摘要
混凝土内养护可以明显改善高性能混凝土自收缩,阐述了饱水轻集料内养护的作用机理,研究了饱水轻集料取代粗骨料对混凝土收缩的影响,试验结果表明:10%、30%、50%等体积取代粗骨料,有效降低混凝土自收缩和干缩,1d自收缩分别降低了12.5%、35%和65%,28 d自收缩分别降低了9%、29%和49%;混凝土干缩降低幅度随轻集料取代率的增加而增加,50%等体积取代时,1 d、3 d7、d1、4 d和28 d干缩分别降低了21%、26%、25%、26%和24%。
Internal curing is especially beneficial to reduce autogenous shrinkage of high performance concrete. In this paper, the mechanisms of internal curing using saturated lightweight aggregate （SLWA） was described first. Then the effect of internal curing through partial replacement of coarse aggregates by SLWA on the development of shrinkage was investigated. Experimental results clearly demonstrated the efficiency of the substitution of coarse aggregate by SLWA in reducing autogenous shrinkage and drying shrinkage. When the coarse aggregate was replaced by SLWA at the percentage of 10%, 30% and 50% by volume, the autogenous shrinkage was decreased by 12.5%, 35% and 50% at age of 1 d, 9%, 29% and 49% at age of 28 d. The drying shrinkage drop increased with the increasing lightweight aggregate replacement. When the coarse aggregate was replaced by SLWA at the percentage of 50% by volume, the drying shrinkage was reduced by 21%, 26%, 25%, 26% and 24% at 1 d, 3 d, 7 d, 14 d and 28 d age respectively.
出处
《武汉理工大学学报》
EI
CAS
CSCD
北大核心
2008年第5期24-27,共4页
Journal of Wuhan University of Technology
关键词
内养护
轻集料
高性能混凝土
自收缩
干缩
Internal curing
lightweight aggregate
high performance concrete
autogeneous shrinkage
drying shrinkage
