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2 posts from January 2017

January 30, 2017

Reviving Rubber in Florida

P&S USE

“We had been hit with almost $51,000 in penalties on a job mandated to use rubber because the bottom kept dropping out of the mix,” says Tim Carter, quality control at P&S Paving based in Daytona Beach, Fla. “These AC content anomalies were just killing us. Until Evoflex® RMA turned things around.”

Such was the predicament of Carter’s team at P&S Paving in November of 2016. They found themselves paving an 11-mile stretch of State Road 19 in Putnam County near the Ocala National Forest. Almost an hour and a half from the mix plant, Carter’s team began the 16,000-ton job using an alternative PG 76-22 asphalt rubber binder (ARB) for the 12.5 mm friction course mix. But after multiple attempts to meet density requirements, Carter’s team needed an alternative solution.

Enter Ingevity’s Evoflex RMA, a hybrid pelletized additive for mixes that mandate the use of rubber. RMA is unique because it combines ground tire rubber (GTR), SBS polymer and Ingevity additives into an easy-to-use-pellet. Evoflex RMA allows the use of existing plant blending equipment; consistently produces on-spec binders; and comes with the world-class technical support that customers expect from Ingevity.

“Many contractors think it’s extremely difficult to achieve density with a stiff binder containing rubber,” says Lance Brooks, technical marketing manager at Ingevity. “That’s just not true. This project was an hour and a half haul; was paved in cool November and December ambient temperatures; and had a PG 76-22 hybrid ARB binder. The binder even sat in the tank for almost two months after being blended at the liquid supplier’s asphalt terminal.”

“The specification required 93% density,” reports Carter. “We achieved 93 to 94 percent throughout the mat. We have worked with Ingevity and know the great technical service we get from the team, so this made our choice to use RMA much easier. But even for contractors or asphalt suppliers unfamiliar with Ingevity’s products, these results speak for themselves.”

Crew members on the job remarked about how easily the mix went down using the standard rolling pattern and were surprised to have such workable material with the stiff PG grade and rubber added.

“The Evoflex was a game changer,” shares Carter. “We went from scratching our heads and getting hit with penalties pre-Evoflex RMA, to celebrating and winning a bonus after we began using it. We made back almost all of our losses with RMA.”

Click here to learn more about Evoflex RMA or contact evoflex@ingevity.com.

January 25, 2017

Warming Up The Inauguration

Penn Ave

For over 200 years, the presidential procession and inaugural parade have marked the beginning of the new U.S. Commander in Chief’s term in office. Although the majesty of the procession and swearing-in ceremony garner most of the attention, the behind-the-scenes preparations for an event of such grandeur cannot be overlooked. Beginning months prior to the January 20th celebration, the parade route must undergo significant construction and beautification projects. It is here that Ingevity’s Evotherm® is making some history of its own.

As part of the infrastructure improvements leading up to the event, the blacktop along the parade route gets a facelift. The already-plunging temperatures in Washington, D.C. in late October are a large consideration when paving. For the second inauguration in a row, Evotherm warm mix asphalt technology was selected as the preferred technology.

Ryan Bragg, field and applications engineer, explains: “Usually the Washington D.C. Department of Transportation releases the bid for this project last minute and it typically becomes a rush to finish before the cold weather sets in. The contractor in charge was looking for a product that would help with compaction and workability in the cold weather because they would be paving a very thin lift (only 1-¼ inches) in 40 degree temperatures at night.” Traditionally, a lift this thin will experience rapid heat loss from both the surface it is being placed on, as well as the colder outside air. By using Evotherm, the contractor ensured a longer window for the crews to achieve required compaction numbers on this job during the last week in October.

“It is both humbling and flattering that Ingevity’s technologies continue to be the go-to choice for high profile projects. It’s a great testament to what our team has accomplished with Evotherm,” says Jonathan MacIver, business director. “Contractors in the D.C. area look to our warm mix technology when they must be able to meet compaction and workability requirements despite the cold weather.”

How can Evotherm bring some warmth to your next project? 

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Contributors

  • 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