Experimental study on interior relative humidity development in early-age concrete mixed with shrinkage-reducing and expansive admixtures

被引：19

作者：

Chen, Shuo ^{[1
]}

Zhao, Haitao ^{[1
]}

Chen, Yu ^{[1
,2
]}

Huang, Donghui ^{[3
]}

Chen, Yuzhi ^{[3
]}

Chen, Xiaodong ^{[1
]}

机构：

[1] Hohai Univ, Coll Civil & Transportat Engn, Nanjing 210000, Peoples R China

[2] Jiangnan Project Management Co Ltd, Hangzhou 310000, Peoples R China

[3] Jinling Inst Technol, Coll Civil Engn & Architectural, Nanjing 210000, Peoples R China

来源：

CONSTRUCTION AND BUILDING MATERIALS | 2020年 / 232卷

基金：

中国博士后科学基金; 中国国家自然科学基金;

关键词：

Relative humidity; Development model; Early-age concrete; Shrinkage-reducing admixture; Expansive admixture; HIGH-STRENGTH CONCRETE; DRYING SHRINKAGE; MOISTURE DISTRIBUTION; AUTOGENOUS SHRINKAGE; CEMENT PASTE; CRACKING; WET; MGO;

D O I：

10.1016/j.conbuildmat.2019.117204

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

Early age concrete may crack due to volumetric shrinkage caused by a decrease in the interior relative humidity (RH) in the self-desiccation process. Shrinkage-reducing admixtures (SRAs) and expansive admixtures (EAs) are utilized to mitigate the volumetric shrinkage. Using a self-developed wireless and automatic relative-humidity monitoring system, a series of experiments for the measurement of the RH within concrete specimens was conducted. A systematic analysis was conducted in the aspects of the setting time, critical time and interior RH development in early-age concrete with different dosages of the polymer-type SRA and CaO-type EA. On the basis, a critical time model and a two-stage RH development model considering the effects of the water to binder ratio, SRA and EA dosages were established. Both of the models are in good agreement with the experimental data. (C) 2019 Elsevier Ltd. All rights reserved.

引用

页数：8

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