrete is because it works. It is a robust, forgiving material that works in a wide variety of cases, not just in niche conditions.

What are the challenges that you are facing in promoting this technology?

Gregg: People who are new to the technology tend to oversimplify it. Based on our success, they think that it is easier than it actually is.  They make mistakes that are detrimental to the good name of the polyester-based concrete technology.

Merritt: To me the biggest challenge is information. Despite the fact that polyester concrete technology has been used consistently  since 1983, it  is still new to a lot of people, who do not know what it can do for them and what it has done elsewhere successfully.

Materials that use resin as a binder are widely accepted nowadays, yet they are not gray or black, I mean they are not Portland cement-based or asphalt. These materials belong in a category of their own that it is still looked with diffidence by some people.  So for us the first challenge is to get the message across that our polyester-based technology does work. And even though there is no water/cement ratio to specify, the material can still provide successful installations.

What about the challenge of promoting this new technology to DOT Agencies?

Merritt: When I joined the company, Kwik Bond was working in just a few States in the West. Since I live in New York, I concentrated my efforts in the North East. I cannot tell you how unimpressed people were of the company’s success in California. The fact that the polyester technology had been used to overlay some of the biggest bridges in California was not really a factor. Breaking the barrier was very difficult. How did I go through it? I contacted DOT maintenance teams and did a lot of repair patches for free to show how the product works in the field.  I also met designers who trusted the technology and agreed to specify jobs. Engineers almost universally want to “kick the tires”. They want to see that the product works, even if it is on a small scale application. And I realized it early on.

Gregg: We took a small step approach. We found champions who were interested in bringing the technology forward.  With their help we put the product down and we started building a success story in almost each State. This strategy really works unless you find a State where a similar technology had failed in the past, or, even worse, had caused a safety hazard. It is almost impossible to enter such a State. Nobody wants to take the risk of adopting a technology that has a bad reputation, no matter how much the new technology is different from the one that had caused problems in the past and proved to be successful.

It seems that overcoming bad reputation is an important issue in dealing with DOTs.  Is this a challenge for Kwik Bond?

Merritt: This is really a big challenge for Kwik Bond. Since people think that polyester concrete technology is easy, there are occasionally contractors or suppliers that try to piece the system together. Unfortunately, there is more to it than what they see initially.  It is not so easy to provide long-term preservation and an outcome that has been proven over time.  Just because someone claims to meet the specs, it does not mean that the material will be able to perform over time.  Symbolic goods are not equivalent to the real thing.

Polyester concrete is an engineered composite system where the single components need to be compatible in order to work together properly. The system is certainly more than purchasing a series of ingredients and mixing them in the job site. It does not work in that way.

When a polyester concrete mix is put together by people who do not have  adequate expertise and knowledge, applications can go poorly. This can give a bad name to the technology thus disrupting what we have built. For this reason, we have had to overcome reputation problems in a number of States. Typically somebody else comes in, tries to do what we do, and does it so poorly that all brands of polyester concrete, Kwik Bond included, can be banned for years.

Our way to go to market is to control applications and avoiding overselling. We only sell when we are sure that the product is the right solution. For this reason we are reluctant to sell through distribution and we prefer selling directly to contractors

Gregg: Polyester concrete is essentially a mix of two blends of aggregate and the resin. Kwik Bond Polymers specifications say that there should be a preliminary research showing that the components are compatible when mixed together. Very few people understand the meaning of this requirement. Formulations are thrown on the market without properly testing the compatibility of the ingredients.  This does not happen with Kwik Bond Polymers since we have an unmatched level of knowledge and experience with polyester concrete technology.

 

LINKAGE

Kwik Bond Polymers website

http://www.kwikbondpolymers.com/

FHWA LTBP Summary—Current Information on the Use of Overlays and Sealers

http://www.trb.org/Main/Blurbs/176789.aspx

 

SEBPP 2017 Presentation: Polyester Polymer Concrete Overlays in North Carolina

Posted in Interview

A Conversation with John Buxton, Bridge Maintenance Engineer at Maine DOT

John Buxton with Maine DOT

Author: Lorella Angelini, Angelini Consulting Services, LLC
I recently spoke with John Buxton, Bridge Maintenance Engineer / Deputy Chief Engineer at Maine DOT.  He is in charge of the Bridge and Structures Maintenance Division at the Bureau of Maintenance and Operations. In addition, he is connected to the executive office as the Deputy Chief Engineer. John is fully committed to bridge preservation. His many years of experience in this field make him a go-to person with TSP2.

What does bridge preservation entail at Maine DOT?
Bridge preservation currently represents 70% of Maine DOT’s maintenance budget. While in the past we used to do a lot of rehabilitation and restoration type of work, currently preservation is the primary focus for the maintenance department. Preservation entails activities such as replacing and repairing joints, making sure that all joints are sealed, sealing concrete with water repellents, painting bearings and beam ends, and keeping concrete wearing surfaces in good condition. We are trying to address the deterioration of bridge elements before it becomes a problem. It is evident that it is better to spend a few dollars in preservation than thousands of dollars in restoration.

Does your 70% of maintenance budget include all preservation expenditures at Maine DOT?
In addition to maintenance, also the capital side has a budget for preservation activities, which mainly entail full painting projects. We are treating concrete with silanes, not only the deck but also vertical surfaces, such as piers adjacent to travel ways, back walls, and all exposed concrete.

The capital money is obviously not as aggressive in preservation as maintenance money. The capital side probably spends 25 – 30 % of their funds in preservation while the rest is reconstruction and bridge replacement.

Getting the capital people, who focus on new bridge construction, to invest funds on preservation activities has been a major shift in the way Maine DOT operates.  It is a combination of preservation, construction and reconstruction that allows maximizing investments for the bridge infrastructure.

