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For this project, in-depth reviews were conducted to identify the property aspects of aggregates used for high friction surface treatment (HFST), including aggregate abrasion value (AAV), Los Angeles abrasion (LAA), Micro-Deval abrasion, and polished stone value (PSV). Extensive laboratory testing was conducted to examine the selected property aspects for the calcined bauxite and steel slag that may be used in Indiana. Both laboratory accelerated polishing and true traffic polishing were carried out to evaluate the effects of aggregate properties and the long-term friction performance of the HFST candidates. Field friction test data was utilized to evaluate the longterm friction performances of chip seal, microsurfacing, ultrathin bonded wearing course (UBWC), and diamond grinding. Statewide vehicle crash data over a 5-year period was examined to determine the crash statistics associated with pavement friction. Statistic models were developed to predict the crash rate in terms of pavement friction for interstate, US, and state highways, respectively.

Friction Surface Treatment Selection: Aggregate Properties, Surface Characteristics, Alternative Treatments, and Safety Effects