LAUSR

Abstract The paper shows three-dimensional numerical results regarding concrete fracture at aggregate level in a notched concrete beam under bending using cohesive interface elements. Concrete heterogeneity was taken into account by considering a 3-phase material description: aggregate, cement matrix and interfacial transitional zones (ITZs). The real shape and location of aggregate particles in concrete were assumed in numerical analyses based on X-ray μCT scans. The 3D meso-scale finite element method (FEM) with cohesive elements embedded in the cement matrix and ITZs was used in simulations. The effect of different properties of ITZs and cement matrix was investigated in parametric studies. A satisfactory agreement in terms of the vertical force versus crack mouth opening displacement evolution and crack geometry was achieved between analyses and laboratory tests.