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Coupled Mechanical and Chemo-Transport Model for the Simulation of Cementitious Materials Subjected to External Sulfate Attack

  • B. Bary
  • N. Leterrier
  • E. Deville
  • P. Le Bescop
Chapter

Abstract

We propose in this study to develop a chemo-transport-mechanical model for the simulation of external sulfate attack (ESA) in cementitious materials. This degradation mainly consists in the hydrate decalcification/dissolution due to leaching and in the reaction between the sulfate ions migrating within the material and monosulfate initially present to precipitate into ettringite. It may generate macroscopic expansions leading to severe microcracking. The key point in this study is the use of the integration numerical platform ALLIANCES which couples a code solving the chemical equations, the diffusion of ionic species into the porosity, and the mechanical problem. The crystallization pressures resulting from the interaction between growing monosulfate crystals and the surrounding C-S-H matrix are assumed to cause the observed macroscopic swelling. A macroscopic bulk strain tensor calculated from the volume of formed ettringite is introduced for directly reproducing these expansions. Explicit upscaling techniques applied on a simplified representation of the materials allow estimating both mechanical and diffusive properties of the evolving microstructure. Finally, simulations of laboratory tests investigating the effects of ESA on mortar specimens are performed and analyzed. Comparison of the numerical results with experimental ones is performed and discussed.

Keywords

Cementitious Material Interfacial Transition Zone Cement Particle Mortar Specimen Crystallization Pressure 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

AREVA NC is gratefully acknowledged for financial support.

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Copyright information

© Springer Science+Business Media New York 2013

Authors and Affiliations

  • B. Bary
    • 1
  • N. Leterrier
    • 1
  • E. Deville
    • 1
  • P. Le Bescop
    • 1
  1. 1.DEN/DANS/DM2S/SFMECommissariat à l’Energie Atomique et aux Energies AlternativesGif-sur-YvetteFrance

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