Effect of modification methods on the mechanical behavior of recycled glass fiber‐reinforced concrete

Abstract To solve the problems of weak bonding between recycled glass fibers (RGFs) and the concrete interface, this paper adopts five modification methods to modify the surface of the RGFs and investigates the effect of these five modification methods on the basic mechanical property tests and micro‐analysis of the recycled glass fibers‐reinforced concrete (RGFRC). The experimental results show that, compared with the unmodified RGFRC, the tensile and compressive strengths of the modified RGFRC are effectively improved. Among these, the aluminum‐zirconium coupling agent has the best modification effect, with the tensile and compressive strengths of the RGFRC increased by 20.9% and 20.7%, respectively. In addition, the results further show that the bonding performance between the RGFs and concrete has been improved, attributed to the fact that the five modification methods improve the mechanical interlocking effect between the RGF and cementitious material through different modification mechanisms.