Mechanical Property Test and Finite Element Simulation Analysis of KH-560 Coupling Agent-Modified PVA Rubber Concrete

Abstract

KH-560 coupling agent can significantly improve the cement mortar and the rubber connection interface compatibility problem of poor weak associativity. This is also the problem that rubber concrete cannot be widely used in practical engineering. Therefore, in this study, the improvement of the performance of PVA rubber concrete by the interface modified by KH-560 coupling agent was studied from the aspects of macromechanics, mesostructure, and numerical simulation. The macromechanical test shows that KH-560 coupling agent improves the compressive, flexural, and shear strength of PVA rubber concrete, and the failure mode of the modified PVA rubber concrete also changes from plastic failure to brittle failure. Through FTIR test and SEM observation, it was found that when the rubber concreted is stressed, the PVA fiber and the cement base jointly bear the external force, absorb energy, and play the role of reinforcement. The finite element (ABAQUS) simulation analysis found that the simulated data were similar to the actual test results, and the reliability of the test results was verified by data fitting. The final experimental results of this research have practical guiding significance for the researchers of concrete composite materials to research compression and bending and shearing of test blocks with different dosages. It is used to provide a reliable theoretical basis in the actual engineering.