粗集料形态对沥青混合料性能的影响研究现状

摘要

沥青混合料是高等级路面常用的铺面材料,粗集料占沥青混合料总质量的50%以上,粗集料形态(形状、棱角和纹理)对沥青混合料性能具有重要影响.本文系统总结了国内外学者在这方面的研究成果,并得出:针片状粗集料含量增加会降低沥青混合料的高温稳定性、水稳定性和抗疲劳性能,提高粗集料的棱角性可以增强沥青混合料的抗车辙性能,增强粗集料的纹理性可以改善沥青混合料的高温稳定性、水稳定性和低温抗裂性.基于对现有研究的分析,建议今后进一步研究不同长短比区段的粗集料对沥青混合料性能的影响,以及全面研究粗集料棱角和沥青混合料的高温性能、低温性能、水稳定性和疲劳性能之间的关系.%Asphalt mixture is the common material used in road pavements.Coarse aggregates are the main components of asphalt mixture whose percentage is greater than 50% by weight. The effects of coarse aggregate morphology ( shape, angularity and surface texture ) on asphalt mixture performances are significant.This paper summarizes the main findings of the existing studies. The main conclusions of the existing studies are as follows:increasing the content of the flat and elongated aggregates can decrease the high temperature stability,water stability and fatigue resistance performance of asphalt mixture,increasing the angularity of coarse aggregates can increase the anti-rutting performance of asphalt mixture, and increasing the surface texture of coarse aggregates can improve the high temperature stability, water stability and low temperature anti-cracking performance of asphalt mixture. Based on the analysis of existing studies, the following two problems are suggested to be further studied:the effect of coarse aggregates of different flat and elongated ratios on asphalt mixture performances;and the relationship between the coarse aggregate angularity and the asphalt mixture performances including the high temperature stability,low temperature anti-cracking resistance,water stability and fatigue resistance.