Experimental study and constitutive modelling of elasto‐plastic damage in heat‐treated mortar |
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| Authors: | Xiao‐Ting Chen J F Shao C A Davy F Skoczylas |
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| Institution: | 1. Laboratoire de Mécanique de Lille, UMR CNRS 8107, and Ecole Centrale de Lille, Cité Scientifique, BP 48, 59651 Villeneuve d'Ascq, France;2. Laboratoire de Mécanique de Lille, UMR CNRS 8107, and Polytech'Lille, Cité Scientifique, 59650 Villeneuve d'Ascq, France |
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| Abstract: | This study investigates the effect 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. First, 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 different heating/cooling cycling levels (105, 200, 300, 400°C). The reference state, used for comparison purposes, is taken after mass stabilization at 60°C. Typical uniaxial compression tests are provided, and original triaxial deviatoric compressive test responses are also given. Hydraulic behaviour is identified simultaneously to triaxial deviatoric compressive loading through gas permeability Kgas assessment. Kgas is well correlated with volumetric strain evolution: gas permeability increases hugely when εv testifies of a dilatant material behaviour, instead of contractile from the test start. Finally, the thermo‐mechanical model, based on a thermodynamics approach, is identified 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 different stress path in lateral extension, which is at the origin of noticeable plasticity. Copyright © 2009 John Wiley & Sons, Ltd. |
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| Keywords: | mortar heat‐treatment thermo‐mechanics plasticity damage durability gas permeability plastic damage heating thermal effects |
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