What are the key points of the bridge preservation strategy at Maine DOT?
Our main strategy is to keep bridges in good condition by doing preservation activities. We are getting out of the “worst first” type of mentality, even though we continue to take care of bridges that are deteriorated beyond the practical maintenance point.

If you talk with other representatives from the TSP2 Bridge Preservation Partnership, you will find that they are using the same approach.

Do you have any statistics that show the benefits of a bridge preservation strategy?
The benefit of preservation is probably one of the hardest things to capture. For example, when you seal concrete it is hard, almost impossible to predict, whether the concrete is preserved for 20 or 25 years. In terms of NBI Bridge Inspection Ratings, when you seal the concrete of a pier, you do not change the rating of the pier. Let’s say the pier is in a condition state 6. By sealing the concrete you hopefully have kept the pier in that condition state for a longer time, which does not show up in graphs or statistics. It is really difficult to quantify the benefits of preservation actions.

Is it challenging to convince people of the benefits of preservations?
Yes, building a new bridge always carry the headlines. However, the political flavor has changed in Maine and around the Nation. People understand that it is worth preserving bridges, especially when they see the tremendous cost for a new bridge. Spending a fraction of that cost to do actions that can preserve an older bridge and get 30 – 40 more years of life out of it is evidently the proper way to go in most cases.

What are your goals with bridge preservation?
In line with the National Highway System guidelines, our primary goal is to eliminate all condition 4 , corresponding to poor condition, for bridge elements.  However, our goal is not only based on numbers but also on a case by case evaluation. Let’s say that we have an abutment that is in a condition state 4. It does not mean that the abutment is unsafe. It just means that the abutment is not in a good condition. It may have been in that condition for 20 years and it may be able to provide another 10-15 years of service life in that condition. Sometimes it is necessary to be aggressive on a bridge element, sometimes not.  What is important is to evaluate the impact of the element on the functionality and the safety of the bridge.

Can I say that that you are in favor of a selective approach?
If you just look at numbers, they are pretty sterile; they do not tell you the whole story. It takes skilled, talented, knowledgeable professionals within each State Agency to evaluate risks related to the condition state of bridge elements. To be able to quantify and qualify these risks is a key knowledge that ultimately keeps public safe.

You do not want to spend funds just to make the numbers look good.  You want to do the right thing for your bridge inventory.  If you can postpone expenditure for 15 years without jeopardizing safety and function, then this is the right thing to do in my opinion.

Who takes decisions related to bridge elements at Maine DOT?
We take decisions in a bridge committee that comprises of three legs: bridge maintenance, bridge design and construction, the so called capital program, and bridge management. It is what we call Maine DOT’s bridge community.  We know each other. A lot of us have worked together for as long as 30 years.

I am also part of a posting committee at Maine DOT that takes decisions on bridge weight restrictions. If a bridge does not meet a certain level of capacity based on bridge ratings, we evaluate whether we post the bridge or we strengthen it. In some cases, we do research, such as load testing, cutting coupons out of the steel to see if it is still strong, or cutting reinforcement steel in concrete to see strength can be added.

Some posting can be restrictive thus impacting community and commerce.  Bridges in rural areas usually need fewer restrictions since they just carry fire trucks and light vehicles. Even though many bridges in Maine are in good condition, they were designed 60 years ago for a much lighter type of vehicles.  Over 50% of Maine bridge inventory is more than 50 years old.

We spoke of the challenge of making people aware of bridge preservation benefits. Are there other major challenges?
The availability of experienced, qualified workers is another major challenge for bridge preservation. Craft people are not readily available as they once were. This challenge is not peculiar to Maine but rather a nationwide issue.

Do you do in-house maintenance work?
Two years ago Maine DOT started contracting maintenance jobs out. We had more money for maintenance than in the past but not enough people to do the job. We therefore decided to contract out using those additional funds. It was a little clunky at first because we had never contracted jobs out before.  The capital department had always done all the contracting for bridges at Maine DOT. We had to learn how to put out contracts and they are small contracts, generally under $200,000.

With the increased funding, do you have enough money for all preservation work at Maine DOT?
In 2007 and 2014 we developed two reports called “Keeping our Bridges Safe” (see Linkage – Ed. Note). Those reports recognize the need of spending $140 M/year for bridge preservation. However we get on average $105 M/year. As a result of being we remain $30 – 40 M/year short of spending requirements, at Maine DOT we are accumulating a spending deficit of $90 – 120 M in the length of time of 3-4 years.

Is there any bridge preservation success story you would like to share?
I think our biggest success story is that the entire bridge community at Maine DOT is on board with bridge preservation and really sees the value of it.

Painting may not improve the NHS condition rating of a superstructure, sealing concrete may not improve the NHS condition rating of a substructure; however these are important actions to keep bridges in a good condition. As an analogy, regularly changing the engine oil does not modify the way one drives a car but it makes a big difference in the longevity of the cars’ engine.

Does TSP2 assist you in reaching your bridge preservation goals?
I remember when Ed Welch from New Hampshire DOT, Pete Weykamp from New York DOT and Everett Barnard, my predecessor at Maine DOT, used to meet in New Hampshire with maintenance personnel. These three people first recognized the need for bridge preservation to have its own forum. So my hat goes off to them for pushing the preservation idea and setting up the conditions for having the Partnerships.

To me every year TSP2 Bridge Preservation meetings are better. Communication between bridge preservation practitioners is improving and we have more proficient people representing manufacturers. I can call up a number of engineers that are part of the Partnership and ask: have you tried this? Have you got this problem? What do you do to solve it? The network is just phenomenal.

There is a great value for bridge preservation practitioners to connect with product manufacturers’ people at the TSP2 Bridge Preservation Partnership meetings. Bridge practitioners can speak with different manufacturers and compare their products. There is also an opportunity for competitors to confront their products. Manufactureres also have avenue where they can speak with each other and potentially start collaborations for putting together different products and technologies in order to solve bridge preservation problems. TSP2 sets the stage for creating synergies between product manufacturers.

