Effects of alkali dosage and silicate modulus on alkali-silica reaction in alkali-activated slag mortars

被引：112

作者：

Shi, Zhenguo ^{[1
,2
]}

Shi, Caijun ^{[1
]}

Wan, Shu ^{[1
]}

Zhang, Zuhua ^{[1
,3
]}

机构：

[1] Hunan Univ, Coll Civil Engn, Key Lab Green & Adv Civil Engn Mat & Applicat Tec, Changsha 410082, Hunan, Peoples R China

[2] Swiss Fed Labs Mat Sci & Technol Empa, Lab Concrete & Construct Chem, CH-8600 Dubendorf, Switzerland

[3] Univ Southern Queensland, Ctr Future Mat, Toowoomba, Qld 4350, Australia

来源：

CEMENT AND CONCRETE RESEARCH | 2018年 / 111卷

基金：

中国国家自然科学基金; 澳大利亚研究理事会;

关键词：

Alkali-aggregate reaction; Alkali activated cement; Waterglass; Silicate modulus; Pore solution alkalinity; AGGREGATE REACTION; AMORPHOUS SILICA; PORTLAND-CEMENT; FLY-ASH; CONCRETE; STRENGTH; WATER; EXPANSION; ALUMINUM;

D O I：

10.1016/j.cemconres.2018.06.005

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

The effects of silicate modulus and alkali dosage on alkali-silica reaction (ASR) of alkali-activated slag (AAS) mortars are investigated under accelerated mortar bar testing conditions as specified in ASTM C1260. At a given alkali dosage, an intermediate silicate modulus with respect to highest ASR expansion is observed, which increases from 1.0 to > 2.0 with increase of alkali dosage. The effect of silicate modulus on ASR expansion is found to be governed by the pore solution alkalinity. At a given higher silicate modulus such as 1.5 and 2.0 at 14 day, the ASR expansion tends to increase with increase of alkali dosage, whereas it decreases with increase of alkali dosage at a given lower silicate modulus such as 0-0.5 at 28 day. The mechanism governing the effect of alkali dosage on ASR expansion is more complicated and cannot be explained by only the pore solution alkalinity.

引用

页码：104 / 115

页数：12

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