Comby peyrot, Isabelle (2006) Development and Validation of a 3D Computational Tool to describe Damage and Fracture due to Alkali-Silica Reaction in Concrete Structures. PhD thesis Mécanique Numérique, ENSMP - CEMEF Centre de Mise en Forme des Matériaux, ENSMP.

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Abstract

The Alkali-Silica Reaction (ASR) induces aggregates swelling leading to irreversible degradation of concrete structures. Modelling damage and cracks in a 3D concrete structure submitted to ASR is hence of prime importance in civil engineering. FEMCAM (Finite Element Model for Concrete Analysis Method) software has been developed within this framework to model 3D numerical concrete. In this thesis, we have developed a mesoscale approach where concrete is considered as a heterogeneous material with two main phases: the mortar paste and aggregates. An elastic damage law has been successfully implemented to take into account the mortar paste behavior. The non local Mazars model with an implicit formulation is hence used to deal with damage. This model requires determining elastic and damage parameters. In this way, an experimental campaign has been carried out at the Civil Engineering Department of the Ecole des Mines de Douai to identify concrete material parameters. These experimental results have been compared with numerical ones through the inverse analysis modulus RheOConcrete. Applications on concrete (compression tests, three point bending tests and “Brazilian” splitting tests) have been also performed. The influence of the distribution, diameters and volume of aggregates on concrete behavior has been studied. The comparison between the numerical global responses of a concrete sample submitted to ASR and experimental ones are available. These comparisons are based on previous experimental works carried out at the Ecole des Mines de Douai. It leads to compare numerical and experimental approaches and to better understand the mechanism of ASR under the control of some parameters.

Finally, we have underlined the importance of describing macrocracks in concrete sample with a great accuracy to improve the model. The last part of this project concerns the implementation and the validation of a 3D Discrete Crack Propagation technique to model explicitly 3D crack propagation.

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