 

LINKAGE

Maine DOT
http://maine.gov/mdot/

“Keeping Our Bridges Safe” 2007
http://www.maine.gov/mdot/publications/docs/plansreports/Keeping%20Our%20Bridges%20Safe.1107.pdf

“Keeping our Bridges Safe” 2014
http://digitalmaine.com/cgi/viewcontent.cgi?article=1083&context=mdot_docs

Posted in Interview

Reports from the MWBPP Working Groups

Author: Lorella Angelini, Angelini Consulting Services, LLC

At the recent TSP2 Midwest Bridge Preservation Partnership (MWBPP) meeting that took place in Minneapolis, the Working Groups met to discuss the status of their activity and outline future developments.  I asked the leaders of the Working Group meetings in Minneapolis if they could write a summary for the Blog.

Preservation Matrix: Dave Juntunen, Michigan DOT

Dave Juntunen with Michigan DOT

The working group concurred that the preservation matrix is still desired and the working group should be continued. New members volunteer.

The current deliverable of the working group is an Excel spreadsheet showing what preservation activities the partner states do by contract and state maintenance forces. Unfortunately few people ever see the matrix or even know of its existence. The group would like to update the matrix and make it available to the bridge preservation community by placing it on the on the TSP2 MWBPP website. The matrix should be updated to include links to training and state specifications. Analysis of the matrix can be done to show trends in preservation and a blog written to introduce the website and provide outreach to partner states and local agencies.

Systematic Preventive Maintenance (SPM): Scott Stotlemeyer (chair), Missouri DOT

Scott Stotlemeyer with Missouri DOT

25 attendees met to discuss the current and future scope and deliverables of the MWBPP’s Systematic Preventive Maintenance (SPM) working group.   The working group serves to collect information regarding member states’ status in having an FHWA-approved SPM program.  The working group delivers a synthesis of member states’ participation in a program and any SPM-related information (e.g., contacts, agreements, guidelines, etc.) they are willing to provide on a triennial basis.  The last of which was released in November 2016 and is available through a link on the “MWBPP Working Group” page of the TSP2 Bridge Preservation website.

Those in attendance agreed the working group’s scope and deliverable were still relevant, as some member states were still working on developing or improving their SPM program and the information provided was of benefit to them.  In addition, attendees expressed their interest in a list of potentially eligible SPM activities – possibly ones preapproved by FHWA for inclusion in an SPM program.

Additional discussion within the group involved guidelines, processes, and equipment used to perform SPM activities with in-house forces and specifications for performing SPM activities through contract under an SPM program.

Deterioration Modeling: Fouad Jaber (chair), Nebraska DOR

Fouad Jaber with Nebraska DOR

12 people attend the working session.  The discussion went in the direction of continuing this effort.  Fouad will contact member states to find out their practices and needs for deterioration models.  We may create a pooled fund to address MWBPP State needs and bridge the gap between BrM and states practice. A survey will help focus the effort to what is needed.  The National efforts (BRM and LTBP) as well as individual state tools will be considered.  Hooman (Rutgers) from the LTBP will help with access to the LTBP Portal.   The survey will also identify the appropriate person in each state that we should coordinate with.  We may use pooled fund to reduce the data.  There will be a conference call in near future with Working Group to set up the survey

 

LINKAGE:

https://tsp2bridge.pavementpreservation.org/midwest-mwbpp/action-committees/

Posted in General, General News, News

A Conversation with Judith Corley-Lay

Judith Corley-Lay, Director of NCPP

Author: Lorella Angelini, Angelini Consulting Services, LLC

In April 2017 Judith Corley-Lay took the leadership of the National Center for Pavement Preservation team thus succeeding to Larry Galehouse after his retirement.  Judith comes to NCPP and TSP2 with an impressive track record.

She started her career teaching Civil Engineering at the University of Texas in Arlington focusing on geotechnical engineering, contactor specifications and engineering economics. After several years with the University of Texas, she joined Texas A&M (Agricultural and Military) where she thought for two years and was also appointed to the staff of the A&M Transportation Institute. When her husband took a position at the University of North Carolina, she relocated to North Carolina, where she started working in the pavement management unit at North Carolina DOT (NCDOT).  For 26 years, up until her retirement in September 2016, she developed an extensive knowledge of pavements, including design, data analysis, field data collection, and pavement management systems.

When Larry Galehouse left the National Center for Pavement Preservation (NCPP), she decided to step out of retirement and apply for his position. She is now employed by Michigan State University (MSU), working from North Carolina where her family lives.   When I asked her about the decision to apply for the position as Director of NCPP, she told that it came from the realization of the great value of the TSP2 Partnerships, her desire to continue their activity and contribute to their success. In her work at NCDOT she has had first-hand interaction with the South-East Pavement Preservation Partnership (SEPPP) that brought her a huge amount of benefit.

Can you speak of the challenges of continuing the job started by Larry Galehouse?

When you are taking over from somebody like Larry, who had led an organization from the beginning, it is a daunting task. While I know a lot about pavement preservation, I am putting a lot of emphasis on becoming knowledgeable in the areas of bridge preservation and equipment management. For this reason I made the commitment to attend every Partnership meeting for at least first year. This allows me to learn first-hand about how the different groups work.  

Michigan State asked me to increase the research activity for bridges, pavements and also equipment. In collaboration with John Hooks, who is an excellent writer and editor, we wrote a proposal for accelerated bridge preservation for Michigan DOT. The proposal was accepted. This, was really good because (NCPP) had not had any research for Michigan DOT in several years.

One of the complications of my job is that you really have to balance the activities the Partnership focuses on with the activities from the University and the Oversight Panel. These activities are not always coincident.

What can you tell about the activity from the Oversight Panel?

The Oversight Panel is chaired by George Conner from Mississippi DOT, who is also the chair of SCOM, Sub-committee on Maintenance. The Oversight Panel represents AASHTO in overseeing the TSP2 program by NCPP. We answer to AASHTO that legitimately wants to know how expenditures into the program are being used.

