摘要
针对我国现有规范关于乳化沥青冷再生混合料初期强度评价的空白,选取磨耗试验作为评价方法,用对比试验确定了试验的关键参数,包括成型方式、养生温度、养生相对湿度以及养生时间;分析了不同乳化剂种类、乳化剂剂量、乳化沥青用量、水泥剂量和矿料级配对乳化沥青冷再生混合料初期抗磨耗性能的影响,据此提出相应的技术要求;利用方差分析法,分析了不同影响因素的显著性。结果表明:提出的磨耗试验简单、可靠,可用于评价乳化沥青冷再生混合料的初期抗磨耗性能;马歇尔击实法或旋转压实法均可作为磨耗试验试件成型方式,推荐采用大型马歇尔击实法(双面各击实75次)作为标准成型方式;养生条件对乳化沥青冷再生混合料磨耗损失影响较大,随温度的升高或养生时间的延长,磨耗损失均逐渐减小,随相对湿度的增加,磨耗损失逐渐增大;结合我国国情,拟定磨耗试验试件标准养生温度为25℃,养生相对湿度为70%,养生时间为4 h。以磨耗损失不大于3.5%为控制指标,可作为优化乳化沥青冷再生混合料配合比设计的依据;影响乳化沥青冷再生混合料初期抗磨耗性能的各因素依次为水泥剂量>乳化剂种类>矿料级配>乳化沥青用量>乳化剂剂量,水泥剂量、乳化剂种类和矿料级配对冷再生混合料初期强度影响显著。
Aiming at the lack of evaluation of initial strength of emulsified asphalt cold recycling mixture in Chinese specification,by selecting abrasion test as the evaluation method,the key test parameters,including the compaction method,curing temperature,curing relative humidity and curing time,are determined by comparative test.The influences of different emulsifier types,emulsifier dosages,emulsified asphalt dosages,cement dosages and mineral gradations on the early anti-abrasion performance of emulsified asphalt cold recycled mixture are analyzed,and put forward the corresponding technical requirement.The variance analysis is used to analyze the significance of different influence factors.The result shows that(1)the proposed abrasion test is simple and reliable,and can be used to evaluate the early anti-abrasion performance of emulsified asphalt cold recycling mixture;(2)Marshall compaction method or rotary compaction method can be used as the compaction method of the abrasion test specimens,and the Marshall multi compaction method(75 times for both sides)is recommended to be the standard compaction method;(3)the curing condition has great influence on the abrasion loss of the cold recycled mixture,the abrasion loss decreases as the temperature or curing time increases,while the abrasion loss increases as the relative humidity increases;(4)combining with national condition,it is determined that the standard curing temperature of the abrasion test is 25℃,the curing relative humidity is 70%and the curing time is 4 h;(5)the abrasion loss of no more than 3.5%can be used as the control indicator and the basis for optimize the mix design;(6)the influencing factors of the early anti-abrasion performance of emulsified asphalt cold recycling mixture are as follows:cement dosage>emulsifier type>mineral gradation>emulsified asphalt dosage>emulsifier dosage,and the influences of cement dosage,emulsifier type and mineral gradation on the initial strength of the mixture are significant.
作者
王杰
秦永春
刘然
方文达
崔洪海
WANG Jie;QIN Yong-chun;LIU Ran;FANG Wen-da;CUI Hong-hai(Research Institute of Highway,of Ministry of Transport,Beijing 100088,China;Fangshan Highway Agency of Highway Administration of Beijing Municipal Commission of Transport,Beijing 102488,China;Jilin Traffic Planning and Design Institute,Changchun Jilin 130021,China)
出处
《公路交通科技》
CAS
CSCD
北大核心
2019年第4期8-14,共7页
Journal of Highway and Transportation Research and Development
基金
国家科技支撑计划项目(2014BAC07B01
2014BAC07B05)
交通运输部标准化项目(JT2016-126)
中央级公益性科研院所基本科研业务费专项资金项目(2018-9002)
吉林省交通运输科技项目(2016-1-10)
关键词
道路工程
技术要求
磨耗试验
乳化沥青冷再生混合料
初期强度
road engineering
technical requirement
abrasion test
emulsified asphalt cold recycling mixture
initial strength
