摘要
收缩开裂是现代混凝土劣化的重要原因.采用改进的椭圆环收缩开裂试验、自由收缩和抗折强度试验,以及不同养护条件下混凝土抗压强度对比试验来综合评价矿渣微粉掺量对混凝土收缩开裂的影响.结果表明,矿渣微粉掺量为40%～50%时,胶砂初始开裂时间明显增长,混凝土自由收缩减小,混凝土早期收缩开裂性能显著改善,混凝土抗压强度达到最高;标准养护条件比干燥养护条件对矿渣微粉混凝土强度的发展更有利.
Shrinkage cracking is one of the most important factors of concrete deterioration. The effect of ground granulated blast-furnace slag (GGBFS) content on shrinkage cracking of concrete has been studied by means of modified ellipse ring shrinkage cracking test, non-restrained shrinkage, flexural strength and comparative compressive strength in different curing conditions. The results show that when dosage of GGBFS is 40%～50%, initial cracking time of mortar blending GGBFS increases and non-restrained shrinkage of concrete decreases apparently. Properties of initial cracking due to shrinkage are obviously improved. Compressive strength of concrete achieves the maximum. GGBFS is more beneficial to strength progress in the standard curing condition than in the dry curing condition.
出处
《武汉大学学报（工学版）》
CAS
CSCD
北大核心
2004年第1期77-81,共5页
Engineering Journal of Wuhan University
基金
国家重点基础研究发展规划"973计划"资助项目(编号:2001CB610704 3).
关键词
矿渣微粉
初始开裂时间
收缩开裂
自由收缩
养护条件
GGBFS
initial cracking time
shrinkage cracking
non-restrained shrinkage
curing condition
