期刊
CONSTRUCTION AND BUILDING MATERIALS
卷 106, 期 -, 页码 512-522出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2015.12.115
关键词
Internal curing; High-performance concrete; Super absorbent polymers; Autogenous shrinkage; Expansion; Prediction model; Internal curing efficiency
资金
- National Natural Science Foundation of China [51578215, 51279051, 51008113]
- open foundation of State Key Laboratory for Disaster Reduction in Civil Engineering of Tongji University [SLDRCE 13-MB-05]
- Fundamental Research Funds for Central Universities [2014807114]
- Special Fund for Water Conservation Research in the Public Interest [201101014, 201401022]
- Chinese Ministry of Water Resources 948 Project [201518]
- Ministry of Housing and Urban-Rural Development of China [2014-K1-060, 2014-K3-011]
High-performance concrete (HPC) is used extensively in practice. However, this type of concrete has a low water-to-cement (w/c) ratio, which causes self-desiccation and leads to a rather high autogenous shrinkage (AS). AS then increases the risk of cracking if the concrete is restrained from shrinking freely at early age. Internal curing (IC) has been extensively used in reducing AS and consequently mitigating the high risk of early-age cracking of HPC. Super absorbent polymers (SAPs) can supply additional IC water for hydration of concrete, thereby counteracting the effects of self-desiccation. Although experimental studies were conducted to mitigate the AS of internally cured concrete with SAP, research on the relationship between the AS of concrete and the amount of IC water provided by SAP is still lacking. Thus, an experimental study on the effect of IC on the early age expansion, AS development, AS rate, and IC efficiency of concrete with SAP was conducted. Test results showed that (1) the early-age expansion occurred obviously prior to the first day for the internally cured concrete, and the maximum expansion increased with the increase of IC water; (2) the ultimate AS at 28 days and AS rate of internally cured concrete decreased with the increase of the amount of IC water; (3) the proposed model to estimate the AS of internally cured concrete with SAP considering the early-age expansion and amount of IC water indicated good correspondence with the experimental results; and (4) the IC efficiency of SAP decreased with the increase of IC water in concrete. (C) 2015 Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据