Phase field modeling of rubber-reinforced concrete: A mesoscale finite element approach

This work implements a phase field model to examine the mesoscale mechanical behavior of rubber-reinforced concrete, using a UELMAT subroutine in Abaqus. The modeling involves discretizing four phases: mortar, aggregate, rubber, and their interfacial transition zones. A Python script generates a random distribution of circular aggregates based on a size distribution curve. The study investigates the effect of replacing varying proportions of coarse aggregate with rubber on concrete’s mechanical behavior. A smeared crack propagation method based on the Concrete Damaged Plasticity Model is incorporated, encompassing both the mortar matrix and transition zones. Uniaxial tensile tests were conducted to evaluate the mechanical properties of rubber-incorporated concrete. Comparative analysis includes results from experimental data, an analytical model, and the Concrete Damaged Plasticity Model. The findings demonstrate the phase field model’s potential as a tool for engineering the design of reinforced concrete structures with rubber as an integral aggregate.