乳化沥青冷再生混合料疲劳性能研究

发布时间：2017-12-27 19:18

本文关键词：乳化沥青冷再生混合料疲劳性能研究　出处：《公路交通科技》2015年02期 　论文类型：期刊论文

【摘要】：采用目前工程上常用的两档沥青路面铣刨旧料对RAP掺量为80%和100%的乳化沥青冷再生混合料进行材料组成设计。通过击实试验和劈裂试验分别确定其最佳流体含量和最佳乳化量用量。在配合比设计基础上采用控制应变加载模式对乳化沥青冷再生混合料疲劳性能进行试验研究,确定了加载较为合理的应变水平,即300,250,200με和150με。试验结果表明,在应变水平较高时,两种RAP掺量下乳化沥青冷再生混合料能承受有限的荷载作用次数,当应变水平降低到150με时,两种RAP掺量混合料在150万次荷载作用下仍未破坏,采用劲度模量与荷载作用次数预估的方法确定了疲劳寿命。通过对4种应变水平-荷载作用次数进行疲劳曲线拟合,提出两种RAP掺量下乳化沥青冷再生混合料的应变控制指标。
[Abstract]:The material composition of the cold recycled mixture of emulsified asphalt with RAP content of 80% and 100% is used in the current two grade asphalt pavement milling materials used in the project. The optimum fluid content and the optimum emulsification amount were determined by the compaction test and the splitting test. Based on the mix proportion design, the fatigue performance of the emulsified asphalt cold recycled mixture was tested by using the control strain loading mode, and a reasonable strain level of loading was determined, namely 300250200? E and 150? The test results show that at high strain levels, two kinds of RAP dosage cold recycling emulsified asphalt mixture can withstand the load times limited, when the strain level is reduced to 150 mu epsilon, two RAP dosage of asphalt mixture in the 1 million 500 thousand loads is not destroyed, the number of methods to predict the stiffness modulus with the load to determine the fatigue life. According to the fatigue curve fitting of 4 kinds of strain level - loading times, the strain control indexes of two kinds of cold recycled mixture of emulsified asphalt under the RAP content are put forward.
【作者单位】：北京市市政专业设计院股份公司;长安大学道路结构与材料交通行业重点实验室;北京市政路桥建材集团;
【分类号】：U414
【正文快照】： 0引言近年来随着人们环保意识的增强,冷再生材料越来越多地应用于我国路面结构层中,同时,我国原有的设计体系和设计指标逐渐体现出各种弊端,国外长寿命路面的设计理念日益被国内道路研究者所重视,如经典的shell设计法、AI设计法等,这些方法都是以控制沥青层底拉应变和土基顶面

【相似文献】