基于矿料级配的沥青路面低温抗裂性优化

Optimization of low-temperature cracking resistance of asphalt pavement based on mineral grading

低温抗裂性是沥青路面的重要性质之一,良好的低温抗裂性可以保证路面的使用寿命以及路基的稳定性。文章采用目前国内常用的沥青混合料级配设计方法,以低温线收缩性为衡量标准,通过对比相同沥青用量下,AC-5、AC-10、AC-13 3种类型的沥青混合料低温抗裂性能的差异,确定具有最佳低温抗裂性的矿料级配类型以及最大公称粒径。

Low temperature cracking resistance is one of important properties of asphalt pavement.Good low temperature cracking resistance can improve the service life of the pavement and the stability of subgrade.Based on the method of asphalt mixture grading which is generally used in China,and taking linear contraction as the criterion,this paper compares the differences of low temperature cracking resistance between three types of asphalt mixture AC-5,AC-10 and AC-13 with the same bitumen content.Then the type of mineral grading and nominal maximum aggregate size can be determined so as to achieve optimal low temperature cracking resistance.