During the last session the TSP2 Committee came up with the idea of funding small research projects with the Partnerships. While half of TSP2 excess balance is used for future operations, TSP2 wants to spend the other half on operations related to activities through the Partnerships. We are going to ask the Partnerships to submit research ideas. Then a few of these ideas will be chosen and funded to the level of contribution already submitted by the States.

Excess fund comes from the States’ voluntary contributions to TSP2. These contributions fund two people to come to the regional Partnership meetings for both pavement and bridge preservation. A little carries forward every year thus building up an excess fund that we want to spend down doing research for the Partnerships.

NCPP is a Center at MSU. I have an appointment to the faculty of MSU even though I do not teach. NCPP is under contract with AASHTO to manage the TSP2 program, which includes all of the Partnerships for both pavement and bridge preservation. That is how everything is linked. One of the reasons NCPP was chosen by AASHTO is its ability to develop good relationships between the vending community and the Agencies.

TSP2 has indeed created a strong dialogue between state DOTs and vendors that was almost unthinkable some time ago. Could you comment about it?

TSP2 has been successful and innovative in establishing a relationship between Agencies and vendors, such as manufacturers, contractors and consultants.

Partnership meetings are set up with specific guidelines about the conversation cannot be about any project up for bid. This fundamental rule makes it possible for State agencies to talk with the vending community and have a really good conversation. You hear people talking: “What about this type of application?” or “I tried this, I had this problem, what do you suggest?” These conversations could not take place if they were related to contract projects.

Going back to your TSP2 appointment, could you provide some details about what your job responsibility entails?

I am focusing on three areas. One is overseeing the day by day operations, making sure that routine operations run smoothly. Another area concerns the development research programs, as I explained before. The third focus area, which is very important for me, entails increasing the activity with local Agencies, such as Counties, Municipalities, and Cities.

I recently spoke at the American Public Works Association (APWA) for the North Carolina chapter and at the asset management conference through the Michigan Local Technical Association Program (LTAP) in order to promote the concept of preservation and increase contacts between TSP2 and local Agencies.  

It is important to promote the preservation message. We should underscore the advantages that preservation brings to the community starting from tax dollars savings, especially in the long-term.

Spreading the preservation message also keeps the new leadership at state and local Agencies informed and knowledgeable about preservation. Agencies turn over leaderships every 4 years on average, which means that they are always in a training mode at some level.

What is your vision for bridge preservation?

Agencies must move beyond the Structurally Deficient (SD) bridge concept as they define their plan of action. If Agencies only focus on repairing or replacing SD bridges, there will likely be a huge wave of bridges moving from fair conditions to SD in the near future.  

Unfortunately, the MAP-21 legislation retained and amplified the focus of DOT Agencies on SD bridges since FHWA took SD as the measure for bridge performance in MAP 21 legislation. Definitively, focusing investments solely on SD bridges is not a sound strategy.

I think that focusing on SD bridges also leads the bridge preservation conversation in the wrong direction.

We have a great talent pool in the bridge preservation area. Practitioners are knowledgeable and passionate about their work. They know their inventory and they understand what it takes to keep the inventory working but we cannot give them value as long as SD remains the key topic.

Could you point out key challenges for bridge preservation?

As I said before, MAP 21 and its focus on SD bridges is a challenge. Another significant challenge entails the very large number of retirements that are happening at the state Agencies. Gap in experience is developing not just in the Agencies but also in the contractor community.

After the completion of the Interstate highway expansion in the 90’s, for approximately a 15-year period there was not much hiring. When people in their 60’s with 30 years of experience are now retiring, we replace them with people who have only 15 years of experience. There is a 15-years gap, which is huge in bridge preservation because preservation requires experience. Its knowledge is based on seeing problems and trying solutions. In spite of knowledge sharing at the Partnerships, it is only after a decision is played out in practice that one can know if it was correct or no.

This is not a reflection on the younger generation that is sharp and bright. I have a lot of faith in the younger generation given they have the time to develop some expertise. I am confident they will be able to move the bridge preservation issue to another level.  

What gives you the most satisfaction in your work?

There are two aspects of my work that I find most satisfactory. One is coming to the regional Partnerships meetings and hearing bridge practitioners being so honest about strengths and weaknesses of their program. They are inspiring with their honesty. The other aspect is of course the staff at the NCPP, who are wonderful people I enjoy working with. I respect their level of commitment. They really want everything to be perfect, which makes my job a joy.

LINKAGE:

APWA North Carolina Chapter
http://northcarolina.apwa.net/

Michigan LTAP 
https://michiganltap.org/

Posted in Interview

A Conversation with Kevin Irving with AZZ Metal Coatings

Kevin Irving with AZZ Metal Coatings

Author: Lorella Angelini, Angelini Consulting Services, LLC

Steel corrosion tops the list of bridge preservation problems. It shortens the service life of bridges and can pose a safety issue. Once corrosion has started, it is very difficult, almost impossible, to stop it. In the US 40% of carbon steel is used to replace corroded steel at a cost of $425 B corresponding to approx. 2.5% of the GDP. This cost does take into consideration the additional cost related to suspending or limiting the use of steel damaged infrastructures.

Galvanized steel is being iincreasingly adopted by DOTs as a mean to protect structural steel from corrosion. To know more about this growing technology I spoke with Kevin Irving, National Marketing Specialist with AZZ Metal Coatings.

Kevin, who is based in the Chicago area, has more than 25 years of experience in the Hot-Dip Galvanizing (HDG) industry. He has many qualifications, such as being a certified coating inspector by the NACE International and a certified presenter of the American Galvanizers Association (AGA). He currently serves as a National Board Member for the Chemical Coaters Association International (CCAI) and as a member of the TRB Bridge Preservation Committee. He is industry director for the Western and Midwest TSP2 Bridge Preservation Partnerships.

