水泥稳定建筑固废再生集料抗冻性能研究
Anti-Freezing Performance of Cement-Stabilized Mixture for Recycled Aggregate from Solid Construction Waste
郑甲佳 1张来君 1王曦辉 1解建伟 2陈智勇3
作者信息
- 1. 中国路桥工程有限责任公司,北京市 100011;中交集团东非区域研发中心,肯尼亚 内罗毕 999070
- 2. 长沙理工大学交通运输工程学院,湖南 长沙 410114
- 3. 深圳市综合交通与市政工程设计研究总院有限公司,广东 深圳 518003
- 折叠
摘要
为给不同粒径再生集料的精细化利用提供参考,该文研究了再生集料粒径、掺量对水泥稳定再生集料混合料抗冻性能的影响.对不同粒径再生集料的基本性能指标进行测试,并通过击实试验确定最佳含水率和最大干密度,以4%的水泥掺量制备试件,通过测试混合料经冻融循环后的无侧限抗压强度损失来评价混合料的抗冻性能.试验结果表明:随着再生集料粒径和掺量增大,混合料的最佳含水率增大,最大干密度减小;掺加4.75～9.5 mm再生集料时,经过5次冻融循环,混合料冻融循环后强度随着掺量增加先升高后降低,经过10次冻融循环,混合料冻融循环后强度随着掺量增加逐渐降低;掺加9.5～19 mm与19～26.5 mm的再生集料时,随着再生集料掺量、粒径以及冻融循环次数的增加,混合料的冻融循环后强度逐渐降低.再生集料水泥稳定混合料抗冻性能变化规律随再生集料掺量、粒径的变化而各有不同,综合来看,随着再生集料掺量、粒径以及冻融循环次数的增加,其混合料抗冻性能变差.
Abstract
This paper investigated the effects of particle size and content of recycled aggregate on the anti-freezing performance of cement-stabilized recycled aggregate mixture,so as to provide a reference for the fine utilization of recycled aggregate with different particle sizes.The basic performance indexes of recycled aggregates with different particle sizes were tested,and the optimum moisture content and maximum dry density were determined by compaction test.The specimens were prepared with 4%cement content,and the anti-freezing performance of the mixture was evaluated by testing the unconfined compressive strength loss of the mixture after the freeze-thaw cycle.The results show that the optimum moisture content increases,and the maximum dry density of the mixture decreases with the increasing particle size and content of recycled aggregate.When recycled aggregate of 4.75-9.5 mm is added,after five freeze-thaw cycles,the strength of the mixture first increases and then decreases with the increasing content of recycled aggregate.After ten freeze-thaw cycles,the strength of the mixture decreases with the increase in the content of recycled aggregate.When the recycled aggregate of 9.5-19 mm and 19-26.5 mm is added,with the increasing content and particle size of recycled aggregate,as well as the number of freeze-thaw cycles,the strength of the mixture deteriorates.The variation law of the anti-freezing performance of cement-stabilized recycled aggregate mixture is different with the change in content and particle size of recycled aggregate.In general,with the increasing content and particle size of recycled aggregate,as well as the number of freeze-thaw cycles,the anti-freezing performance of the mixture is worse.
关键词
建筑固废/再生集料粒径/再生集料掺量/冻融循环次数/抗冻性能Key words
solid construction waste/particle size of recycled aggregate/content of recycled aggregate/number of freeze-thaw cycles/anti-freezing performance引用本文复制引用
基金项目
中国路桥工程有限责任公司科研项目(P2200001)
出版年
2024
国家科技期刊平台
NSTL
万方数据