Abstract
Because more recycled asphalt pavement (RAP) has become available to use in roadways, the Wyoming Technology Transfer–Local Technical Assistance Program Center and two Wyoming counties saw a need to investigate the use of RAP in gravel roads. The Wyoming Department of Transportation along with the Mountain Plains Consortium funded this study. The investigation explored the use of RAP as a means of dust suppression while considering road serviceability. Test sections were constructed in the two counties and were monitored for dust loss by means of the Colorado State University dustometer. Surface distress evaluations of the test sections were performed following a technique developed by the U.S. Army Corps of Engineers in Unsurfaced Road Maintenance Management (Special Report 92–26). The data collected were statistically summarized and then analyzed. The performance of RAP sections was compared with that of gravel control sections. This comparison allowed fundamental conclusions and recommendations to be made for RAP and its ability to abate dust. It was found that RAP-incorporated gravel roads can reduce dust loss without adversely affecting the road's serviceability. Other counties and agencies can expand on this research to add to the toolbox for dust control on gravel roads.