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Modeling chemical degradations of cement pastes in contact with aggressive solutions: leaching and carbonation



Title: Modeling chemical degradations of cement pastes in contact with aggressive solutions: leaching and carbonation
Author(s): R. Barbarulo
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: 213 - 223
Total Pages: 11
Nb references: 30
Language: English


Abstract: This paper deals with the chemical and mineralogical evolutions of cement paste submitted to two different aggressive solutions: pure and carbonated water. This work has been made possible by recent significant improvement of both cement thermodynamic data and numerical tools.
Strong progress has been made recently in building consistent thermodynamic databases in the field of cement chemistry, which now enable to better model cement paste interactions with external environment.
Numerical tools also have improved, and now make it possible to take into account the chemical and transport aspects of chemical degradation of cementitious materials. The present work uses the models CHESS and HYTEC, coupling ionic diffusion through a porous matrix and chemical equilibria between hydrates and solution. One innovative aspect of this work is that the degree of hydration of cement and the initial porosity of the cement paste are computed by a semi-analytical hydration model developed at the research center and presented in a joint paper.


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