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Modeling of Short- and Long-Term Chemomechanical Coupling Behavior of Cement-Based Materials

type de publication      article dans une revue internationale avec comité de lecture
date de publication 2014
auteur(s) Hu Dawei; Zhou Hui; Zhang Fan; Shao Jian-Fu
journal (abréviation) Journal of Engineering Mechanics (J Eng Mech)
volume (numéro) 140 (1)
  
pages 206 – 218
résumé The present paper proposes a general framework for the description of short- and long-term behavior of cement-based materials subjected to mechanical loading and chemical degradation. The framework can take into account two different damage mechanisms, mechanical damage and chemical damage, and their interaction also can be considered. A special model is presented for the modeling of leaching-mechanical coupling behavior of fiber-reinforced concrete. The elastic modulus, Drucker-Prager–type criterion, and empirical evolution law of creep strain are related to mechanical damage and chemical damage variables. The evolution kinetic of mechanical damage caused by compression and tensile stress are defined, respectively. The chemical damage is defined with respect to the actual concentration of calcium in the solid skeleton, which is calculated from the mass balance equation of calcium ions. The diffusion coefficient is written as a positive function of mechanical damage variable. The proposed model is implemented into COMSOL Multiphysics and validated from decoupling experiments to fully coupling experiments to progressively determine the model parameters. The proposed model offers an adaptable framework to facilitate description of the chemomechanical coupling behavior of cement-based materials.
mots clés Chemomechanical coupling, Long term, Chemical damage, Cement-based material, Fiber-reinforced concrete
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