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Models for chloride ion bindings in hardened cement paste using thermodynamic equilibrium calculations



Title: Models for chloride ion bindings in hardened cement paste using thermodynamic equilibrium calculations
Author(s): Yoshifumi Hosokawa, Kazuo Yamada, Björn F. Johannesson, Lars-Olof Nilsson
Paper category : conference
Book title: 2nd International RILEM Symposium on Advances in Concrete through Science and Engineering
Editor(s): J. Marchand, B. Bissonnette, R. Gagné, M. Jolin and F. Paradis
Print-ISBN: 2-35158-003-6
e-ISBN: 2351580028
Publisher: RILEM Publications SARL
Publication year: 2006
Nb references: 17
Language: English


Abstract: This study was conducted to develop the method having capability to reproduce the behavior of chloride binding in hardened cement paste using PHREEQC based on thermodynamic equilibrium. By adopting the surface complexation model for the ion binding onto the surface of C-S-H, the equilibrium constants of the reaction of Na+, K+, Cl?, SO42? were derived from the sorption experimental data in the previous literature. For the formation of Friedel’s salt, which is considered as the chloride binding by AFm, ion exchange reaction was adopted, and the equilibrium constant of the reaction was determined from the chloride sorption experimental data obtained previously. Since the measurement results about the amount of bound chloride and formed hydrates in hardened cement paste were reproduced correctly by these models, it was made clear that the models based on thermodynamic equilibrium in this study are valid to predict the binding phenomena in hardened cement paste.


Online publication: 2006-08-02
Classification: 3.1 Theme 1: Numerical Models: from Microstructure to Transport Properties and Durability
Publication type : full_text
Public price (Euros): 0.00
doi: 10.1617/2351580028.025