MICROMECHANICAL ANALYSIS OF CONCRETE WITH RANDOM MICROSTRUCTURE

Abstract eng:
A model based on the moving window generalized method of cells is presented for the mechanical analysis of concrete microstructure. This model includes debonding between unlike phases to capture aggregate-cement paste interfacial cracking, a phenomenon that is accepted as a major source of nonlinearity in the stress-strain behavior of concrete. The model results in stress-strain responses that are highly dependent on the orientation of aggregate particles within the cement paste matrix. The model is calibrated to a typical concrete stress-strain curve, and used to generate equivalent material property fields for an actual concrete microstructure. Statistical analysis of the resulting data underscores a number of features of the model. The initial elastic modulus is highly dependent on the volume fraction of aggregate in concrete. The post-debonding elastic modulus is dependent on the presence of aggregate-cement paste interfaces in the direction of the applied strain. The model shows significant promise for evaluating the material properties of concrete specimens based on their individual microstructural characteristics.

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