For its FY 2015 paving program, the Town of Dedham, MA took a leading role and became one of the first municipalities in the Massachusetts Commonwealth to require the use of warm mix asphalt. With the intent of creating longer lasting pavements, Dedham’s Public Works Director, Joe Flanagan, added a WMA requirement to his specification that called for the use of an additive capable of a minimum temperature reduction of 50o F. With all of the paving being conducted in September and October, the extended workability of the mix was also appealing.
Contractor TL Edwards chose Evotherm for the project because of previous experience they had out of their plant in Plymouth, MA. This would be the first time they produced WMA at their Avon facility. After using Evoterm on several projects, Plymouth Operations Manager Steve Edwards, said “I have seen a lot of changes in the asphalt industry over the years, and I am excited about Evotherm. I can really see the benefits in using it”
About 5000 tons of WMA were placed in the first phase of the program in September. With the arrival of the cool New England weather, morning temperatures were dropping below 40 oF. Using Evotherm allowed the paving to begin at the scheduled time of 6:00 am on an unseasonably cold Saturday, keeping the project on schedule and minimizing user delay of a major arterial in town. Even with the low temperatures, compaction wasn’t an issue. The Town’s engineering consultant, Vanasse Hangen Brustlin (VHB) was tasked with quality assurance. VHB Pavement Engineering’s Jose Otero, commented, “We did see an increase in density, but what we really noticed was a big increase in uniformity of density”.
Dedham’s annual paving program is expected to be about 15,000 tons total this year, all of it being Evotherm WMA. Joe Flanagan summed it up by saying, “so far I’m impressed. I’m looking forward to continued success with the rest of the program and making it a permanent part of our specification”.
Author: Matt LaChance