蒸养混凝土的毛细吸水特性研究  

Water Sorptivity of Steam Curing Concrete

作　　者：贺智敏[1,2] 龙广成[1] 谢友均[1] 柳俊哲[2] 

机构地区：[1]中南大学土木建筑学院,湖南长沙410075 [2]宁波大学建筑工程与环境学院,浙江宁波315211

出　　处：《建筑材料学报》2012年第2期190-195,共6页Journal of Building Materials

基　　金：铁道部科技研究开发计划重大课题项目(2008G031-18);浙江省重大工程结构安全防护与健康服役科技创新团队项目(2010R50034);宁波市自然科学基金资助项目(2011A610078)

摘　　要：采用ISAT(initial surface absorption test)方法,试验研究了蒸养混凝土的毛细吸水特性,调查了胶凝材料组成、养护条件以及蒸养工艺对蒸养混凝土毛细吸附系数的影响,并探索了相应影响机制及降低蒸养混凝土毛细吸水性的技术途径.结果表明:相对于标养条件,蒸养混凝土由表及里不同位置呈现更大的毛细吸水梯度;混凝土暴露表层的蒸养效应是导致其毛细吸水梯度增大的主要原因;采用粉煤灰、矿渣及硅灰复掺技术、对蒸养后的混凝土进行后续水养以及在蒸养过程中对暴露表层进行保湿覆盖处理均能减少蒸养混凝土的毛细吸附系数,降低蒸养混凝土由表及里的毛细吸水梯度.Initial surface absorption test（ISAT） method was employed to investigate the water sorptivity of steam curing concrete as well as the effects of binder types, curing condition and steam-curing technology on capillary absorption coefficient of concretes. The corresponding mechanisms and technical measure- ments reducing capillary absorption role of steam curing concrete were studied. Results indicate that, compared with standard curing concretes, a much higher water absorption gradient from exposure surface to interior of steam curing concretes is observed, which results from the bad effects of elevated temperature on the top surface directly exposed to steam during steam curing period. The capillary absorption coeffi cient of steam curing concrete and the corresponding gradient of capillary absorption from exposure surface to interior both can be decreased by incorporating a compound of fly ash and slag or silica fume, using such technical measurements as subsequent water curing and/or water-retaining coverage.

关 键 词：蒸养混凝土 毛细吸水性 毛细吸附系数 吸水梯度 

分 类 号：TU528.01[建筑科学—建筑技术科学]