Modeling deterioration of cementitious materials exposed to calcium leaching in non-isothermal conditions

Dariusz Gawin, Francesco Pesavento, Bernhard A. Schrefler

Research output: Contribution to journalArticle

49 Scopus citations

Abstract

The paper presents a new mathematical model of hydro-thermo-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 used instead of an equilibrium curve commonly used in previous isothermal models. This allows taking directly into account the temperature dependence of characteristic times of calcium leaching from different components of concrete what affects the process kinetics, 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 at non-isothermal conditions are discussed. The governing equations of the model and boundary conditions are expressed in terms of the state variables: gas pressure, capillary pressure, temperature, 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 some test problems, are presented.

Original languageEnglish (US)
Pages (from-to)3051-3083
Number of pages33
JournalComputer Methods in Applied Mechanics and Engineering
Volume198
Issue number37-40
DOIs
StatePublished - Aug 1 2009

Keywords

  • Calcium advection
  • Calcium leaching kinetics
  • Hydro-thermo-chemo-mechanical model
  • Non-isothermal conditions

ASJC Scopus subject areas

  • Computer Science Applications
  • Computational Mechanics
  • Mechanics of Materials
  • Mechanical Engineering
  • Physics and Astronomy(all)

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