粗集料轮廓形状参数及其对沥青混合料路用性能影响研究

Experimental Study on the Influence of the Contour Shape of Coarse Aggregate on Pavement Performance of Asphalt Mixture

为明确粗集料轮廓形状对沥青混合料路用性能的影响,选取SUP-20级配,对比分析人工配置不同近立方体含量粗集料与五种不同产地来源粗集料的轮廓形状。研究针度、片度、扁平系数、球度对沥青混合料路用性能的影响。通过高温车辙试验、冻融劈裂试验、单轴贯入抗剪切试验等试验结果与轮廓形状指标的相关性验证。发现当近立方体粗集料含量为50%时,沥青混合料高温稳定性和水稳定性最佳。扁平系数与沥青混合料路用性能相关性最好,推荐扁平系数作为粗集料轮廓形状控制指标。

In order to investigate the shape of coarse aggregate of asphalt mixture pavement performance,select the SUP-20 gradation,analyze the contour shape of coarse aggregate of the cube content of different coarse aggregate configurated artificially and coarse aggregate from five kinds of different sources.Investigate the influence of the needle index,slice degree,flat coefficient and sphericity on the pavement performance of the asphalt mixture.The correlation between the results of high temperature rutting test,freeze thaw split test,uniaxial penetration shear test and contour shape of coarse aggregate was verified.It is found that when the content of the cube coarse aggregate is 50%,the high-temperature stability and water stability of the asphalt mixture are best.The flat coefficient has the best correlation with the pavement performance of asphalt mixture,and the flat coefficient is recommended as the control index of the contour shape of coarse aggregate.