FraMCoS 4 2001 Cachan, France

Fractologicalinvestigations onthefractureinconcrete

The fracture mechanical properties, in particular uniaxial tensile strength fi, Young's modulus Eo and fracture energy Gp as well as the shape of the stress-strain and the stress-deformation relations were investigated for ordinary and high-strength concrete. In order to analyse…

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Year 2001
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Abstract

The fracture mechanical properties, in particular uniaxial tensile strength fi, Young's modulus Eo and fracture energy Gp as well as the shape of the stress-strain and the stress-deformation relations were investigated for ordinary and high-strength concrete. In order to analyse failure mechanisms of these concretes, the roughness and the fractal dimension of the entire fracture surfaces and of their components (fractured aggregate, cement paste and cement paste-aggregate interface) were calculated. These data showed a clear correlation with fracture properties of the concretes investigated. Further, the mechanisms of the transfer of tensile stress across the crack were studied. numerically. Hereby, a new method was applied to generate artificial concrete failure surfaces with a given fractal dimension. The results of the FE simulations confirmed the experimentally found correlations between the condition of the failure surface and the fracture mechanical properties of the investigated concretes.