In this contribution, a four-phase micromechanical model is proposed in order to simulate the non-linear instantaneous pre-peak response of cement concrete subjected to monotonically increasing loads. The non-linear behavior is attributed to the creation of cracks in the cement paste of the concrete; the effect of the cracks is taken into account by introducing equivalent voids in the cement paste. The concrete material is modeled as a four-phase composite with three different types of heterogeneities: gravel, sand and voids, embedded in a cement pure paste matrix. The composite homogenization is realized with the Mori–Tanaka method and the overall non-linear response of the concrete is determined by a secant approach. The proposed micromechanical model is able to capture peculiar aspects of the concrete stress–strain curve of uniaxial compression: in most concrete materials, a higher compressive strength is associated with a higher initial tangent Young’s modulus. Further analogies between the theoretical curves of the proposed method and the experimental curves are shown.

Damage mechanics of cement concrete modeled as a four-phase composite

FEO, Luciano;
2014

Abstract

In this contribution, a four-phase micromechanical model is proposed in order to simulate the non-linear instantaneous pre-peak response of cement concrete subjected to monotonically increasing loads. The non-linear behavior is attributed to the creation of cracks in the cement paste of the concrete; the effect of the cracks is taken into account by introducing equivalent voids in the cement paste. The concrete material is modeled as a four-phase composite with three different types of heterogeneities: gravel, sand and voids, embedded in a cement pure paste matrix. The composite homogenization is realized with the Mori–Tanaka method and the overall non-linear response of the concrete is determined by a secant approach. The proposed micromechanical model is able to capture peculiar aspects of the concrete stress–strain curve of uniaxial compression: in most concrete materials, a higher compressive strength is associated with a higher initial tangent Young’s modulus. Further analogies between the theoretical curves of the proposed method and the experimental curves are shown.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11386/4467057
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