粗集料复掺对沥青稳定碎石性能影响研究

Effect of Compound Coarse Aggregate on the Performance of Asphalt Treated Base Mixtures

粗集料是沥青混凝土的主要组成材料,其对沥青混凝土性能起着重要的作用.在ATB-25沥青稳定碎石中研究了玄武岩、石灰岩、安山岩三种集料的粗集料复掺方法及其对沥青混凝土性能的影响.研究了粗集料整体置换复掺法和粗集料分档复掺法两种类型的复掺方法.引入有效密度概念保证研究的准确性.结果表明,粗集料复掺可以有效改变沥青稳定碎石的体积性能.使用石灰岩粗集料可以提高沥青稳定碎石的抗水损害性能.复掺入碱性粗集料或表面粗糙的粗集料可以改善沥青稳定碎石的力学性能,粒径越大的粗集料对沥青稳定碎石的抗疲劳性能影响越小.

Coarse aggregate is the main composition of asphalt concrete,which plays a vital role in the performance of asphalt concrete.The method of compound coarse aggregate of three kinds of aggregate of basalt,limestone and andesite was studied and its effect on the properties of asphalt concrete was analyzed in the process of ATB-25 asphalt treated base mixtures.The concept of effective density was used to ensure the accuracy of the study.The results show that the compound coarse aggregate can effectively change the volume performance of asphalt treated base mixtures.The water damage resistance of asphalt treated base mixtures is improved with limestone coarse aggregate.The coarse aggregates with alkaline or rough surface improve the mechanical properties of asphalt treated base mixtures.The greater the particle size of the coarse aggregate,the smaller impact on the fatigue properties of asphalt treated base mixtures.