基于断裂能指数的乳化沥青冷再生混合料配制参数研究  

Research on Low Temperature Performance of Emulsified Asphalt Cold Recycled Mixture based on Fracture Energy Theory

作　　者：黄静宇 龙磊 廖丹 HUANG Jing-yu;LONG Lei;LIAO Dan(Hunan Road and Bridge Construction Group Co.Ltd.,Changsha 410219,China)

机构地区：[1]湖南路桥建设集团有限责任公司,长沙市410219

出　　处：《公路》2024年第8期144-151,共8页Highway

基　　金：湖南省自然科学基金项目,项目编号2020JJ5579;湖南省交通运输厅科技进步与创新计划项目,项目编号202107。

摘　　要：针对乳化沥青冷再生混合料(CRME),目前国内沥青路面再生技术规范中缺乏相应的低温抗裂性能指标要求。为进一步提升乳化沥青冷再生技术在寒冷地区沥青面层的应用范围,基于断裂能理论,通过半圆形弯曲试验(SCB)方法,研究并比较了再生剂、SBR胶乳、纤维、不同沥青等级、压实工艺、级配、乳化沥青含量、新集料、水泥和矿粉等10个因素对CRME低温抗裂性能的影响效果。试验结果表明:基于SCB试验方法定义的断裂能指数能很好地评价CRME低温抗裂性能;对比分析10种因素的影响效果,发现影响混合料低温抗裂性能的最显著因素是再生剂,其对断裂能指数的影响超过60%,其次是水泥、纤维和压实工艺,影响程度均超过30%;最后根据工程应用效果,总结出提升CRME低温抗裂性能的相关配制参数。该研究可为寒冷地区沥青路面养护维修提供一定的理论支撑。For emulsified asphalt cold recycled mixture(CRME),there is no corresponding low temperature crack resistance performance index requirement in the domestic asphalt pavement recycling technical specification at present.In order to further improve the application scope of emulsified asphalt cold recycling technology in asphalt pavement in cold regions,based on the fracture energy theory and through the semicircular bending test(SCB) method,the effect of 10 factors are studied and compared including recycling agent,SBR latex,fiber,different asphalt grades,compaction technology,grading,emulsified asphalt content,new aggregate,cement and mineral powder,on the low-temperature cracking resistance of CRME.The test results show that the fracture energy index defined by the SCB test method can well evaluate the low-temperature crack resistance of CRME.By comparing and analyzing the effects of 10 factors,it is found that the most significant factor affecting the low-temperature crack resistance of the mixture is the regenerant,which has an impact on the fracture energy index of more than 60%,followed by cement,fiber and compaction technology,with an impact degree of more than 30%.Finally,according to the engineering application effect,the relevant concrete measures to improve the low-temperature crack resistance performance of CRME are concluded.This study can provide certain theoretical support for the maintenance and repair of asphalt pavement in cold regions.

关 键 词：沥青路面 冷再生混合料 低温性能 断裂能理论 乳化沥青 

分 类 号：U416.217[交通运输工程—道路与铁道工程] TU528.42[建筑科学—建筑技术科学]