Siliceous and dolomitic-bearing aggregates reaction in Tetramethylammonium hydroxide

被引：7

作者：

Chen, Bi ^{[1
]}

Deng, Min ^{[1
]}

Huang, Xiaojun ^{[1
]}

Mo, Liwu ^{[1
]}

Huang, Bei ^{[1
]}

Lan, Xianghui ^{[1
]}

机构：

[1] Nanjing Tech Univ, Coll Mat Sci & Engn, Nanjing 210009, Peoples R China

来源：

CONSTRUCTION AND BUILDING MATERIALS | 2021年 / 299卷

关键词：

Siliceous; Dedolomitization; Alkali-dolomite reaction; Tetramethylammonium hydroxide; ALKALI-CARBONATE REACTION; ANISOTROPIC ETCHING PROPERTIES; COMPRESSIVE STRENGTH; PYRAMID FORMATION; TMAH; SILICON; CONCRETE; EXPANSION; MORTARS; ACR;

D O I：

10.1016/j.conbuildmat.2021.123948

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

Due to argillaceous dolomitic limestones usually contain more or less quartz or micro-crystalline quartz, based on existence of alkali-silica gels in concretes with dolomitic aggregates, lead to alkali-carbonation reaction (ACR) coexists with alkali-silica reaction (ASR) in concrete. This paper focuses on distinguish ASR are affected by the presence of Tetramethylammonium hydroxide (TMAH) solution to offer a better understanding of the effect of ADR on the mitigation process of alkali-carbonation reaction (ACR). In this work, X-ray diffraction (XRD), laser scanning confocal microscopy (LSCM) and scanning electron micro-scopy (SEM) were carried out analyses of products. The results presented strongly support that the TMAH has no react on reactive silica, and thus stop further attack on the reactive silica by hydroxyl lions. According to the results of the tests, the presence of TMAH is sufficient to promote the ADR in samples with dolomitic aggregates, formation products of brucite and calcite. Therefore, it was concluded that evi-dence to support the theory of TMAH can distinguish ASR and ADR when dolomitic aggregate bearing quartz. (c) 2021 Elsevier Ltd. All rights reserved.

引用

页数：11

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