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.
出处
《建筑材料学报》
EI
CAS
CSCD
北大核心
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)
关键词
蒸养混凝土
毛细吸水性
毛细吸附系数
吸水梯度
steam curing concrete
water sorptivity
capillary absorption coefficient
water-absorbing gra dient
