Interactions between calcium silicate hydrate (C-S-H) and calcium chloride, bromide and nitrate

The interaction between C-S-H and anions, especially chloride, is already well documented. However, the conclusions vary from one author to another and a comparison of the obtained data is not always possible. Thus, this study aims to clarify this phenomenon and extend it to the case of bromide and...

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Bibliographic Details
Published inCement and concrete research Vol. 90; pp. 89 - 96
Main Authors Plusquellec, Gilles, Nonat, André
Format Journal Article
LanguageEnglish
Published Elmsford Elsevier Ltd 01.12.2016
Elsevier BV
Subjects
Adsorption
Aluminum
Anions
Calcium chloride
Calcium silicate hydrate
Calcium silicates
Chlorides
Filtration
Nitrates
Silicon
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Summary:The interaction between C-S-H and anions, especially chloride, is already well documented. However, the conclusions vary from one author to another and a comparison of the obtained data is not always possible. Thus, this study aims to clarify this phenomenon and extend it to the case of bromide and nitrate. For this matter, a new analytical method has been developed in order to make the measurement directly in synthetic C-S-H suspensions, i.e. without any filtration, after calcium salt addition. Various parameters have been taken into account: the anion type and concentration, the Ca/Si of the C-S-H particles (ranging from 0.8 to 1.42) and the incorporation of aluminum inside the C-S-H structure. It has been found that there is no specific adsorption of chloride, bromide or nitrate by C-S-H. Calcium adsorption, which has been detected and measured, is limited, whatever the initial Ca/Si, and the presence of aluminum does not have any influence on it.
ISSN:0008-8846
1873-3948
DOI:10.1016/j.cemconres.2016.08.002