Dr. Kevin Hall, associate professor of civil engineering, and graduate student Stacy Williams, a two-time recipient of the U.S. Department of Transportation's Dwight D. Eisenhower Transportation Fellowship, are trying to reduce the cost of highway degradation by developing a way to make roads that do not rut. This would substantially improve driver safety and decrease car repair expenses while producing roads that last longer. Currently there is not a good correlation between laboratory and field data. Their findings indicate a need to develop a readily-available, simple test that can be used to screen flexible pavements before they are constructed to ensure they will perform as expected. Americans travel an average of 17,000 miles per year in their cars.
Most states experience premature flexible pavement failures due to both rutting and stripping.
It is the physical separation of the asphalt binder from the aggregate in a mix. However, many different polymers and asphalt cements can be used. In addition, rock and sand differ widely in shape composition. So you have to use manufactured sand. The correct formula for an asphalt mixture depends on the environment and traffic levels where it will be used.