What are the benefits of HDG for bridge preservation?

HDG increases bridge safety while reducing maintenance costs. It consists of applying a protective zinc coating to steel thereby preventing rusting and deterioration of the steel. Since zinc corrodes up to 30 times slower than steel, galvanizing dramatically reduces steel corrosion. Zinc adheres to steel through the metallurgical bond provided by HDG.

What are major differences between galvanizing and other technologies for steel protection, such as metalizing and painting?

Galvanizing, metalizing and zinc-rich paints all provide barrier protection to the underlying steel. What separates galvanizing from the other two technologies is the fact that galvanizing provides a metallurgical bond between zinc and steel, creating three zinc-iron alloy layers and a nearly pure zinc outer layer. Instead, metalizing and paints provide a mechanical, not a metallurgical bond, between coating and steel. The mechanical bond is generally considered as a less performing bond when compared to the metallurgical.

All three technologies provide cathodic protection to the underlying steel although some types of zinc-rich paint provide less protection than others. If the coating gets scratched thereby exposing the steel, the zinc will preferentially corrode to protect the exposed area. HDG has the advantage of preventing scratches in the first place. In fact, the zinc-iron alloy layers created during galvanizing are harder than the base steel, making HDG much more abrasion resistant than other coatings.

Can HDG be considered an innovative technology?

HDG is a very good technology with an exceptional track record but it cannot be considered as an innovative technology. Some applications like the I-69 bridge northbound lanes near Indianapolis, the Stearns Bayou Bridge in Grand Haven, Michigan and the Ford County Bridge in Illinois were completed almost 50 years ago.  These three bridges represent a success story since no maintenance has been needed to date and another 30 years of service life should be expected for all of them.

Continuous-Galvanized Rebar (CGR) per ASTM A1094 produces a galvanized rebar with a pure zinc alloy coating structure.  Although the continuous galvanizing process has been used for decades on galvanized automotive steel, its application to rebar is new. The CGR process allows long lengths of rebar sizes to be stored for fabrication and then formed without cracking, peeling or flaking, and without requiring special equipment for forming.

The CGR coating passivates faster and corrodes at a slower rate than traditional HDG coatings. The CGR process is automated and faster, resulting in quicker lead times, repeatable quality and consistency in the coating.

CGR can also be dual-coated with epoxy to produce a duplex coating according to ASTM A1055 specification.  The additional epoxy barrier over CGR provides an affordable belt and suspenders approach for most extreme environments.

Is galvanizing an expensive technology?

According to Philip G. Rahrig, executive director for the AGA, the cost for HDG is approximately $1.76 per square foot. This cost should be slightly less for large tonnage jobs.

What are the fields of application of galvanizing technology?

The technology is widely used for steel structural elements, such as beams and rebars in reinforced concrete. It is also used for guard rails, street signs and posts.

Could you briefly describe the galvanizing plant process for a steel beam, for example?

In the HDG process, the steel beam comes to the galvanizing plant after being manufactured and prior to service. The first step of the process entails an inspection to check that no paint, mill markings and heavy grease are present on the steel surface. After the inspection the beam goes to a caustic degreasing bath to remove any grease, grime, oil, or dirt. Once rinsed in a water bath, the beam is immersed in an acid tank or pickling bath so as to remove of any mill scale or rust oxide. This is also followed by water rinsing.

After cleaning, the steel beam is immersed in a flux tank. The flux is a combination of zinc, ammonium and chloride. At 160 degrees Fahrenheit, the flux bath deposits a light coating on the steel, which keeps it from oxidizing. The flux bath also preheats the steel.  In the next and final step of the process the beam is submerged in a galvanizing kettle. This bath must have a minimum of 98-percent pure zinc to meet ASTM A123 requirements.

The galvanizing kettle is heated to a temperature ranging from 830 to 840 degrees Fahrenheit, at which point the zinc is in a liquid state. The steel beam remains in the zinc bath until the steel reaches the bath temperature. When the beam comes out from the kettle, the zinc coating must have a minimum thickness of 3.9 mils for steel more than 1/4-inch thick (ASTM A123).

It usually takes approximately three hours to complete the process from beginning to end. The steel is typically immersed in the molten zinc in the galvanizing kettle for less than 10 minutes. There are currently more than 75 plants in the United States that can provide galvanizing for steel elements for bridge construction.

What are the challenges in the HDG process and the steps to ensure it is properly done?

It is extremely important to check placement and number of vent and drain holes prior to the galvanizing bath. This ensures safety during immersion of the steel in the molten zinc by allowing pressure to escape from air and moisture present in internal sections of fabrications. It also allows the molten zinc to contact and form the HDG coating on all internal and external surfaces. Vent and drain hole requirements are outlined in ASTM A385.

It is also preferred that the piece is completely fabricated before being galvanized so as to avoid welding after the galvanizing process.  If welding is needed after HDG, the zinc must be burnt off with a torch or ground off until there are sparks in order to be sure that the steel substrate is reached.  Upon completion of welding, it is necessary to restore corrosion protection on the area where the galvanizing was removed and on the weld.

It is good practice to communicate with the galvanizer prior to design and fabrication. This provides the best opportunity to address design details that could affect the formation of the HDG coating.

Can you share a case study?

The Stearns Bayou Bridge in Grand Haven, Michigan, was galvanized and installed in 1966. The steel is in very good conditions without having required any maintenance from the time of construction.

This county bridge is 430 feet long with a 30-foot clear roadway and a 5-foot walkway along each side. The majority of the steelwork is 6 feet above a freshwater river in a rural location. The bridge experiences light to moderate traffic and the entire bridge is subject to winter salting.

After 51 years following the construction, all the beams and diagrams are in very good shape showing no signs of rusting or staining despite the fact that the bridge is subjected to snow and deicing salts. The average zinc coating thickness is 5.4 mils, which indicates that HDG will continue to provide corrosion protection for decades in this environment. All bolted connections also show no signs of rust.

