沥青路面表面水膜厚度试验

汽车在有水膜覆盖的路面上行驶时,轮胎与路面之间的附着力降低程度与道路表面水膜厚度有关,道路表面的水膜厚度越厚,附着力降低越多。道路表面的水膜厚度和下面几个因素有关:降雨强度,坡面的构造深度、长度以及坡度。本项目修建9个试验段,包括3种不同的沥青混合料级配和3种不同的坡度,并且进行了人工降雨试验,实测了表面的水膜厚度。根据测得的试验数据,回归了水膜厚度的计算公式,该式和英国的经验公式相比,能够反映出坡面粗糙程度对水膜厚度的影响,可以用于工程实践,预估道路表面的水膜厚度。

Test Depth of Water Film on Asphalt Pavement Surface

While automobiles traveling on roads covered with water film,the adhesion between tire and road surface will decrease.This decrease is related to the depth of water film:the thicker the water film is,the more reduction of adhesion will be.The thickness of the water film is related to the following factors:rainfall density,texture depth,length,and gradient of the slope.Considering these factors,we constructed nine test segments,which include three gradation types of asphalt mixture and three different gradients.Then we tested the thickness of the water film by sprinkler.According to the tested data,we have a calculating formula for the thickness of water film by regression.Compared with the empirical formula introduced from England,the regressed formula reflects the influence caused by coarseness of sloping and can be applied to practice to forecast the water film thickness on the road surface.