Synthesis Study on Variable Asphalt Shot Rates for Seal Coats (0-5833-S)

This project summary report summarizes the research performed in Texas Department of Transportation (TxDOT) Project 0-5833. The project involved a cooperative effort to collect, process, and make available information about successful methods of varying seal coat asphalt application rates across treated roadways to optimize aggregate retention and avoid wheel path flushing. This topic is of critical importance to maximizing value obtained from the Texas Department of Transportation's (TxDOT's) multi-million-dollar preventive maintenance program. Researchers conducted a literature survey and interviewed TxDOT's highly experienced personnel to capture knowledge that had been gained through years of roadway practice. All districts currently using transverse variable asphalt rates (TVAR) reported success with its application. Using the information gathered, researchers developed construction specifications and a field guidebook for use in five regional workshops.