Research on the interface bonding performance between FRCM and masonry under salt erosion environment

Abstract

Fabric reinforced cementitious matrix (FRCM) has a good application prospect in the field of masonry structure reinforcement. The interface bonding performance between FRCM and masonry is one of the important indicators to evaluate the reinforcement effect of FRCM. There are many studies on the interface bonding performance between FRCM and masonry under normal environment, but few on the interface bonding performance in salt erosion environment, which need to carry out further research. In this paper, based on the single shear test and digital image correlation technology (DIC), the influence of the interface bonding length on the interface bonding performance between FRCM and masonry in a conventional environment was studied and the effective bonding length was determined; the interface bonding performance between FRCM and masonry in the salt erosion environment was studied; the main research factors are the number of dry-wet cycles, the concentration of the salt solution and the types of matrix. Especially, in terms of matrix type, the effects of engineered cementitious composite (ECC) and mortar as FRCM matrix on interface bonding performance are considered. The results show that FRCM, ECC and mortar matrix do not hinder the transportation of salt and cause accumulation at the interface between composite materials and masonry; the slip failure of the textile in the matrix occurs mainly, and the fiber bundles in the matrix are corroded to a certain extent; the interface bonding performance of specimens in the salt corrosion environment using FRCM matrix will reduce, while the specimens using ECC and mortar matrix will improve.