摘要
以不同水灰比、不同含气量、不同掺合料及不同掺合比例、不同养护方式下的混凝土为研究对象,研究了各配比混凝土的基本性能;并采用电通量法及氯离子渗透深度研究了混凝土的抗氯离子渗透性能。研究结果表明,减小水灰比、适当引气、加掺合料及良好的养护方式可有效改善混凝土的抗氯离子渗透性能,在一定掺量范围内,混凝土中掺硅粉比掺矿渣粉或粉煤灰的抗氯离子渗透性能好。在此基础上,提出了高寒地区有抗氯离子渗透性能要求的混凝土配制方案：含气量宜3%~5%;掺20%~30%粉煤灰或矿渣,或掺5%~8%的硅粉,硅粉和矿渣粉或粉煤灰双掺效果更好。
In this paper,the performance of concrete is studied through different water-cement ratio,different air-content,different admixtures,different admixture contents and different curing methods,and Electric Flux Method and Penetration Depth of Chloride are both adopted to study the chloride-permeation resistance of concrete in high-cold area.The results show that,decreasing w/c ratio,proper air content,adding admixtures or curing well can improve the resistance of chloride-permeation;within some contents,the chloride-permeation resistance using silicides is better than using fly-ash or slag.On this basis,the proper scheme of mix ratio used in high-cold area is recommended： the air-content is 3%～5%,the content of fly-ash or slag is 20%～30%,the content of silicides is 5%～8%,and double mixed with silicides and fly-ash or slag,the chloride-permeation resistance of concrete in high-cold area is better.
出处
《公路》
北大核心
2011年第2期137-143,共7页
Highway
基金
西藏交通厅科技攻关项目"西藏高寒地区提高桥梁结构混凝土耐久性关键技术研究"
项目编号2008005
关键词
混凝土
掺合料
含气量
抗氯离子渗透性能
concrete
admixture
air content
chloride-permeation resistance
