环氧再生沥青混合料低温抗裂性能研究
Low-temperature crack resistance of epoxy reclaimed asphalt mixture
刘峰 1李善强 2俞昊 3陈炳燊 3张启然 2陈楚鹏2
作者信息
- 1. 广东交通实业投资有限公司,广东 广州 510000
- 2. 广东华路交通科技有限公司,广东 广州 510000
- 3. 东南大学交通学院,江苏 南京 211189
- 折叠
摘要
通过设计四组不同的材料组合,制备了环氧再生沥青混合料试件进行半圆弯拉试验评估其抗裂性能,并通过声发射技术表征其开裂过程.结果表明,路面回收旧料(RAP)掺加质量分数为30％时核壳橡胶(CSR)改性环氧再生沥青混合料相比未经改性混合料-10℃下峰后断裂能提升54.4％,达到了 976.29 J/m2,总断裂能达到了 2 000.49 J/m2,CSR大幅提升了环氧再生沥青的低温抗裂性能,其性能指标达到优于全新环氧沥青混合料的水平.RAP含量较低时,混合料抗裂性能所受影响较小.此外,添加再生剂时,环氧再生混合料的断裂能小幅度提高但其脆性变大.
Abstract
By designing four groups of different material combinations,the epoxy recycled asphalt mixture specimens were prepared for a semi-circular bending test to evaluate the crack resistance,and the cracking process was characterized by a-coustic emission technology.The results showed that compared with the unmodified mixture,the post-peak fracture energy at-10 ℃ of the core-shell rubber(CSR)modified epoxy recycled asphalt mixture with 30wt％recycled asphalt mixture(RAP)increased by 54.4％,reaching 976.29 J/m2,and the total fracture energy reached 2 000.49 J/m2.The low-temper-ature crack resistance of epoxy recycled asphalt was greatly improved by the CSR,and its performance index reached the level of better than the new epoxy asphalt mixture.When the RAP content was low,the crack resistance of the mixture was less affected.In addition,when the regenerant was added,the fracture energy of the epoxy recycled mixture increased slightly but its brittleness became larger.
关键词
环氧再生沥青混合料/核壳橡胶/改性/低温抗裂性/半圆弯拉试验/声发射试验Key words
epoxy recycled asphalt mixture/core-shell rubber/modification/low temperature crack resistance/semi-circular bending test/acoustic emission test引用本文复制引用
出版年
2024
NETL
NSTL
万方数据