Reactivity of reclaimed concrete aggregate produced from concrete affected by alkali-silica reaction

被引：42

作者：

Shehata, Medhat H. ^{[1
]}

Christidis, Chris ^{[2
]}

Mikhaiel, Waleed ^{[1
]}

Rogers, Chris

Lachemi, Mohamed ^{[1
]}

机构：

[1] Ryerson Univ, Dept Civil Engn, Toronto, ON, Canada

[2] Lafarge Ctr Res, St Quentin Fallavier, France

来源：

CEMENT AND CONCRETE RESEARCH | 2010年 / 40卷 / 04期

基金：

加拿大自然科学与工程研究理事会;

关键词：

Alkali-Aggregate Reaction; Reclaimed concrete aggregate; Fly Ash; Lithium Compound; SEM; UNIVERSAL ACCELERATED TEST; FLY-ASH COMPOSITION; CEMENTING MATERIALS; RECYCLED CONCRETE; PORE SOLUTION; EXPANSION; CHEMISTRY; PASTES; FUME; SLAG;

D O I：

10.1016/j.cemconres.2009.08.008

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

This paper presents results from a research program that focused on studying the reactivity of reclaimed concrete aggregate (RCA) produced from concrete affected by alkali-silica reaction (ASR). The results showed that RCA produced from ASR-affected concrete causes significant expansion when used in new concrete. The expansion was similar to that produced in concrete containing the reactive aggregate used originally in the old concrete. It is believed that crushing the old concrete exposed fresh faces of the reactive aggregate which causes renewed reaction and expansion in the new concrete. The alkalis contributed from the RCA are also believed to contribute to the expansion. The amount of supplementary cementing materials required to mitigate the expansion in new concrete containing ASR-affected RCA was higher than those normally needed in concrete containing the virgin reactive aggregate. The results showed a good agreement between the 14-day expansion of accelerated mortar bars and the expansion of concrete prisms. (C) 2009 Elsevier Ltd. All rights reserved.

引用

页码：575 / 582

页数：8

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