Alkali concentrations of pore solution in hydrating OPC

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Brouwers, H.J.H. and Eijk, R.J. van (2003) Alkali concentrations of pore solution in hydrating OPC. Cement and Concrete Research, 33 (2). pp. 191-196. ISSN 0008-8846

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Abstract:In order to study the pore solution, the release and binding of alkalis in a hydrating cement system have been studied. First, the binding factors for sodium and potassium as determined by Taylor [Adv. Cem. Res. 1 (1987) 5] and the corresponding distribution ratios as determined by Hong and Glasser [Cem. Concr. Res. 29 (1999) 1893; Cem. Concr. Res. in press] are related to each other. It follows that the sorption of sodium is practically identical, whereas for potassium Taylor [Adv. Cem. Res. 1 (1987) 5] predicts a substantial lower degree of sorption. The concept of alkali release, pore solution decrease and sorption by formed calcium-silicate hydrate (C-S-H), is incorporated in the NIST hydration model (CEMHYD3D). Subsequently, the model is compared with ordinary Portland cement (OPC) hydration experiments reported by Larbi et al. [Cem. Concr. Res. 20 (1990) 506]. Good agreement is obtained when the distribution ratios of Hong and Glasser [Cem. Concr. Res. 29 (1999) 1893] are applied. The results suggest that C-S-H is the only binder of alkalis in hydrating OPC.
Item Type:Article
Copyright:© 2002 Elsevier Science
Link to this item:http://purl.utwente.nl/publications/43687
Official URL:http://dx.doi.org/10.1016/S0008-8846(02)01022-0
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