UHPC加固修复复合试件界面黏结性能影响因素研究OA

The bonding performance between UHPC(ultra-high-performance concrete)and existing concrete substrates is a critical factor in structural reinforcement and repair.This study experimentally investigates the effects of failure mode,matrix strength,interfacial roughness,and curing age on splitting tensile strength and double-sided shear strength,while analyzing the micro-mechanisms of the interfacial roughness group.Results indicate that:failure primarily occurs through interfacial de-lamination;increased matrix strength and curing age significantly enhance interfacial bond strength;interfacial bond strength continuously increases with rising interfacial roughness but stabilizes beyond RO2;top-pouring methods yield higher bond strength than side-pouring;the RO2 group achieves optimal interfacial bonding performance by balancing mechanical inter-locking and chemical bonding through moderate roughness,forming a dense interfacial transition zone.