动水作用对沥青混合料低温抗裂性的影响

摘 要: 为了研究动水作用对沥青混合料低温抗裂性能的影响，本文将动水作用引入试验，利用自行开发的模拟实际沥青路面受动水作用的室内实验装置，提出了荷载、水、温度三者共同参与的动水作用试验方法。基于此方法，从沥青标号、级配类型、空隙率三种因素出发，对7种沥青混合料动水作用前后的低温抗裂性能进行研究。研究表明动水作用对沥青混合料的低温抗裂性存在不利影响。不同因素下，其影响的程度是有差异的。对于空隙率为10%的混合料，其低温抗裂性能受动水作用的影响程度最高；在最不利的空隙率10%下，骨架结构的沥青混合料低温性能受动水影响比悬浮结构的要小；粘度大的沥青制成的混合料其低温抗裂性能受动水作用的影响较大。

Influence of dynamic water on the anti-cracking performance of asphalt mixture at low temperature

Abstract: In order to research on the influence of dynamic water on the low temperature anti-cracking performance of asphalt mixture, this paper introduces the dynamic water effect into the test, develops a laboratory test device for simulating asphalt pavement affected by dynamic water, and puts forward a test method of dynamic water effect working together with load, water and temperature. Based on this method, the low temperature anti-cracking stability of seven kinds of asphalt mixture is studied with the factors of asphalt grade, gradation type and air voids. The results show that the dynamic water can take adverse effect for the low temperature stability of asphalt mixture. The effect extent is different under different factors. For the mixture with 10% air voids, the influence by the dynamic water effect is the most, for the mixture with the skeleton structure gradation is better than the suspended structure at the most disadvantage air voids, and the mixture made of high viscosity asphalt is more affected.