Effect of gypsum on free and restrained shrinkage behaviour of slag-concretes subjected to various curing conditions

被引：8

作者：

Aly, Tarek K. ^{[1
]}

Sanjayan, Jay G. ^{[1
]}

机构：

[1] Monash Univ, Dept Civil Engn, Clayton, Vic 3800, Australia

来源：

MATERIALS AND STRUCTURES | 2008年 / 41卷 / 08期

基金：

澳大利亚研究理事会;

关键词：

slag; gypsum; concrete; shrinkage; cracking;

D O I：

10.1617/s11527-007-9337-7

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

The effect of gypsum in slag-blended cement on free and restrained shrinkage of concrete subjected to various curing conditions is presented in this paper. Added gypsum in slag-blended cements was found to increase the autogenous shrinkage of concrete up to 56 days. However, added gypsum caused small reduction in the long-term shrinkage when the concrete was exposed to drying. Slag concretes with 3% added gypsum content, when exposed to drying at the age of 24 h, exhibited more cracking tendency than comparable concrete with 0% added gypsum. This is attributed to the increased shrinkage evolution of slag concrete with 3% gypsum content at early ages. However, if moist cured for 7 days, increasing the amount of gypsum from 3 to 5% in slag-blended cement reduced the cracking tendency. It is concluded that the beneficial effect of increasing gypsum in reducing cracking tendency in slag concrete is only favourable if moist cured for 7 days.

引用

页码：1393 / 1403

页数：11