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

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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.
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Issue Date
2018-07
Language
English
Article Type
Article
Keywords

MAS NMR-SPECTROSCOPY; C-S-H; HYDRATED CEMENT; ORGANIC-ACIDS; CONCRETE; ATTACK; RESISTANCE; PASTE; PERFORMANCE; DECOMPOSITION

Citation

CEMENT AND CONCRETE RESEARCH, v.109, pp.81 - 89

ISSN
0008-8846
DOI
10.1016/j.cemconres.2018.03.014
URI
http://hdl.handle.net/10203/243685
Appears in Collection
CE-Journal Papers(저널논문)
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