Evolution of the binder gel in carbonation-cured Portland cement in an acidic medium

被引：60

作者：

Seo, J. H. ^{[1
]}

Park, S. M. ^{[1
]}

Lee, H. K. ^{[1
]}

机构：

[1] Korea Adv Inst Sci & Technol, Dept Civil & Environm Engn, 291 Daehak Ro, Daejeon 34141, South Korea

来源：

CEMENT AND CONCRETE RESEARCH | 2018年 / 109卷

基金：

新加坡国家研究基金会;

关键词：

Portland cement (D); Carbonation (C); Degradation (C); Characterization (B); Acid attack; HYDRATED CEMENT; ORGANIC-ACIDS; CONCRETE; RESISTANCE; ATTACK; PERFORMANCE; PASTE; DECOMPOSITION; DEGRADATION; MECHANISM;

D O I：

10.1016/j.cemconres.2018.03.014

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

The present study investigated the evolution of a binder gel in carbonation-cured Portland cement in an acidic medium. Three types of Portland cement with varying chemical compositions were carbonation-cured and exposed to H2SO4 or HCl. An acid attack induced significant changes in the local environment of Al in normally cured cement showing the formation of ettringite and Friedel's salt, while the local environment of Al in carbonation-cured cement mainly consisted of a tetrahedral aluminate structure and showed much less structural alteration. A thermal analysis showed that the carbonation products of belite were more stable than those of alite, with less gypsum formation under H2SO4 in the cement with relatively more belite. Depolymerization of the carbonation product, Ca-modified silicate gel, was observed in the samples immersed in acid.

引用

页码：81 / 89

页数：9

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