摘要
为评价中面层沥青混合料的低温性能,对7种AC-20沥青混合料进行M2F梯形梁动态模量试验、小梁低温弯曲试验和中梁线收缩系数试验,分析复模量、相位角、最大弯拉应变、应变能密度和线收缩系数5个试验指标的评价结果及相关性,选出最优的低温性能评价指标。研究结果表明:采用不同的试验方法及评价指标分析各沥青混合料低温性能,结果存在明显差异。在评价指标方面:在-10℃下的相位角是M2F梯形梁动态模量试验的最佳评价指标,最大弯拉应变是小梁低温弯曲试验的最适宜指标,线收缩系数是评价沥青混合料低温性能较为合适的指标。在各沥青混合料低温性能优劣方面:SBS改性沥青混合料的低温性能最优,橡胶沥青和抗车辙剂改性沥青混合料的较为接近,高标号沥青混合料的低温性能比低标号沥青混合料的更好。适当提高粗集料含量可提升沥青混合料的低温性能,热再生沥青混合料的低温性能相对较差。
To evaluate the low-temperature performance of middle layer asphalt mixtures,dynamic modulus tests of M2F trapezoidal beams,low-temperature bending tests of small beams,and line shrinkage coefficient tests of middle beams were conducted on seven AC-20 asphalt mixtures.The evaluation results and correlations of five test indexes,including complex modulus,phase angle,maximum bending strain,strain energy density,and line shrinkage coefficient,were analyzed to select the optimal evaluation indexes for low-temperature performance.The results show that there are significant differences in the evaluation results of low-temperature performance of each asphalt mixture using different test methods and evaluation indicators.Among them,the phase angle at-10℃is the optimal evaluation index for the M2F trapezoidal beam dynamic modulus test,the maximum bending strain is the most suitable index for the low-temperature bending test of small beams,and the line shrinkage coefficient is a suitable index for evaluating the low-temperature performance of asphalt mixtures.SBS modified asphalt mixtures have the best low-temperature performance,followed by rubber asphalt and anti-rutting agent modified mixtures,and high-grade asphalt mixtures have better performance than low-grade ones.Increasing the coarse aggregate content appropriately can improve the low-temperature performance of asphalt mixtures,but the low-temperature performance of recycled asphalt mixtures is relatively poor.
作者
张思琴
查旭东
邹博
王旭东
ZHANG Siqin;ZHA Xudong;ZOU Bo;WANG Xudong(School of Traffic and Transportation Engineering,Changsha University of Science&Technology,Changsha 410114,China;Research Institute of Highway Ministry of Transport,Beijing 100088,China)
出处
《交通科学与工程》
2023年第2期23-30,共8页
Journal of Transport Science and Engineering
基金
国家自然科学基金资助项目(51878077)
中铁五局集团有限公司科技项目(2020[12])
安徽省交通运输科技进步计划项目(201720)。
关键词
沥青混合料
低温性能
评价指标
相关性分析
相位角
线收缩系数
asphalt mixture
low-temperature performance
evaluation index
correlation analysis
phase angle
linear shrinkage coefficient
