STP326: Friction Properties of Pavements at Different Speeds

    Schulze, K H
    Research engineer, Institute of Highway Engineering and Transportation, Technical University of Berlin, West Berlin,

    Beckmann, L
    Research engineer, Institute of Highway Engineering and Transportation, Technical University of Berlin, West Berlin,

    Pages: 8    Published: Jan 1962


    Abstract

    Based on measurements with a locked-wheel trailer on wet pavements, curves indicating friction coefficients versus speed can be plotted and classified by the degree of decrease of the coefficient with increasing speed. A correlation was found between the mean width of the voids in the pavement surface and the steepness of the friction-speed curve: the closer the surface, the steeper the curve.

    Friction coefficient and wear index differences between outside and inside lanes of four-lane highways provided a measure for the change of skid resistance caused by traffic. The mean decrease of the locked-wheel coefficients differed significantly at high speeds for mastic asphalt, fine asphalt concrete, and portland cement concrete pavements. Mastic asphalt pavements had the highest rates of decrease; cement concrete had the lowest. A significant relationship was found between the locked-wheel coefficients and the friction coefficients at 17 to 20 per cent slip (approximately the maximum coefficients) at single speeds up to 50 mph and for theoretical braking distances calculated by integration from the friction-speed curves.


    Paper ID: STP44405S

    Committee/Subcommittee: E17.23

    DOI: 10.1520/STP44405S


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