However, in five places on the tubular rails on the top of the bridge there are signs that the zinc has been completely consumed thus exposing the metal substrate. The preservation process for these areas simply requires applying a zinc rich paint over the exposed steel.  The rest of the rails should be power washed with some type of salt mediation and painted over without sandblasting on a completely dry surface. Standard specifications (ASTM D6386 and SSPC Guide 19) must be used as guidance for the paint application.

 

LINKAGE

AZZ Metal Coatings https://www.azz.com/metalcoatings

You Tube video from AGA: “Hot-Dip Galvanizing: Protecting Steel For Generations” https://www.youtube.com/watch?v=kwCyq06aatA

You Tube video from GalvanizersAssocAus: “Hot Dip Galvanized Steel – What, How & Where” https://www.youtube.com/watch?v=c2J07n5hSbs

You Tube video: “AZZ Galvanizing Overview”
https://www.youtube.com/watch?v=CNukOte3tSU

You Tube video: “AZZ Galvanizing Workflow”
https://www.youtube.com/watch?v=YVWgGYGEer4

Posted in Interview

A Conversation with Jeffrey Milton with VDOT

Jeffrey Milton with VDOT

Author: Lorella Angelini, Angelini Consulting Services, LLC

Jeffrey Milton, Bridge Preservation Specialist with Virginia DOT (VDOT), is a bridge preservation leader in his State and at national level.

Jeffrey is member of the AASHTO Subcommittee on Maintenance chairing the Technical Working Group on Bridges. He is also part of the FHWA Bridge Preservation Expert Task Group and actively involved with TRB and NCHRP, where is covers a number of Committee Memberships.

  • TRB Standing Committee on Structures Maintenance – AHD30 Member
  • TRB Standing Committee on Bridge Preservation – AHD37  Member
  • NCHRP Project Panel on Development of Guidelines for Uniform Service Life Design for Bridges D12108  Chair
  • NCHRP Project Panel on Condition Assessment of Bridge Post-Tensioning and Stay Cable Systems Using NDE Methods D1428  Member
  • NCHRP Project Panel for Extending the Life of Highway Bridge Coating Systems Through the Use of Spot Painting with Minimal Surface Preparation D1430  Member

Jeffrey is a member of the FHWA Technical Panel for update of NHI Bridge Maintenance Training Course and development of NHI web-based Bridge Preservation Training Course. He is also member of the TSP2 oversite panel.

I recently had the opportunity to speak with Jeffrey about VDOT bridge preservation program.

How does bridge preservation fare at VDOT?

Using Virginia structure data as of September 1, 2017, the total number of structures in Virginia inventory sums up to 21,124, of which 13,113 bridges and 8,010 culverts. Out of these structures, 19,469 entail VDOT owned/maintained structures, of which 11,910 bridges and 7,559 culverts. The number of city, county and town owned/maintained structures is 1,463, including 1,044 bridges and 419 Culverts

VDOT defines Condition Categories for structures as Good, Fair and Poor.

  • Good Condition means a low General Condition Rating of 6 or greater
  • Fair Condition: a low General Condition Rating equal to 5
  • Poor Condition: a low General Condition Rating of 4 or less

Condition Categories for the 19,469 VDOT Owned/Maintained structures currently report a limited number of structures in Poor Condition.

  • 13,891 (71.3%) of the structures are in Good condition
  • 4,818 (24.7%) of the structure are in Fair condition
  • 760 (3.9%) of the structures are in Poor condition

What does bridge preservation entail at your DOT?

At VDOT bridge preservation is part of a comprehensive Bridge Program that includes preventive and restorative maintenance, painting, rehabilitation and replacement.

Examples of preventive maintenance are bridge cleaning, deck sealing, sealing joints, thin deck overlays and spot and zone painting.

Restorative maintenance includes deck patching, rigid deck overlays, reconstructing/closing joints, superstructure repairs, substructure repairs, fatigue retrofitting, scour repairs, cathodic protection and electrochemical chloride extraction.

Painting encompasses spot and zone painting, over-coating, complete removal and repainting.

Superstructure replacements, deck replacements and culvert rehabilitation are examples of rehabilitation. Rehabilitation and replacement are not part of VDOT Bridge Preservation Program, which focuses exclusively on preventative maintenance, restorative maintenance and painting.

What criterion does VDOT use to determine actions that should be implemented?

Our criterion can be outlined in three points.

  • Preventive maintenance candidates are structures in Good Condition (a low General Condition Rating of 6 or greater)
  • Restorative maintenance candidates are structures in Fair Condition (a low General Condition Rating equal to 5)
  • Rehabilitation and replacement candidates are structures in Poor Condition (a low General Condition Rating of 4 or less).

We also use element level condition states and defects to develop specific maintenance and preservation treatment options.  We previously used AASHTO Pontis for our bridge Management system, and we are now investigating the use of AASHTO BrM.

As a general guideline, we want to make sure that preventive, painting, and restorative works are performed before the onset of serious deterioration while the structures are still in good or fair conditions.

We adopted a breakdown for the allocation of bridge structure funds that foresees 15% for preventive maintenance, 10% for painting, 25% for restorative maintenance and 50% for rehabilitation / small structure replacement. This balanced breakdown helps select efficient and effective actions, as it is essential in order to maintain a healthy bridge structure inventory.

Can you outline key bridge preservation strategies at VDOT?

Some VDOT structure/bridge preservation strategies include:

  • Eliminate deck expansion joints. The designer must evaluate the feasibility of joint elimination. When elimination is not possible, the designer will have to submit justification, including supporting calculations, to the Assistant State Structure and Bridge Engineer for Maintenance.
  • Reconstruct concrete adjacent to joints and install strip seals. When joints cannot be practically eliminated, specific activities should be performed such as perform concrete substructure surface repair and apply waterproofing coating/treatment to pier and abutment seats and ends of beams/girders.
  • Install asphalt plug joints with back-up sealers on decks having asphalt overlays.
  • Prepare concrete decks using hydro demolition and place rigid concrete overlays.
  • Coat beam ends and substructure caps under joints.

