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The Florida State Road Department, in cooperation with the Bureau of Public Roads, conducted a skid resistance correlation study at Dunnellon Airport in Marion County, Florida, during October and November, 1967 — Twenty different organizations participated in the testing.
The principal objective of this study was to evaluate the degree of standardization achieved by several skid test trailers constructed in accordance with the newly developed ASTM Test for Skid Resistance of Pavements Using a Two-Wheel Trai1er.
The experimental design for the trailer tests included zoning of the test pavements and randomized testing sequence to equalize the differences within a given surface and to reduce the effect of extraneous variables. The trailers were tested at 20, 40 and 60 MPH.
Results of the trailer tests indicate good reproducibiIity within the individual trailers and fair correlation between some of the trailers. However, a considerable interaction was evident between the trailers and the sites tested. Good reproducibility was obtained with trailers utilizing their self-watering systems even though large differences resulted between the trailers.
Texture measurements were also made on all surfaces using the Texas Text-Ur-Meter, the NASA Grease Test and the Bureau of Public Roads Outflow Meter. Satisfactory correlation between the coefficient of friction, speed gradients and texture measurements on the different surfaces was not achieved.
testing, skid resistance, friction, skid number, skid trailers, correlation, pavements, surfaces, texture, self-watering
Smith, L. L.
Deputy Engineer of Materials, Florida State Road Department, Gainesville, Florida
Fuller, S. L.
Research Engineer, Florida State Road Department, Gainesville, Florida