TY - JOUR
T1 - Modeling of cementitious materials exposed to isothermal calcium leaching, considering process kinetics and advective water flow. Part 1
T2 - Theoretical model
AU - Gawin, Dariusz
AU - Pesavento, Francesco
AU - Schrefler, Bernhard A.
N1 - Funding Information:
This research was carried out as part of the project ‘Mathematical-Numerical modeling of the short-long term behavior of cement based materials’ (prot. 60A09-8287/07) 1111 2222 at the University of Padova, Italy. The research was also partly supported by the Polish Ministry of Science and Higher Education, project No. 4 T07E 032 30 ‘Modelling stresses and degradation of external layers of building walls exposed to variable conditions of internal and external climate’ at the Technical University of Lodz, Poland.
Copyright:
Copyright 2008 Elsevier B.V., All rights reserved.
PY - 2008/12/15
Y1 - 2008/12/15
N2 - Part 1 of the paper presents a new mathematical model of hydro-chemo-mechanical behavior of cementitious materials exposed to contact with the deionized water. For analyzing the calcium leaching process, an equation describing kinetics of the process is proposed instead of an equilibrium curve commonly used in previous models. This allows taking directly into account the characteristic time of calcium leaching which affects the time evolution of the process, especially that with a relatively fast decrease of the concentration of calcium in pore water. Constitutive relationships describing the transport and strength properties of concrete during chemical degradation are discussed. They are expressed in terms of the leaching degree, an internal variable of the model describing the material decalcification. The governing equations of the model and boundary conditions are expressed in terms of the state variables: gas pressure, capillary pressure, calcium concentration and displacement vector. Numerical solution of the model equations with the finite element method, as well as several examples of application of the model for analysis of various problems, are presented in the part 2 paper.
AB - Part 1 of the paper presents a new mathematical model of hydro-chemo-mechanical behavior of cementitious materials exposed to contact with the deionized water. For analyzing the calcium leaching process, an equation describing kinetics of the process is proposed instead of an equilibrium curve commonly used in previous models. This allows taking directly into account the characteristic time of calcium leaching which affects the time evolution of the process, especially that with a relatively fast decrease of the concentration of calcium in pore water. Constitutive relationships describing the transport and strength properties of concrete during chemical degradation are discussed. They are expressed in terms of the leaching degree, an internal variable of the model describing the material decalcification. The governing equations of the model and boundary conditions are expressed in terms of the state variables: gas pressure, capillary pressure, calcium concentration and displacement vector. Numerical solution of the model equations with the finite element method, as well as several examples of application of the model for analysis of various problems, are presented in the part 2 paper.
KW - Calcium advection
KW - Hydro-chemo-mechanical model
KW - Leaching kinetics
KW - Leaching of calcium
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U2 - 10.1016/j.ijsolstr.2008.07.010
DO - 10.1016/j.ijsolstr.2008.07.010
M3 - Article
AN - SCOPUS:54149085527
SN - 0020-7683
VL - 45
SP - 6221
EP - 6240
JO - International Journal of Solids and Structures
JF - International Journal of Solids and Structures
IS - 25-26
ER -