What challenges have VDOT encountered in the implementation of bridge preservation strategies?

Like many Agencies, our corporate culture has previously taken a worst first approach to the bridge program, with major emphasis on structurally deficient structures.  We have made great progress with our management in promoting a preservation approach focusing on preventive, painting, and restorative works for extending the service life of our inventory.

Can you inform of new technologies that have been recently adopted by VDOT?

We have started using hydro demolition and placement of rigid concrete overlays to protect the concrete deck. We are also investigating the use of hydro-demolition and hydro-milling for concrete removal on substructures.

VDOT Structure and Bridge Division and the Virginia Transportation Research Council are investigating the use of remotely operated data gathering devices and remotely operated maintenance devices. These devices, which include Microsoft HoloLens, unmanned aerial vehicles (drones) and crawling devices designed for bridges and culverts, can be outfitted with various sensing technologies, such as infrared, high resolution cameras and impact (sound).

We are in the process of conducting a research project in order to investigate the use robotic devices in conjunction with lasers for the removal of paint from steel beams and girders.

How can TSP2 help VDOT reach its goals?

TSP2 provides a very valuable platform for sharing information of treatment methods, best practices and research projects among the States, especially when participating in regional and national working groups.  The TSP2 staff provides support to the preservation program in Virginia and throughout the nation.

 

LINKAGE

Chapter 32 of the VDOT Manual of the Structure and Bridge Division (File 32.01-9-12) shows the VDOT Bridge Planned Preventive Maintenance Program.  A link to this document follows: http://www.virginiadot.org/business/resources/bridge/Manuals/Part2/Chapter32.pdf

VDOT is in the process of reviewing and updating this document (Ed Note).

A link to the FHWA Bridge Preservation Guide follows: https://www.fhwa.dot.gov/bridge/preservation/guide/guide.pdf

This guide will be updated by the FHWA Bridge Preservation Expert Task Group (Ed Note).

Posted in Interview

Emphasis on Case Studies at the MWBPP Meeting in Early November

Author: Lorella Angelini, Angelini Consulting Services, LLC

Bridge preservation case studies will be featured at the 2017 Midwest Bridge Preservation Partnership (MWBPP) meeting held at the Marriott City Center in Minneapolis, MN on November 6-8. The meeting will also focus on actions for deck and joint preservation and emergency response procedures for exceptional events, such as flooding, bridge hits and fire.

Bridge preservation practitioners attending the meeting represent the States that are part of the Midwest TSP2 Partnership region: Illinois, Indiana, Iowa, Kansas, Kentucky, Michigan, Minnesota, Missouri, Nebraska, North Dakota, Ohio, Oklahoma, South Dakota and Wisconsin. At the meeting preservation practitioners from DOTs and other owners will be interacting with contractors, consultants, academia and manufacturers that have a stake in bridge preservation in the Midwest region. Manufacturers will also have an opportunity for showcasing their products and technologies.

As with all TSP2 Bridge Preservation Partnership meetings, time will be dedicated to round tables where owners, consultants, academia, manufacturers and contractors can exchange information related to their experience with bridge preservation, underscoring challenges and solutions for extending the service life of concrete and steel bridges.

MWBPP mission is to provide a platform for bridge preservation practitioners to exchange, promote and advance best practices, new technologies and innovation in the areas of highway bridge management, inspections, preservation and maintenance.

For information please contact Darlene Lane at 517-432-8220 and email hidden; JavaScript is required

LINKAGE

2017 MWBPP Annual Meeting

Posted in General, General News, News

A Conversation with David Miller, Chief Maintenance Engineer with Louisiana DOTD

David Miller with LaDOTD

Author: Lorella Angelini, Angelini Consulting Services, LLC

About one year ago, David Miller was promoted to the Chief Maintenance Engineer position at the Louisiana DOTD (LaDOTD). Before that he served for several years as the Bridge Maintenance Engineer for the State. David is happy his new position gives him the opportunity to remain involved with the bridge program and he can take preservation issues further. 

As Chief Maintenance Engineer David Millers’ responsibilities include managing the ferry systems, signs and signals, bridge inspection, loss prevention and truck permits.  He is also in charge of the statewide bridge crews that work on complex preservation projects and the statewide crews that specialize in putting up signals and sign trusses. On the other hand, the crews that carry out the day-to-day work for the maintenance of bridge and road assets are managed by the nine LaDOTD Districts

Some of the longest bridges in the United States are located in Louisiana. With 175,000,000 square foot of deck area (2016 FHWA data), Louisiana ranks as the fourth largest state for bridge deck area. It follows Texas, California and Florida, which all have a higher number of bridges than Louisiana. In addition to having long bridges that span over the Mississippi and across marshlands, Louisiana has also a large number of timber bridges (third most in the US), which were built years ago during the expansion of local timber industry.

What does bridge preservation entail at LaDOTD?

Bridge preservation can be divided in two parts in Louisiana. One part entails larger preservation projects that are managed through the bridge preservation program that has been in place for about 10 years. It is part of the overall bridge replacement, bridge rehabilitation capital program and allocates from $30 to $40 M per year specifically for bridge preservation projects. Projects are selected through a committee that takes input from the districts and are back checked with deterioration models from Pontis in the past, AASHTO BrIM currently.  This part is where the heavy lifting on the preservation side comes in.

The other part is funded through the operating side of the budget. This entails maintenance and preservation activities that are done by districts’ bridge crews and statewide crews. Unfortunately, our crews tend to do more emergency-related work than preventative maintenance because many bridges in Louisiana are in poor condition. (In 2016, LaDOTD reported 1,739 structural deficient bridges, corresponding to 13.5% of 12,915 total number bridges. Ed. Note). Our crews also focus on preserving our timber bridges to keep them open and safe.

