摘要
通过基本力学性能试验,对比研究了三灰碎石等半刚性基层材料的强度特性。基于失水率、干缩应变、干缩系数等指标,研究分析了三灰碎石和其他半刚性基层材料的干缩性能。回归分析了累计干缩量与时间和累计失水率的关系。并通过温缩试验分别研究了温度收缩系数与温度区间的关系、平均温缩系数与最大温缩系数的关系。研究表明:在三灰碎石外掺水泥小于2%的情况下,三灰碎石的干缩性能、温缩性能均优于水泥粉煤灰稳定碎石和水泥稳定碎石,但是均比二灰碎石稍差。建议三灰碎石外掺水泥的含量不超过2%,通过早期养护提高三灰碎石的干温缩性能;推荐以0^-10℃之间的温缩系数评价三灰碎石的温缩性能。
Through experimental research of basic mechanical properties,comparative study of the strength properties of semi-rigid base materials including lime-flyash-cement stabilized macadam was carried out.Through study of the indices of water loss rate,dry shrinkage strain and shrinkage coefficient,dry shrinkage performance of lime-flyash-cement stabilized macadam and other semi-rigid base materials was analyzed.By regression analysis,the relation of accumulative dry shrinkage amount with time and accumulative water loss rate was got.Through temperature shrinkage test,the relation between temperature shrinkage coefficient and temperature range was studied,and the relation between average temperature shrinkage coefficient and maximum temperature shrinkage coefficient was researched.The results show that（1）when cement admixture dosage of lime-flyash-cement stabilized macadam is less than 2%,dry shrinkage performance and temperature shrinkage performance of lime-flyash-cement stabilized macadam are superior to those of cement-flyash stabilized macadam and cement stabilized macadam,but a little worse than those of lime-flyash stabilized macadam.It is suggested that the cement admixture dosage of lime-flyash-cement stabilized macadam is less than 2%,to improve the shrinkage performance of lime-flyash-cement stabilized macadam through early curing,and to evaluate the temperature shrinkage performance of lime-flyash-cement stabilized macadam using temperature shrinkage coefficient of 0～-10 ℃.
出处
《公路交通科技》
CAS
CSCD
北大核心
2011年第1期31-36,55,共7页
Journal of Highway and Transportation Research and Development
基金
交通部西部交通建设科技资助项目(200531881213)
关键词
道路工程
三灰碎石
试验研究
抗裂性能
干缩性能
温缩性能
road engineering
lime-flyash-cement stabilized macadam
experimental study
crack resistance
dry shrinkage performance
temperature shrinkage performance
