Mix Design

Rubber modified asphalts (RMA) have been around for decades to offer excellent performance with environmental and cost benefits. Despite real-world experience, RMA still constitutes less than 20 percent of modified asphalts. We see two primary drivers for this: limited application field and processability. Here, Tom Rosenmayer shares his vision of the future of rubber modified asphalts.

Precise specimen preparation is a key step in performing reliable performance testing, regardless of the material tested or the sophistication of your testing systems. Let’s explore some basic steps for achieving the appropriate range of specimen preparation.

An area that has seen benefits of the ALLU Transformer range is surface mining operations. The Transformer is designed to fit an excavator or loading shovel, which works for large scale surface mining operations where transportability is a requirement of material handling equipment. With many units now working throughout Brazil, one such application has seen […]

What was old has become new again as an N.B. West crew foam-recycled Missouri State Route AT in Franklin County—better known as Old U.S. Route 66—as part of a resurfacing project. U.S. 66 is the storied “Mother Road” from Chicago to Los Angeles and is often remembered as a dual-lane highway. Before that it was […]

Finding the right materials for statewide use is a monumental task when you have an area as big as Texas. State materials engineers for the Texas Department of Transportation (TxDOT) are charged with finding ways to increase the amount of reclaimed asphalt pavement (RAP) used in asphalt pavement mixes, and lengthen the life of pavements […]

We all know that in our industry, what works for one climate may not work for another, and low gyration mix designs are no exception. “We have a similar mix design at the National Center for Asphalt Technology (NCAT) test track in Alabama,” said Robert Semones, branch manager of the Kentucky Department of Transportation (KYTC) […]

Savvy asphalt producers and terminal owners keep an eye on the liquid market all around the globe. The ups and downs seen in South Africa and China in the past year(s) aren’t the only indicators of economic growth spurts overseas. To illustrate the marketplace in India specifically, the following excerpt is from the Bitumart Annual […]