硅酸盐通报2017，Vol.36Issue(6)：1841-1846,6.
不同养护温度下引气剂对混凝土性能的影响研究
Influence of Curing Temperature and Air Entrained Agent on the Performance of Concrete
摘要
Abstract
By experiment, the gradual-loss law and influencing factors of the air content of concrete and the effects of curing temperature and air entraining agent on concrete compressive strength, chloride ion permeability and micro pore structure were studied.Results show:The air content of fresh concrete is related to the initial gas content of concrete, the greater initial gas content, the greater loss.In the dynamic process, the fresh concrete containing gas loss is greater than the static process.Compared with standard curing condition, the negative temperature curing on the one hand makes hydration reaction of concrete more slowly and hydration degree lower, on the other hand, water turns into ice can also cause the expansion of the volume, destroy the inside crystal structure of concrete and damage the internal pore structure of concrete (the damage is not recoverable to a certain extent), this is why the compressive strength of concrete decreases, the chloride ion permeability and the bubble spacing factor increase.Air entraining agent can introduce a large amount of tiny bubbles, as a result, the pore content of small aperture in concrete will increase.To a certain extent, air entraining agent improves the connectivity of pores, reduces the relative stress area of concrete, thereby, the compressive strength of concrete decreases, the electric flux increases and the pore size distribution will shift towards the direction of small aperture.关键词
混凝土/含气量/抗压强度/抗氯离子渗透性/微观结构Key words
concrete/air content/compressive strength/chloride ion penetration/microscopic structure分类
建筑与水利引用本文复制引用
李强,王起才,代金鹏,余小龙,薄士威..不同养护温度下引气剂对混凝土性能的影响研究[J].硅酸盐通报,2017,36(6):1841-1846,6.基金项目
长江学者和创新团队发展计划滚动资助(IRT_15R29) （IRT_15R29）
国家自然科学基金(51268032) （51268032）
