Continuing Investigation of Polishing and Friction Characteristics of Limestone Aggregate in Ohio

摘要

Due to increased focus on maintaining highway operating safety and reducing wet weather accidents, the Ohio Department of Transportation has initiated a research to develop a laboratory scale accelerated polishing device that can mimic the actual abrasion and polishing actions between the vehicle rubber tires and the HMA (Hot Mix Asphalt) surface. The intent was to use the developed accelerated polishing device to screen the hot mix design and the aggregates sources to ensure satisfactory field performance in terms of providing adequate friction (skid resistance) during the expected life span of the pavement. Toward this goal, a new laboratory scale accelerated polishing device has been designed, fabricated, and test-validated. The device uses the rubber pads as the means to achieve the accelerated polishing action, while offering the desired features such as the use of the Gyratory compacted specimens for testing, short test duration (6 to 8 hours), and minimum labor efforts. The validity of the test device and the accompanied test procedures were ascertained by comparing with the polishing and friction test results of the constituent aggregates using the ASTM standard British Polishing Wheel Test.