A novel algorithm to model concrete based on geometrical properties of aggregate and its application.

• A novel algorithm is developed to model the aggregates geometrically. • 3D meso-scale concrete model is developed, considering aggregate parameters. • Inclusion of aggregates in mortar, increases the strength of obtained concrete. • In impact loading, mortar and Interfacial transition zone fail simultaneously. • Extent of damage depends on the loading rate. In this paper, a novel algorithm is developed to generate the geometrical model of coarse aggregate based on its physical properties. The size, elongation index, and flakiness index are considered while developing the algorithm. The developed geometrical model of aggregate is further used for generating the finite element (FE) meso-model of concrete. Three distinct phases are considered in the FE model, i.e., aggregate, mortar, and interfacial transition zone. Further, numerical simulation has been performed under different loading conditions (i.e., quasi-static and high-strain loading rate). Additional considerations are discussed to develop a suitable FE model for a 3D split Hopkinson pressure bar specimen. The finite element (FE) simulation results are compared with available literature to verify the developed meso-model. It is verified that the mortar and ITZ fail during the quasi-static loading, whereas the structural effect (lateral inertia confinement) plays a significant role in the high-strain loading rate. [ABSTRACT FROM AUTHOR]