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Electrostatic properties of C-S-H and C-A-S-H for predicting calcium and chloride adsorption

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Title: Electrostatic properties of C-S-H and C-A-S-H for predicting calcium and chloride adsorption
Authors: Yoshida, Satoshi Browse this author
Elakneswaran, Yogarajah Browse this author
Nawa, Toyoharu Browse this author →KAKEN DB
Keywords: Adsorption
Calcium-silicate-hydrate (C-S-H)
Zeta potential
Surface complexation model
Issue Date: Aug-2021
Publisher: Elsevier
Journal Title: Cement & concrete composites
Volume: 121
Start Page: 104109
Publisher DOI: 10.1016/j.cemconcomp.2021.104109
Abstract: The adsorption capacity of cement hydrates considerably affects the ionic ingress into cementitious materials. In this study, the surface electrostatic properties of calcium silicate hydrate (C-S-H) and calcium aluminosilicate hydrate (C-A-S-H) were determined to understand the effects of the properties on calcium and chloride adsorption. The density of the surface functional groups was determined by analysing the structure of C-S-H and CASH through Al-27 and Si-29 MAS NMR. The surface sites of SiOH and AlOH are available in CASH whereas C-S-H has SiOH groups for ionic adsorption. We found that the incorporation of aluminium decreases the number of total adsorption sites in C-A-S-H. Furthermore, the site density increased with Ca/(Si + Al). To understand the C-A-S-H/solution interface, a triple-layer surface complexation model was developed and the associated equilibrium constants for depmtonation, calcium, and chloride adsorption were determined by fitting the experimental data of potentiometric titration and zeta potential measurement results. The estimated surface complexation modelling parameters were verified by predicting the experimental data of calcium and chloride adsorption on C-S-H and C-A-S-H.
Rights: © <2021>. This manuscript version is made available under the CC-BY-NC-ND 4.0 license
Type: article (author version)
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: Elakneswaran YOGARAJAH

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