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A development of a multi-species mass transport model considering thermodynamic phase equilibrium



Title: A development of a multi-species mass transport model considering thermodynamic phase equilibrium
Author(s): Y. Hosokawa, K. Yamada, B. Johannesson, L.O. Nilsson
Paper category : conference
Book title: International RILEM Symposium on Concrete Modelling - ConMod '08
Editor(s): E. Schlangen and G. De Schutter
Print-ISBN: 978-2-35158-060-8
e-ISBN: 978-2-35158-076-9
Publisher: RILEM Publications SARL
Publication year: 2008
Pages: 543 - 550
Total Pages: 8
Nb references: 8
Language: English


Abstract: In this paper, a multi-species mass transport model, which can predict time dependent variation of pore solution and solid-phase composition due to the mass transport into hardened cement paste, has been developed. Since most of the multi-species models established previously based on the Poisson-Nernst-Planck theory did not involve modeling of the chemical process, it has been coupled to a thermodynamic equilibrium model in this study. By the coupling with a thermodynamic equilibrium model, the multi-species model could simulate many different phenomena in hardened cement paste such as: (i) variation in solid-phase composition when using different types of cement, (ii) physicochemical evaluation of steel corrosion initiation by calculating the molar ratio of chloride ion to hydroxide ion [Cl-]/[OH-] in the pore solution, (iii) complicated changes of solid-phase composition caused by the penetration of mineral salts during marine seawater exposure conditions. Those phenomena in concrete can be predicted using the coupled multi-species mass transport model and the thermodynamic equilibrium model described in this paper.


Online publication: 2009-06-15
Publication type : full_text
Public price (Euros): 0.00