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    Effect of Water-Film Thickness on Tire-Pavement Friction

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    The results of an extensive experimental investigation of the thin water films of thickness less than 0.38 mm (0.015 in.) on the tire-pavement friction are presented. Both laboratory and full-scale field tests involving new measuring equipment were conducted, and a new device was developed for laboratory measurement of rubber-surface friction. Also, a new apparatus was built to measure thickness of thin water films formed on pavement surfaces. The results from the laboratory and field tests indicate that the tire-pavement friction can decrease significantly at very thin water films from 0.025 to 0.230 mm (0.001 to 0.009 in.). A quantitative measure of the effect of water-film thickness on tire-pavement friction is proposed. The effects of tire, vehicle speed, and pavement texture on pavement wetness sensitivity are also investigated.


    tire-pavement friction, water-film thickness

    Author Information:

    Kulakowski, BT
    Associate professor, Pennsylvania Transportation Institute, Research Building B, The Pennsylvania State University, University Park, PA

    Harwood, DW
    Principal traffic engineer, Midwest Research Institute, Kansas City, MO

    Committee/Subcommittee: E17.21

    DOI: 10.1520/STP23352S