The objectives of the study were 1) to identify sources of native aggregates with varying histories of skid resistance performance; 2) to evaluate and correlate native aggregate characteristics, processing techniques, and other factors with skid resistance and surface mixture performance; and 3) to provide guidelines for implementation of research findings. Limestone, sandstone, river gravel, and control aggregates (granite, traprock, and slags) were subjected to a battery of tests to determine physical relationships between aggregate type and skid resistance.

Laboratory results were analyzed for correlations among themselves and for correlations with skid number data obtained from pavements containing aggregates involved in the study. No significant correlation could be found between any of the laboratory results and field skid numbers. This was particularly disturbing with reference to the KTRP test. It was thought that it could be used to adequately predict field skid performance. However, preliminary findings have shown no such relationship. It is recommended that the KTRP test be amended to provide a more defined weight loss over time to attempt to explain the behavior of an aggregate's skid resistance over time.

Report Date


Report Number


Digital Object Identifier



The contents of this report reflect the views of the authors who are responsible for the facts and accuracy of the data presented herein. The contents do not necessarily reflect the official views of policies of the University of Kentucky, the Kentucky Transportation Cabinet nor the Federal Highway Administration. This report does not constitute a standard, specification, or regulation.