Effect of water-to-cement ratio on internal relative humidity and autogenous shrinkage of early-age concrete internally cured by superabsorbent polymers

被引：19
作者：
Kang, Jiacheng [1 ,2 ,3 ]
Shen, Dejian [1 ,2 ,3 ]
Li, Chengcai [1 ,2 ,3 ]
Li, Ming [1 ,2 ,3 ]
Wang, Xudong [1 ,2 ,3 ]
Hu, Haijiang [1 ,2 ,3 ]
机构：
[1] Hohai Univ, Coll Civil & Transportat Engn, Nanjing, Peoples R China
[2] Hohai Univ, Jiangsu Engn Res Ctr Crack Control Concrete, Nanjing, Peoples R China
[3] Hohai Univ, Nanjing Engn Res Ctr Prefabricated Construct, Nanjing, Peoples R China
来源：
STRUCTURAL CONCRETE | 2022年 / 23卷 / 05期
基金：
中国国家自然科学基金;
关键词：
autogenous shrinkage; concrete; early age; internal curing; internal relative humidity; prediction model; superabsorbent polymers; water-to-cement ratio; HIGH-PERFORMANCE CONCRETE; SUPER ABSORBENT POLYMERS; DRYING SHRINKAGE; LIGHTWEIGHT AGGREGATE; STRENGTH; DEFORMATION; TEMPERATURE; EFFICIENCY; CRACKING; PASTES;
D O I：
10.1002/suco.202100488
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
Self-desiccation is one common phenomenon of concrete with low water-to-cement (w/c) ratios, which may lead to the decrease of internal relative humidity (IRH), and therefore causing autogenous shrinkage (AS). Superabsorbent polymers (SAPs) are used as a kind of internal curing material to mitigate AS of concrete. The IRH and AS are significantly affected by the w/c ratio, and several attempts have been made to investigate the IRH or AS of concrete with different w/c ratios. However, the prediction model of AS considering IRH and w/c ratio of internally cured (IC) concrete is limited. In the present study, the effect of w/c ratio on IRH and AS of IC concrete was investigated, and a two-stage prediction model of AS based on the results of IRH for IC concrete considering the effect of w/c ratio was proposed. The experiment results and analysis indicated that IRH of IC concrete increased as increase of w/c ratio, and development of IRH experienced two stages: a water-vapor saturated stage with 100% RH (stage I), and a gradually reducing stage in which IRH decreased gradually (stage II); critical time of IC concrete increased as increase of w/c ratio; expansion peak of IC concrete increased as increase of w/c ratio; AS and AS rate of IC concrete decreased as increase of w/c ratio; IRH, critical time, and expansion peak of IC concrete were higher than that of ordinary concrete; AS and AS rate of IC concrete were lower than that of ordinary concrete.
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页码：3234 / 3248
页数：15
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