自密实混凝土自由收缩试验

Experiment on Free Shrinkage of Self-compacting Concrete

进行了自密实混凝土的自由收缩试验,以粉煤灰掺量和混凝土龄期作为影响因素,研究其收缩的发展规律;基于试验数据,通过双曲线方程拟合了自密实混凝土自由收缩的计算式。研究结果表明:自密实混凝土自由收缩随混凝土龄期的增加而增大,后期自由收缩应变增长较缓慢;当粉煤灰质量掺量在40%时,各阶段的自由收缩应变都最小;拟合的自密实混凝土自由收缩计算式可以为自密实混凝土结构相关设计提供参考。

Taking incorporation rate of fly-ash and age of concrete as influence factors,the experiment on free shrinkage was conducted in order to study the law of free shrinkage of self-compacting concrete.Based on the test data,the calculating formulae of free shrinkage of self-compacting concrete were put forward by hyperbolic equations.The research results show that free shrinkage of self-compacting concrete grows with age of concrete,and the growth gets slowly in the later.The free shrinkage strain in different stages is the smallest while the incorporation rate of fly ash is 40%.The calculating formulae of free shrinkage of self-compacting concrete can be taken as reference to design of self-compacting concrete structure.