Author(s):
B.M. Gallaway, J. Epps, H. Tomita
Publication Date
March 1971
Abstract
Data are presented relating the various pavement surface characteristics, operating modes of tires, and field methods of measuring skid numbers for different pavement surfaces. Void areas were determined for 41 pavement surfaces and correlated with the reduction in skid numbers caused by an increase in speed from 20 to 60 mph. The correlation coefficients were statistically significant. Void areas of highway surfaces can be increased by increasing the macro-textures of the surface to obtain small decreases in skid number with increased speed. Microscopic textures and small-scale macroscopic textures (in terms of centerline average heights) are also significantly correlated with the skid number measured by a skid trailer equipped with a standard E-17 test tire.|Equations are provided to permit predictions of the skid numbers at 20 mph from the texture parameters of pavement surfaces. Reduction in the skid number due to increasing speed may also be predicted by equations involving the void areas at the tire-pavement interface. Thus, the data presented offer a means of pre-evaluation of the expected skid characteristics of pavements.
Report Number:
138-4
Link(s):
Document/Product
http://tti.tamu.edu/documents/138-4.pdf
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