沥青混合料抗剪强度影响因素评价指标研究

Index of Factors Influencing the Shear Strength of Asphalt Mixtures

较高的抗剪强度可以保证沥青混合料在高温下具有良好的抵抗永久变形的能力。主要采用单轴贯入试验,就如何选择高性能沥青混合料的材料设计参数指标进行了研究。研究结果表明,除了沥青的性能外,粗集料、特别是细集料的性能对沥青混合料抗剪性能也有极大的影响。在进行沥青混合料设计时,采用高棱角性指标的粗、细集料以及高粘度的沥青来提高沥青混合料的整体抗剪强度。并且在施工时控制混合料的压实度以确保沥青路面的长期性能。

Asphalt mixtures with high shear strength have great capability to resist perpetual deformation under high temperatures. We used a single penetration test to analyze the material design indexes for high performance asphalt mixtures. The test results show that the performance of the asphalt binder and the performance of the coarse aggregate, especially the fine aggregate, greatly affect the shear strength of asphalt mixtures. We also suggest that the coarse aggregate with a high aggregate particle index, fine aggregate with high angularity, and asphalt with high viscosity can increase sharply the shear strength of an asphalt mixture. Furthermore, the degree of compaction of an asphalt mixture should be controlled to guarantee excellent longterm performance of asphalt pavement.