This report presents results obtained from testing at the G. A. Riedesel Pavement Testing Facility at Washington State University during the period of November 20, 1972 to May 1, 1973. The purpose of this project was three-fold: 1) to determine pavement wear caused by studded tires; 2) to evaluate the resistance of different pavement overlays used in the states of Washington and Idaho to wear caused by tire studs; and 3) to test pavement materials and overlays to reduce tire stud damage.
Ring #6 and Phase II of this project consisted of three concentric tracks on which 16 tires traveled in eight wheel paths. Four types of studs in passenger snow tires, two types of passenger tires, and unstudded truck tires, and 22 sections of various types of pavement overlays and surfacings were tested. Four different stripes were also tested. The results are based on wear in terms of rate of wear, area removed, maximum and average rut depths using the WSU profilometer and the camera wire shadow box apparatus. Skid resistance values were measured using the California Skid Tester and the English Portable Skid Tester. The results are valid only under WSU testing conditions.
The findings indicate that some pavement overlays are more resistant to the effect of studded tires than others. All types of studded tires tested caused some pavement wear and this affected skid resistance values. Some of the newer types of studs reduced wear of various pavement overlays. The pavements having the most wear resistance conversely had the lowest skid resistance retention characteristics. Additives to asphalt concrete helped wear resistance characteristics but lowered skid resistance retention characteristics.