Electrokinetic potential of hydrated cement in relation to adsorption of chlorides
Electrokinetic potential of hydrated cement in relation to adsorption of chlorides
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DOI：
10.1016/j.cemconres.2009.01.006
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发表时间：
2009-04-01
影响因子：
11.4
通讯作者：
Kurumisawa, K.
中科院分区：
文献类型：
--
作者：
Elakneswaran, Y.;Nawa, T.;Kurumisawa, K.
研究了水泥水合物的表面电荷机理及其与氯离子吸附的关系。水合水泥浆体（HCP）通过解离和吸附表现出净表面正电荷。在HCP中，氯化物以弗里德尔盐的形式结合（化学结合），并吸附在水合物表面（物理结合）。采用表面络合模型预测了氯化物在硅酸钙水合物（C-S-H）上的吸附。氯离子吸附等温线与实验结果吻合较好，表明氯离子吸附在C-S-H表面，并附带表面负电荷（SiOHCl-）。然而，氯离子通过物理吸附使波特兰石和弗里德尔盐的带正电表面中和。从结果可以看出，C-S-H是HCP中氯离子吸附的主要相。爱思唯尔有限公司2009年版权所有版权所有。
in this study, surface charge mechanism of cement hydrates and its relations to adsorption of chloride ions are investigated. Hydrated cement paste (HCP) shows net positive surface charge by dissociation and adsorption. In HCP, chlorides bind as Friedel's salt (chemical binding) as well as adsorb on the surface of hydrates (physical binding). A surface complexation model is used to predict the adsorption of chlorides on calcium silicate hydrates (C-S-H). A good agreement between experimental and predicted chloride adsorption isotherm clearly demonstrate that the chlorides adsorb on the surface of C-S-H and bringing additional negative surface charge (SiOHCl-). However, chloride ions neutralize the positively charged surfaces of portlandite and Friedel's salt by physical adsorption. From the results, it can be concluded that C-S-H is the dominant phase in terms of chloride adsorption in HCP. Crown Copyright (C) 2009 Published by Elsevier Ltd. All rights reserved.