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Asphalt Article March 02, 2015

I-376 Section L04 is a major north/south artery in the greater Pittsburgh metropolitan area.

Twelve million: According to the U.S. Environmental Protection Agency, that’s how many tires are ground up and recycled into crumb rubber for use in asphalt pavements each year.   Yet, despite this impressive figure, the practicality of paving with crumb rubber remains an untried novelty in many...
Asphalt Article March 02, 2015

Total lift thickness for the roundabout was 6.5 in. The 19-mm mix was used for the first lift (2.5 in. thick) and second (2.25 in. thick), but Northeast Asphalt had to use a Wisconsin DOT higher ESAL mix for the 1.75-in. surface course.

Last year’s modern day Ice Age buried routes across the U.S. with its frozen malice.   Many public works officials had to pick through the remains of pavement during the spring and summer months of 2014.    Up in Wisconsin, the glacier-like effect left an 8.1-mile portion of State Trunk Highway (...
Asphalt Products February 23, 2015
Crack sealant is not all created equal. Meeting specifications is one metric, but studies have shown that meeting a particular specification does not equal long-term performance on the road. In many field performance studies conducted by federal and state agencies over the last 30 years, Crafco...
Asphalt Products February 17, 2015
StrataBase is a rigid biaxial geogrid that provides structural reinforcement for paved and unpaved roads through superior stiffness, aperture stability and interlock capabilities. StrataBase is used for base reinforcement for flexible pavements; subgrade and foundation improvement; parking areas...
Asphalt Products February 17, 2015
StrataWeb provides three-dimensional soil reinforcement and solves problems associated with load support over soft soils, erosion on steep slopes and the linings of lagoons, drainage channels and landfills. Applications involving slopes as steep as 60 degrees from horizontal can be achieved with...
Asphalt Products February 17, 2015
The patented Sleeve-It System (rail integration device) is a code-compliant fencepost anchoring system that integrates stable fence footings into the support structures of retaining walls while the retaining walls are being constructed. Sleeve-It maximizes useable real estate at the top of a...
Asphalt Products February 17, 2015
StrataTex (STSeries) is a needle-punched nonwoven geotextile made of 100% polypropylene staple fibers, which are formed into a random network for dimensional stability, and StrataTex (SWSeries) geotextile fabrics are woven polypropylene materials offering optimum performance when used in...
Asphalt Products February 17, 2015
StrataDrain is a high-flow, fusion-bonded, geonet-geotextile drainage composite. It is used primarily as a sheet interceptor drain behind retaining walls and as an internal interceptor drain for reinforced steep slopes. The strength and uniformity of the fusion bond between StrataDrain's layers...
Asphalt Products February 17, 2015
Stratagrid geogrids reinforce soil with their high molecular weight and high tenacity polyester yarn. They are mechanically and chemically durable—in the installation phase, in aggressive soil or in aqueous environments. Stratagrid was designed to be a reinforcement material that is easy to install...
Asphalt Article February 06, 2015

Two case study OGFCs were constructed as part of the 2012 NCAT Pavement Test Track, which used GTR-modified binders and no fibers. No cracking or raveling are evident in either test section to date.

Asphalt mixtures are commonly comprised of various ratios of aggregate, asphalt binder and air. While this is usually the case for standard dense-graded Superpave mix designs, specialty mixtures such as open-graded friction courses (OGFCs) and stone-matrix asphalt (SMA) mixes typically contain some...
Asphalt Article February 06, 2015
A full-depth reclamation (FDR) project involving the removal of a failed portland cement concrete pavement and the construction of an 8-in. stabilized reclaimed asphalt pavement (RAP) and aggregate base with an engineered asphalt emulsion, is hardly an event of Biblical proportions. But the long-...
Asphalt Article February 06, 2015
Pavements continue to be among the most recycled materials on the planet. Over the past several decades, the asphalt industry has successfully innovated the use of reclaimed asphalt pavement, or RAP. This has inarguably led to significant environmental and economic benefits. To move the needle...
Asphalt Article February 06, 2015
By the beginning of 2014, Mooney Road through California’s Sierra Nevada Mountains bore a strong resemblance to its lunar namesake.  “The road gets lots of heavy truck traffic for logging, plus lots of snow and ice build-up in the winter, so the whole thing was wheel-rutted out,” Weston Hutchings,...
Asphalt Article February 06, 2015
Reclaimed asphalt pavement (RAP) has rapidly become a dependable means of resurrecting roadways in the state of California. As Greg Kelley, assistant deputy director for the Geotechnical and Materials Engineering Division of Los Angeles County, told Roads & Bridges, “Every agency should...
Asphalt Article February 06, 2015
Several of the trees entrenched in the landscape covered by District 2 of the Pennsylvania Department of Transportation (PennDOT) are marked to become a piece of expensive furniture.You can’t find better cherry, maple or oak wood anywhere else in the U.S. Unfortunately the roads which service the...
Asphalt Article February 05, 2015
The winter of 2013–14 was a brutal one for residents of Merrillville, Ind., and nearby Crown Point. Roads in these Chicagoland communities south of Lake Michigan took a pounding from extended cold, snow and ice. “The roads were in real rough shape after that long, hard winter,” said Scott Rediger...
Asphalt Article February 05, 2015
Binders, quality aggregate and performance-related mix design procedures are all important factors in dictating how long a new road surface will last. For many years, researchers have traditionally focused on these rather than identifying the root cause of early surface failures, which is often...
Asphalt Article February 05, 2015

Photo courtesy of the NY DOT.

In 2011, almost 71% of the petroleum used in the U.S. was used in the transportation sector, accounting for 27% of U.S. energy demand. Despite a 50% increase in the overall fuel economy of passenger vehicles between the years 1973 and 2000, the average fuel economy of heavy vehicles increased less...
Asphalt Article February 05, 2015
When the National Center for Asphalt Technology (NCAT) started its 2012 research cycle, the famed Pavement Test Track was not the only home for the center’s cutting-edge asphalt-pavement research. As part of NCAT’s Preservation Group (PG) experiment, researchers tracked the effects of traffic and...
Asphalt Article February 05, 2015
The harsh winters and colder temperatures experienced in northern Wisconsin can have a significant negative impact on long-term performance of asphalt pavements. Cold weather contraction and brittleness of asphalt driving surfaces can result in cracking and other defects. As a result, cities and...

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