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Computers and Concrete Volume 1, Number 2, May 2004 , pages 131-150 DOI: https://doi.org/10.12989/cac.2004.1.2.131 |
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A computational setting of calcium leaching in concreternand its coupling with continuum damage mechanics |
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V. H. Nguyen and B. Nedjar and J. M. Torrenti
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| Abstract | ||
| We present in this work a coupled phenomenological chemo-mechanical model thatrnrepresents the degradation of concrete-like materials. The chemical behaviour is described by thernnowadays well known simplified calcium leaching approach. And the mechanical damage behaviour isrndescribed by a continuum damage model which involves the gradient of the damage quantity. Therncoupled nonlinear problem at hand is addressed within the context of the finite element method. For thernequation governing the calcium dissolution-diffusion part of the problem, special care is taken to treat thernhighly nonlinear calcium conductivity and solid calcium functions. The algorithmic design is based on arnNewton-type iterative scheme where use is made of a recently proposed relaxed linearization procedure.rnAnd for the equation governing the damage part of the problem, an augmented Lagrangian formulation isrnused to take into account the damage irreversibility constraint. Finally, numerical simulations arerncompared with experimental results on cement paste | ||
| Key Words | ||
| calcium leaching; continuum damage mechanics; gradient damage formulation; continuumrnthermodynamics; finite element method. | ||
| Address | ||
| ?aboratoire d Analyse des Materiaux et ntification, Institut Navier, 6 et 8, Avenue Blaise Pascal, CiternDescartes, Marne-la-Vallee Cedex 2, Francern?RSN/DIR/Pg, BP 17, 92262 Fontenay-aux-Roses Cedex, France | ||