聚合物砂浆与混凝土抗拉黏结破坏特征

Features of tensile bond failure between polymer mortar and concrete

高强不锈钢绞线网-渗透性聚合物砂浆加固技术是近年来兴起的新型加固工艺。对该加固技术的研究表明:加固层发生剥离破坏是其主要破坏方式之一,如何保证加固层与混凝土界面的黏结性能是加固成败的关键。通过243个测点的正拉黏结强度试验,分析了聚合物砂浆与混凝土界面黏结抗拉破坏的特征,阐述了混凝土强度、界面粗糙度、龄期、修补方位对黏结破坏方式的影响。

Rehabilitation of RC members with stainless steel wire mesh and permeability polymer mortar is a new method of structural strengthening.The research of the method indicates that debonding failure of reinforced layer is one of the main failure modes.The key of the successful re- habilitation is that how to ensure the bond performance between polymer mortar and concrete.The experimental studies on the tensile bond strength between polymer mortar and concrete are carried out, and the features of the tensile bond failure between polymer mortar and concrete are analyzed. The influence of concrete strength, interface roughness concentration, curing age and position of the repaired on the bond failure mode is expounded.