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Experimental study and constitutive modelling of elasto-plastic damage in heat-treated mortar

type de publication      article dans une revue internationale avec comité de lecture
date de publication 2010
auteur(s) Chen Xiaoting; Shao Jian-Fu; Davy Catherine A.; Skoczylas Frédéric
journal (abréviation) International Journal for Numerical and Analytical Methods in Geomechanics (Int J Numer Anal Meth Geomech)
volume (numéro) 34 (4)
  
pages 357 – 382
résumé This study investigates the eff ect of a heat-treatment upon the thermo-mechanical behaviour of a model cement-based material, i.e. a normalized mortar, with a (w/c) ratio of 0.5. Firstly, a whole set of varied experimental results is provided, in order to either identify or validate a thermo-mechanical constitutive model, presented in the second paper part. Experimental responses of both hydraulic and mechanical behaviour are given after di fferent heating/cooling cycling levels (105oC, 200oC, 300oC, 400oC). The reference state, used for comparison purposes, is taken after mass stabilisation at 60oC. Typical uniaxial compression tests are provided, and original triaxial deviatoric compressive test responses are also given. Hydraulic behaviour is identifi ed simultaneously to triaxial deviatoric compressive loading through gas permeability Kgas assessment. Kgas is well correlated with volumetric strain evolution: gas permeability increases hugely when epsilon_v testi fies of a dilatant material behaviour, instead of contractile from the test start. Finally, the thermo-mechanical model, based on a thermodynamics approach, is identi fied using the experimental results on uniaxial and triaxial deviatoric compression. It is also positively validated at residual state for triaxial deviatoric compression, but also by using a diff erent stress path in lateral extension, which is at the origin of noticeable plasticity.
mots clés Mortar; Heat-Treatment; Thermo-Mechanics; Plasticity; Damage; Durability; Gas Permeability
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