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43 posts categorized "Sustainability"

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? 

October 26, 2016

SCDOT & Sloan Rebuild I-85

Sloan I85 recapAdapted from "Fast Fix for Failing Freeway" by Tom Kuennen for Asphalt Contractor

A unique design for warm mix asphalt (WMA) enabled the South Carolina DOT (SCDOT) and its contractor, Sloan Construction, to get a mid-winter start early in 2016 on urgent reconstruction of failing I-85 in the northwestern corner of the Palmetto State. Because WMA can be compacted to required density at lower ambient temperatures, it can lengthen the paving season by enabling winter paving.

The warm mix additive also served as a compaction aid that permitted Sloan to quickly get specified density on twin lifts totaling nine inches, in time-limited night work, to avoid severe penalties for failure to reopen the highway in time for the morning rush in the busy Spartanburg—Greenville corridor.

On this project, in a single one-night shift, as much as nine inches of delaminated, failed pavement would be milled, and the warm mix additive Evotherm® allowed placement of two, four and one-half inch lifts in that single shift, rather than the three, three-inch lifts that would have been required under standard specs, making it impossible to open the pavement by morning rush hour.

The I-85 work was taking place between mile marker 56 to 68, milling out left and center lanes from five to nine inches, and for the right hand lane, milling out 10 inches and putting nine inches back. 

"The DOT realized that, in starting the project last year, the structure of the road didn't hold up the way they wanted it," said Dennis Ayers, senior project manager for Sloan North Region. "They re-let the contract to put in a new base course and reconstruct the road to handle the traffic."

"When we first started we were going to do a two or four inch mill-and-fill," said Chad W. Hawkins, P.E., C.P.M., state materials engineer, SCDOT, Columbia. "But some of the milling process got down into delaminated areas, and that's when the project was put on hold, and we thought 'What do we do now?'".

The pavements in this section were constructed in the 1950s and 60s, so finding out what went wrong is problematic. "Realistically, our two, three and four inch mill-and-fills over the last 50 years have caught up with us," Hawkins said. "It's time to do a major reconstruction, and that's what were finding on a lot of our interstates. We're having to do more than put a four inch 'band-aid'."

On a night in the northbound lanes in July 2016, crews were milling out 10 inches of failed pavement, and were replacing it with two, four and one-half inch lifts of leveling course pavement. They paved 1,000 feet in a single night shift, leaving room for the final driving course.

There, Ingevity's Evotherm enabled Sloan to get density on the first lift, and place the second four and one-half inch lift right on top of the first. Both lifts cooled rapidly to permit timely opening to traffic on the second lift.

Target densities were being met on site and in test strips. Also, Sloan was getting 93 percent density on the cold longitudinal joints, which go down nine inches. "The job is going well," said Todd K. Carroll, P.E., resident construction engineer, SCDOT, Spartanburg County. "They are able to produce a lot of mix every night, very efficiently. We've had a good project so far."

Read the full article in Asphalt Contractor Magazine here.

 

October 03, 2016

A Facelift For Florida

N Port What do three years, nine phases, $40 million, 266 centerline miles and "good for the environment" have in common? That would be the City of North Port’s massive pavement resurfacing program designed to address the needs of this growing area in Florida.

North Port is located one-half hour southeast of Sarasota, one hour south of Tampa and only 20 minutes from the scenic Gulf of Mexico. Despite its prime location and beautiful weather, the city’s roadway infrastructure was not so beautiful prior to 2014. In fact, its roadway system was failing. Matt LaChance, technical marketing at Ingevity, explains: “The city had ignored their infrastructure for many years before realizing that much of their 800 mile network was on the verge of failure. North Port leaders chose to bond $46 million to reconstruct or resurface 266 miles of selected roadways across the city so that the road network matched the beautiful scenery.”

Once the bond passed, the city had to ensure that the money was well spent. This is when engineering consulting firms HDR and VHB were brought on board to develop a specification and bid documents, as well as manage the projects and the public works staff. During the specification development phase, the consultants suggested that the city require the use of warm mix asphalt (WMA) to be both ecologically responsible and to gain greater road life by lowering temperatures. In order to ensure the lowest temperatures possible, the specification called for a chemical additive from the approved product list of the Florida Department of Transportation (FDOT). Matt explains: “Because the specification also called for the use of a liquid anti strip, Ingevity’s Evotherm® WMA technology was the natural choice for Ajax Paving, one of the asphalt producers that won bids.”

Ajax embarked upon what would become a much-needed facelift for the city’s roads: a 100,000 mix ton county—residential overhaul using Evotherm. Ajax produced a PG 58—28, 40% RAP, 9.5 mm surface mix terminally blended with Evotherm. The project began at 7:30 a.m. when the ambient temperature was in the mid 70s, quickly increasing to 93ºF. Mix was produced at 275ºF with minimal temperature loss over the 30-minute haul.

Rusty Reynolds of Ajax is emphatic that “the ability to produce this type of mix at 275ºF and achieve consistent density, texture and aesthetics during a 30-minute haul with minimal temperature loss is outstanding. This was a reality because we used Evotherm.”

The result of Team Ajax—North Port is an outstanding roadway that’s a testament to both partner’s openness to innovation and their tireless commitment to the environment.

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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