Numerical investigation on the influence of inclusion shape on concrete drying shrinkage fracture behavior

Abstract

The characteristics of inclusions have a great influence on the fracture characteristics of concrete. In this research paper, a numerical investigation on the influence of inclusion shape on concrete shrinkage fracture behavior is presented. A meso-scale finite element model of concrete is established, considering the three-phase composite structure of inclusions, mortar, and interfacial transition zone (ITZ). An elastic-plastic damage model is used to describe the mechanical behavior of the mortar under drying conditions, while the inclusions are assumed to be elastic. A humidity diffusion model is coupled with the mechanical model to simulate the moisture transport and the shrinkage strain in the concrete. The paper analyzes the effects of different inclusion shapes, such as circular, elliptical, and polygonal, on the crack initiation and propagation in concrete. The results show that the inclusion shape has a significant impact on stress concentration, crack pattern, and crack area of concrete. The paper provides theoretical insights for the prevention and treatment of concrete shrinkage cracks.