The 4th Asian Concrete Federation Symposium on Emerging Technologies for Structural Longevity (ACF2023- ETSL)

40 / 2022-03-24 14:00:23

Investigation on the effect of reinforcement confinement on the mechanical property of ASR damaged concrete by 3D RBSM

alkali-silica reaction,mechanical properties degradation,reinforcement confinement,3D RBSM

Alkali-silica reaction (ASR) is a major durability issue that would induce the deterioration of concrete structures. It causes expansion and cracking in concrete, which would degrade the material properties of concrete. In reinforced concrete structures, the reinforcements could restrain the ASR-induced concrete expansion and change the direction of crack development, which may further affect the material properties of concrete. Studying the effect of reinforcement confinement on the degradation of mechanical properties of concrete suffers from ASR damage is important for further estimating the residual capacity of a structure. In this study, a discrete numerical method, 3-dimensional rigid-body-spring-model (3D RBSM) is used to study the deterioration of the mechanical properties of concrete and the effect of reinforcement confinement. Four cases: compression loading for concrete model without ASR damage and reinforcement confinement, for concrete model without ASR damage but with reinforcement confinement, for concrete model with ASR damage and reinforcement confinement, and for concrete cube with ASR damage but without reinforcement confinement are simulated. It was found that the reinforcement confinement could delay the degradation of the material properties of concrete. Besides, the internal stress condition and crack development is visualized through 3D RBSM, and it was discussed to explain the reason for the increment on concrete strength for ASR damaged concrete with reinforcement confinement.