Flexural Tensile Behavior of Interface between Precast and Cast-in-Place UHPC Members Based on Four-Point Bending Test

This paper proposed a new method of exposing fibers using expandable polyethylene (EPE) foam to improve the interface performance. The flexural tensile behavior between precast steam-cured and cast-in-place non-steam-cured ultra-high performance concrete (UHPC) members was examined under four-point bending. improvement effects four non-destructive treatments—e.g., coating with epoxy glue cement-based agent—were experimentally studied for comparison. load-deflection curves specimens were measured, interfaces analyzed, including failure mode, strength, ductility, fracture energy, residual strength. results indicate that strength an without any treatment is low cement or agent has limited effect on improving As result bridging effect, exposed steel can transfer force across interface. Therefore, EPE significantly bond enhancement depends number be simulated based pullout load–slip relationship fiber embedded in UHPC matrix. numerical model used predict fiber-exposing treatment.