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44 posts categorized "Regional and State Issues/Policy"

July 18, 2016

Oklahoma Is Where It's At

OKDOT LTPPHow does warm mix asphalt (WMA) perform compared to hot mix asphalt (HMA) in the long term? How is foam different than chemical additives? What happens to an asphalt mix when WMA is used in conjunction with RAP? These and many other questions are on the minds of USDOT, FHWA and State Highway Agency leadership. In order to find answers, the FHWA’s LTPP launched a new Specific Pavement Study (SPS) that will monitor the long-term performance of WMA. The purpose of the SPS-10 experiment, as explained on LTPP’s website, is to “narrow the knowledge gap that currently exists between the performance of WMA and HMA pavements...SPS-10...is designed to explore how a set of primary factors influence pavement performance. These factors include the WMA technology used, environmental elements (temperature and moisture), and traffic loadings.”

Projects are planned across the U.S. The first projects were constructed in 2015, with plans to construct more in 2016. Currently, the SHA tracks the project’s performance for five to six years post construction, with performance data being posted to the FHWA’s LTPP Database.

Each project has three core test sections: a HMA control, WMA with foam, and WMA with a chemical additive. Highway agencies have the opportunity to include supplemental test sections in order to perform additional research that meets their specific needs. The Oklahoma Department of Transportation (ODOT) is a great example of an Agency that is strategically partnering with the FHWA, LTPP and other key players in order to monitor road performance. As part of ODOT’s trial, contractor TJ Campbell chose to use Evotherm® and Evoflex® CA. Ingevity, under the leadership of Richard Steger, P.E., is also assisting ODOT with asphalt binder and mix testing. These results are expected in approximately two months, while LTPP is expected to publish their data by 2017.

We applaud ODOT on their SPS-10 efforts and look forward to the results. Keep up the great work while we wait.


June 29, 2016

Trailblazing Clean Air in Casselberry

If the word “trailblazer” is defined as “pioneer or innovator,” then the City of Casselberry, Florida, certainly fits the bill. For several years, Casselberry has had a goal of being a truly “green” city. In this vein, the city developed a city-wide road improvement program that would allow roads to be paved at the lowest possible temperatures in order to minimize their carbon footprint.


Casselberry_LaChanceIn early 2013, the City of Casselberry developed its own Specification for Warm Mix Asphalt Pavement (CASB 334), based on the Florida Department of Transportation’s (FDOT) specification, but tailored to better suit projects of the size and nature of the local government. This made the city the first in the state to require the use of WMA instead of HMA for its large public road rehabilitation projects. Kelly Brock, Assistant Public Works Director and City Engineer for the City of Casselberry, explains: “We now have the benefit of saving energy, reducing emissions and improving working conditions, compaction and pavement longevity.”

The city’s first project using this WMA specification in 2013 was Road Rehabilitation Area 1-3,a milling and resurfacing of approximately eight miles. Kelly Brock continues: “Since then, another seven miles of road rehabilitation and reconstruction have been completed with WMA, for a total of 15 miles through April of 2016. It’s a total of more than 20,000 tons of WMA.”

Today, the city has been awarded Honorable Mention for the 2016 Clean Air Award from the Central Florida Clean Air Team. City of Casselberry, blaze on!

November 30, 2015

Mac n Cheese

Mac cheese

Macaroni and cheese appears at every Thanksgiving dinner at my house. NCAT Director Randy West must have had the holidays on his mind when talking about RAP and WMA with Equipment World magazine. "They go together, like peanut butter and jelly or macaroni and cheese," he said referring to the "excellent" rut and crack resistance in high RAP, WMA pavements. Other highlights from the article include:

  • RAP & WMA projects winning NAPA Quality in Construction Awards
  • 40% RAP and WMA for thinlay, residential work in Texas

Evotherm improves compaction and workability for warm mix asphalt mix designs with RAP contents up to 35%. The introduction of Evoflex, alone or in combination with Evotherm, can make even higher binder replacement percentages possible. These new mix designs venture into the 50% territory, achieving high performance at an exceptional value. As good as mac 'n cheese, but I will stick to my mom's recipe this week.

Author: Heather Dolan

May 04, 2015

Ontario's Paver of the Year

Cruickshank Paver of the Year

The Ontario Ministry of Transportation named Cruickshank Construction Paver of the Year for their work on the Napanee stretch of Highway 401. The project was completed in the fall of 2014. Cruickshank earned the majority of the bonuses achievable on the project for mix properties and compaction, and full bonus for smoothness and segregation," said CEO Steve Cruickshank. This became a classic example of how Evotherm warm mix asphalt technology combines with excellent paving practices to yield bonuses for ride and compaction that lead to top road performance.

Crews had to complete 9,929 meters (6 miles) of crack repair to the HMA layers overlying the concrete base. After full depth repairs were made, the top 50 mm was milled and then repaved with a 50-mm lift of SP 19mm followed by a 40 mm lift of SP 12.5mm GC2 for a total thickness of about 240 mm. 

Author: Bryan Pecht


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  • Jason Bausano Ryan Bragg Lance Brooks Will Cabell Everett Crews Heather Dolan Dean Frailey Tejash Gandhi Jason Mapes, Quality Jonathan Maclver Jenna Michael Mike O'Leary Bryan Pecht