使用三维扫描仪获取3种级配OGFC沥青混合料试件表面三维数据,计算了试件表面的平均轮廓深度(MPD)、峰顶数目和算术平均峰顶曲率,用摆式仪对不同降雨量条件下OGFC试件的抗滑性能进行了测试,并分析了表面特征与抗滑性能的关系.结果表明,OGFC的MPD随着级配变粗呈增大趋势;OGFC试件表面的总峰顶数目随级配变细而增多,且峰顶数目在深度方向呈偏态分布,而算术平均峰顶曲率与级配无明显关系;随着降雨量增加,OGFC的摩擦系数先迅速减小,略有增大后,趋于稳定;降雨条件下,OGFC摩擦系数与MPD有一定关系,但受浅层表面峰顶数量的影响更大.
A 3D scanner was utilized to obtain the surface information of 3 kinds of open-graded asphalt friction course (OGFC) with different aggregate gradations in this study.The mean profile depth (MPD), peak number and arithmetic mean of peak curvature (Spc) were calculated.In addition, skid resistance performance of specimens was measured by the portable pendulum tes-ter to study the relationship between surface characteristic parameters and skid resistance.Results indicated that MPD increased with the coarseness increasing of the aggregate gradation.The total peak number of the OGFC surface increased by refining aggregate gradation.Meanwhile the distribution of peaks showed skewness in depth.However, the Spc was almost irrelevant with grading.With the increase of rainfall, the friction coefficient of OGFC might be reduced rapidly initially, and then slightly increased, and kept stable finally.In the rainfall conditions, the friction coefficient of specimens had a little correlation with MPD, while the number of peaks in shallow surface was believed to affect the friction coefficient more significantly.
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