What is your bridge preservation strategy?

Our strategy at LaDOTD is to improve the condition of bridges and their ratings every time it is possible. For example, if a paint project is scheduled for a particular bridge, we do not necessarily want to do the painting only. We evaluate whether there is a structural rehabilitation project that can be done in parallel to painting to improve the overall rating of the bridge. A pure painting project does not move the rating of a bridge from poor to good.

The majority of our preservation activities have been focused on bridges that are in poor conditions. Our goal is to bring these bridges from poor to fair or from poor to good. Mainly because of lack of funds, we are not at the point that we can do activities on bridges that are in good condition, which is the recommended preservation approach.

Our gas tax, 16 cents per gallon, was implemented in the 80s and has not changed, or been indexed, since then.  We recently went through an effort with our Legislators to try to increase the tax in order to have more funds to maintain bridge and road assets. Unfortunately, this effort failed to pass. This will make our responsibilities in maintenance difficult to carry out as we continue to deal with our relatively large number of posted and structurally deficient bridges. It will take additional funds to be able to get ahead of the curve and do more of strategic preservation activities on our bridges.

Four of the top five longest bridges in the United States are in Louisiana. Most of these bridges belong to the interstate system and are in good shape. However, having to deal with long bridges puts an additional strain on our resources.  Preserving a bridge that is 20-miles long and has a twin structure requires a lot of money. A tremendous amount of money is required just to tackle one element of the bridge, for instance the deck.

What is the LaDOTD strategy with structurally deficient bridges?

We have prioritized work on structurally deficient and posted bridges that are on the major truck routes.

We are also planning to replace all our timber bridges.  This poses a challenge as we have the third most timber bridges in the country.  Most of these bridges, which were built in the 50’s and 60’s, are deteriorated beyond their service life.

What are the challenges in the implementation of your preservation strategy?

As I said before, the biggest challenge for us is funding. Our administration understands the need for additional funding for highway infrastructure, so hopefully there will be additional funding in the future.

Do you have a success story you would like to share?

Probably the biggest success story is just the fact that LaDOTD has a bridge preservation program that has been in place for 10 years. There have been some major projects completed through this program. One of these was the rehabilitation of Huey P. Long – O.K. Allen Bridge crossing the Mississippi in Baton Rouge. This is a steel truss bridge over a mile long. It is a both a railroad and highway bridge, the only bridge of this kind owned by the state.  It was brought to fair condition through a rehab project that entailed structural repairs with member strengthening and painting. It was a typical preservation-style project even though it was necessary to use more than the normal preservation funds.

Is TSP2 helping LaDOTD reach your goals? And how?

TSP2 provides a very valuable forum for networking with peers from other states and federal agencies. During the annual South-East Bridge Preservation Partnership (SEBPP) meeting, we get the opportunity share knowledge, success stories and failures. We can learn from states that are ahead in certain areas of bridge preservation. We can also learn their preservation strategies and how they were successful in getting funding increases for their department. TSP2 is definitively a big plus for us.

I would suggest improving the liaison between TSP2 and the Sub-Committee on Maintenance (SCOM), specifically in relation to the flow of research projects. We streamlined this process at SCOM about two years ago (David is Vice Chair on the SCOM Bridge TWG for Asset Management, Performance Measures and Environment. Ed. Note) and now it is TSP2 that is addressing this process. There is the need for fine-tuning research needs between SCOM and TSP2.  There is definitively room for improvement in this aspect of the collaboration.

TSP2 is now sending representatives from its four regions to SCOM. This really helps with creating continuity between SCOM and TSP2.  For example, at SCOM we recently learned from the North-West TSP2 Region about the benefits of bridge washing and how to get through the process with environmental groups.  That would have never happened had the North-West Bridge Preservation Partnership (NWBPP) not sent representatives to SCOM.

In general, the more time SCOM and TSP2 people meet and have discussions the better they will be able to get on the same page.  Flow of information between SCOM and TSP2 is improving, but it could get better.

 

LINKAGE

Bridge Preventive Maintenance Program:

http://wwwsp.dotd.la.gov/Inside_LaDOTD/Divisions/Engineering/Bridge_Design/Pages/Preventive_Maintenance.aspx

Posted in Interview

Deck Preservation and Retaining Systems are Key Topics at the Upcoming NEBPP in NJ

Author: Lorella Angelini, Angelini Consulting Services, LLC

In less than two months, on September 11-13, the Northeast Bridge Preservation Partnership (NEBPP) meeting is scheduled to take place in New Brunswick, NJ. The meeting encompasses four sessions: deck preservation, research needs, case studies and retaining systems.

Over 150 bridge preservation practitioners specialized in maintenance and repair of concrete and bridge structures will be gathering in New Brunswick from the States that comprise the North-East region: Connecticut, District of Columbia, Delaware, Massachusetts, Maryland, Maine, New Hampshire, New Jersey, New York, Pennsylvania, Rhode Island, and Vermont. In addition to representatives from the owners, the meeting will also bring together contractors, consulting engineers, academia and manufacturers, who can showcase their innovation in products and services.

As with all TSP2 Bridge Preservation Partnership meetings, time will be dedicated to round tables where participants have the opportunity to exchange information and discuss practices that extends the service life of bridges.

Through the free and open exchange of ideas and information, the NEBPP’s mission is to better serve those who use the northeast transportation system. NEBPP strives to use innovation, new ideas, new products, and the combined experience of participant States to make bridge maintenance procedures and repairs the best that can be provided.

For more information please contact Darlene Lane at 517-432-8220 and email hidden; JavaScript is required

LINKAGE

https://tsp2bridge.pavementpreservation.org/northeast-nebpp/annual-meetings/2017-2/

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