Mix Design

In the past, technology hadn’t paved the way for the successful use of ground tire rubber (GTR) in asphalt mix designs the way it has today. Now we have the means to grind tires “finer.” We can use advanced mixing chemicals that facilitate the use of wet process and dry crumb rubber modified asphalt cements […]

Every racing fan knows that to win, a driver needs a good pit crew. For a racetrack to succeed, it needs a good paving crew. That’s exactly what the owners of Spring Mountain Motor Resort and Country Club in Pahrump, Nevada, found in Wulfenstein Construction Company. Spring Mountain is a motorsports country club that also […]

“This is an exciting time to be in asphalt recycling research,” Dr. Amy Epps Martin said. She is a professor and the A.P. & Florence Wiley Faculty Fellow in Texas A&M’s Zachry Department of Civil Engineering. “My dad began his research career in the field of asphalt recycling in the 1970s and 80s when oil […]

Researchers at the National Center for Asphalt Technology (NCAT) at Auburn University in Alabama study failed as well as successful experimental sections on their pavement test track. The latest three-year research cycle at the track includes a special focus group of pavement sections they hope will fail. The reason: they learn as much from evaluating […]

IMP Technologies (IMPTEC) of Adelaide, Australia, has developed a super fine crusher that is designed to reduce comminution costs and the energy associated with producing material for ordinary Portland cement (OPC). Spokesperson Chris Kelsey explained the piece of equipment will not be displayed outside of Australia until license agreements have been finalized, but the company […]

Ask anyone in the asphalt industry what the drawback of using crumb rubber additive for a recycling project is and they’ll tell you the temperature creates a “scent” issue. While the aroma of highly heated crumb rubber may smell like saved money and environmental sustainability to those of us in-the-know, it smells stinky to the […]

The standards division of the city of Los Angeles developed a fast, simple, repeatable test with the Rutwheeler from Pine Instruments, Grove City, Pennsylvania, to predict permanent deformation and moisture susceptibility in hot-mix asphalt Superpave designs. The sprawling city of Los Angeles has approximately 6,500 centerline miles of roads and 800 centerline miles of alleys […]