破碎型页岩陶粒沥青混合料最佳掺量及路用性能研究

Study on the Optimum Content and Road Performance of Crushed Shale Ceramsite Asphalt Mixture

为确定破碎型页岩陶粒在沥青混合料中的最佳掺量,采用破碎型页岩陶粒等体积替代传统粗集料制备不同陶粒掺量的沥青混合料,并进行高温性能、水稳定性能、低温性能和抗滑性能试验.结果表明:随着陶粒掺量的增加,沥青混合料高温性能、摆式摩擦系数逐渐提高,但构造深度逐渐降低;陶粒的少量掺加可以改善沥青混合料的水稳定性、低温性能,但陶粒的大量掺加会导致水稳定性和低温性能降低.综合各项指标,推荐的最佳陶粒掺量为20%.相比传统沥青混合料,陶粒掺量为20%的沥青混合料的劈裂抗拉强度比提高了7.8%、摆式摩擦系数提高了5.6%,高温动稳定度、低温弯拉应变、构造深度指标变化幅度较小,均在5%以内.

In order to determine the optimum content of broken shale ceramsite in asphalt mixture,the asphalt mixture with different content of ceramsite was prepared by using the same volume of broken shale ceramsite instead of traditional coarse aggregate,and the tests of high temperature performance,water stability performance,low temperature performance and skid resistance were carried out.The test results show that with the increase of ceramsite content,the high temperature performance and pendulum friction coefficient of asphalt mixture gradually increase,but the structural depth gradually decreases.The water stability and low temperature performance of asphalt mixture can be improved by adding a small amount of ceramsite,but the water stability and low temperature performance will be reduced by adding a large amount of ceramsite.According to all the indexes,the recommended optimum content of ceramsite is 20%.Compared with the traditional asphalt mixture,the splitting tensile strength ratio and pendulum friction coefficient of the asphalt mixture with 20%ceramsite increase by 7.8%and 5.6%,while the dynamic stability at high temperature,flexural-tensile strain at low temperature,and structural depth index change within 5%.