On drying shrinkage in alkali-activated concrete: Improving dimensional stability by aging or heat-curing

被引：188

作者：

Thomas, R. J. ^{[1
]}

Lezama, Diego ^{[1
]}

Peethamparan, Sulapha ^{[1
]}

机构：

[1] Clarkson Univ, Dept Civil & Environm Engn, Potsdam, NY 13676 USA

来源：

CEMENT AND CONCRETE RESEARCH | 2017年 / 91卷

基金：

美国国家科学基金会;

关键词：

Alkali-activated concrete; Drying shrinkage; Autogenous shrinkage; Fly ash; Slag cement; CEMENT-BASED MATERIALS; AGE REACTION-KINETICS; PORTLAND-CEMENT; SLAG CONCRETE; FLY-ASH; PORE STRUCTURE; MICROSTRUCTURAL DEVELOPMENT; ENGINEERING PROPERTIES; AUTOGENOUS SHRINKAGE; PART;

D O I：

10.1016/j.cemconres.2016.10.003

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

The problem of excessive drying shrinkage in alkali-activated concrete (AAC) is well-documented in the literature. The magnitude of drying shrinkage is often three or more times that in portland cement concrete. This study investigates the effects of binder type, activator concentration, strength, age, and curing method on the manifestation of drying shrinkage in alkali-activated fly ash and slag cement concrete. Early-age shrinkage strains in excess of 1200 mu epsilon (0.12 percent strain) are observed in AAC. This is attributed to delayed hydration, microstructure refinement, and strength development. The resulting damage is far more significant than in portland cement concrete. Shrinkage and resulting damage are greatly reduced when specimens are dried at later age and after heat-curing. Alkali-activated slag cement concrete is more sensitive to water loss than portland cement or alkali-activated fly ash concrete. This results from a finer pore structure in alkali-activated slag binders. (C) 2016 Elsevier Ltd. All rights reserved.

引用

页码：13 / 23

页数：11

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