Variation of asphalt pavement friction coefficient with change of water film thickness

Abstract

Abstract:

The skid resistance of wet asphalt airport pavement is studied. The friction coefficients of three asphalt surfaces under the condition of different water film thicknesses are measured by remote sensor for pavement condition recognition and pendulum friction tester. By the test results,when water film thicknesses are in range of 0 ~ 1 mm,friction coefficients of the three surfaces show a downward trend and when the water film thicknesses are in range of 1 ~5 mm,friction coefficients remain unchanged. Based on the experimental data,the effecting mechanism of water film thickness on friction coefficient is analyzed and the variation model of friction coefficient with the change of water film thickness in range of 0~5 mm is established. The model indicates that as the water film thickness increases, the frictional interaction between the tire and the road surface gradually goes through three different stages of lubrication,and a logarithmic relationship between friction coefficient and water film thickness is found during the mixed lubrication stage. The influence of water film thickness on friction coefficient is mainly controlled by surface micro-texture,and the increase of water film thickness has less impact on friction coefficient in the case of low speed sliding.

Key words: asphalt airport pavement, friction coefficient, water film thickness, surface micro-texture, Stribeck effect

CLC Number:

ZHAO Hong-duo,WU Meng-zhu,WU Shi-tao. Variation of asphalt pavement friction coefficient with change of water film thickness[J]. .

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