- 目录
- 混凝土与制品
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矿物掺合料和引气剂对混凝土抗盐冻性能影响的
作者：张立群，贾辰辰，张晓冉，张静轩，胡靖宇
（河北建筑工程学院 土木工程学院，河北 张家口 075000）
摘要：我国北方地区钢筋混凝土桥梁结构存在明显的盐冻病害现象，采用在混凝土中单掺引气剂、单掺硅灰、单掺粉煤灰、双掺硅灰和粉煤灰及双掺并掺引气剂的方法，提出了引气剂及矿物掺合料的最优掺量。结果表明，对C30、C40强度等级混凝土而言，掺加引气剂对混凝土抗盐冻性能的影响较水灰比更为显著， 0.02%和0.03%掺量的引气剂能有效提高混凝土的抗盐冻性能；混凝土
抗盐冻性能随硅灰掺量的增加呈先增强后减弱的趋势，硅灰的较优掺量为5%~10%。
关键词：混凝土引气剂；硅灰；粉煤灰；抗盐冻性能
中图分类号：TU528.04 文献标识码：A 文章编号：1001-702X（2018）12-0005-05
Study on the influence of mineral admixtures and air-entraining agents on the salt-freezing resistance performance of concrete
ZHANG Liqun，JIA Chenchen，ZHANG Xiaoran，ZHANG Jingxuan，HU Jingyu
（College of Civil Engineering，Hebei University of Architecture，Zhangjiakou 075000，China）
Abstract：There is obvious salt-frozen disease phenomenon in reinforced concrete bridge structure in northern China. This paper proposes the optimal amount of air-entraining agent and mineral admixture by taking the method for single-blown air-entraining agent，single-doped silica fume，single-doped fly ash and double-doped silica fume，fly ash and double-doped with air-entraining agent in concrete. The results show that，for C30 and C40 strength grades of concrete，the addition of air-entraining agents has a more significant effect on the salt-freeze resistance performance of concrete than water-cement ratio. 0.02% and 0.03% of air-entraining agents can effectively improve the salt-freezing performance of concrete. The salt-freeze resistance performance of concrete shows a tendency of increasing first and then weakening with the increase of silica fume content. The optimum content of silica fume is between 5% and 10%.
Key words：air-entraining agent of concrete，silica fume，fly ash，salt-freeze resistance performance