Shrinkage-reducing measurement of high strength self-compacting concrete

被引：0
|
作者：
Yan, Peiyu [1 ]
Yu, Chenghang [2 ]
Wang, Qiang [1 ]
Zhang, Bo [1 ]
机构：
[1] Department of Civil Engineering, Tsinghua University, Beijing,100084, China
[2] Beijing Zhongchao Concrete Co. Ltd., Beijing,100024, China
来源：
Kuei Suan Jen Hsueh Pao/Journal of the Chinese Ceramic Society | 2015年 / 43卷 / 04期
关键词：
High performance concrete - Hardening - Self compacting concrete - Shrinkage;
D O I：
10.14062/j.issn.0454-5648.2015.04.01
中图分类号：
学科分类号：
摘要：
The effect of dosage of shrinkage-reducing admixture (SRA) and super adsorbent polymer (SAP) on the workability, compressive strength and volume stability of C70 self-compacting concrete was investigated. The microstructure of hardened concrete containing SAP was analyzed to explain the shrinkage-reducing mechanism of SAP. The results show that SRA and SAP both can decrease the autogenous shrinkage of self-compacting concrete. SAP has higher shrinkage-reducing efficiency and less negative influence on the workability of concrete rather than SRA. The beginning time of autogenous shrinkage of high strength concrete with SAP delays and the shrinkage amount in the first day decreases, which can improve the anti-cracking property of concrete. SAP particles disperse uniformly in hardened concrete. The diameter of the pores in SAP particles formed by the release of water is mainly in a range of 50-70 nm. The porosity of concrete with SAP increases gently, affecting slightly the compressive strength of concrete. ©, 2015, Chinese Ceramic Society. All right reserved.
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页码：363 / 367
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