摘要
运用电涡流方法测量混凝土早期收缩,研究了水胶比、引气剂和矿物掺合料等因素对混凝土早期收缩性能的影响.结果表明,水胶比为0.45的混凝土3d收缩率可达到78×10-6,复掺硅灰矿渣和引气剂时,混凝土3d收缩率达到113×10-6;随引气剂掺量增大,混凝土早期收缩增加,但在正常掺量范围内引气剂的影响较小;混凝土成型后400～1500min为水泥水化放热高峰,其早期收缩曲线出现膨胀或收缩减缓现象.
To understand early age shrinkage of concrete in order to get high performance concrete,an eddy current method was used to measure the early age shrinkage of concrete with different water-binder ratios and mineral admixtures such as fly ash,slag and silica fume and air-entraining admixture.The results show that the shrinkage of concrete with water-binder ratio of 0.45 reached 78×10-6 and that of concrete incorporating slag,silica fume and air-entraining admixture reached 113×10-6 in 3 days.Addition of air-e...
出处
《深圳大学学报（理工版）》
EI
CAS
北大核心
2009年第1期81-85,共5页
Journal of Shenzhen University(Science and Engineering)
基金
国家自然科学基金资助项目(50572127)
关键词
混凝土
收缩
电涡流
早期
引气剂
concrete
shrinkage
eddy current
early age
air-entraining admixture
