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Thermal and mechanical bahviour of concrete: Multi-Scale Approach to Thermal Damage: Applications to Concrete at High Temperature

Abstract : This research work deals within the framework of the study of durability when subjected to high temperature in case of fire. The aim of this study is to identify the elementary mechanisms leading the degradation of concretes and to propose a predict model allowing the evaluation concrete damage at high temperature. Adopted step consists to uncoupling the thermal damage, of mechanical origin (accompanied with deformations) and which takes place in the macroscopic and tiny scale, of the thermal damage of physical and chemical origin (not accompanied with deformations) and which is due mainly to the physical and chemical alterations in material. in the general finite element code SYMPHONIE. The validation of the model has been achieved on the basis of several tests issued from the literature. Our approach is based on the exploitation of two different models; the “Digital Concrete” microscopic model and the macroscopic damage deviatoric model MODEV, both implemented in the Finite Elements Software SYMPHONIE. Concurrently, an experimental study was achieved in order to feed and to validate the “Digital Concrete” model. The evolution of mechanical characteristics of concrete was studied using multi-scale approach and three point bending tests were performed on 5 cementeous materials, cement past, mortar, ordinary concrete and 2 HPC concretes, after heating/cooling stage. "Digital Concrete" approach allowed to put in evidence the existence of the micromechanical deformation and to propose an original approach allowing identification by simulation the laws concretes behaviour at high temperatures. This approach was also applied successfully to explain the thermo mechanical experimental observations in concrete behaviour when subject to mechanical load, called collectively «thermal creep transit". An application refractory concrete subjected to very high temperatures was also realized.
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Contributor : Abdellah Menou <>
Submitted on : Friday, April 8, 2005 - 7:19:36 PM
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Abdellah Menou. Thermal and mechanical bahviour of concrete: Multi-Scale Approach to Thermal Damage: Applications to Concrete at High Temperature. Materials. Université de Pau et des Pays de l'Adour, 2004. English. ⟨tel-00008986⟩

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