Abstract
To investigate the bonding performance of near-surface mounted (NSM) carbon fiber-reinforced polymer (CFRP) technique under different curing temperatures, a total of five test specimens strengthened with NSM CFRP strip were tested by direct pull-out methods. The strain of CFRP strip, interfacial bonding shear stress, ultimate load and failure mode were analyzed through the test. The experiment results showed that the ultimate load and bonding shear stress of the specimens increased gradually when curing temperature was lower than the glass transition temperature (Tg) of the bond material. Afterward, they gradually decreased with the increase in temperature. The bonding shear stress was gradually transmitted from the loading end to the free end. The failure modes were changed from CFRP strip–adhesive interface bonding failure to CFRP strips fracture failure with the temperature rising. In this paper, the bonding performance experiment results of NSM CFRP strip could provide a reference for the rapid strengthening of monorail traffic track beams.
Highlights
Nowadays, monorail traffic has got widespread attention due to its low noise and adaptability to complex geological environment
The failure modes were changed from carbon fiber-reinforced polymer (CFRP) strip–adhesive interface bonding failure to CFRP strips fracture failure with the temperature rising
To investigate the bonding performance of nearsurface mounted (NSM) CFRP technique applied to concrete block under different curing temperatures, a total of five direct pull-out specimens were carried out considering the effect of curing temperature
Summary
Monorail traffic has got widespread attention due to its low noise and adaptability to complex geological environment. The bonding performance of NSM CFRP technique is more worthy of attention when the curing temperature of adhesive materials is elevated. Many researchers made indepth studies of bonding performance between NSM CFRP and concrete interface at ambient condition. There are few research results on the effect of temperature on the bonding performance between NSM CFRP and concrete. Mohammed [11] investigated the bond performance of NSM CFRP using the high-strength selfcompacting cement base with graphene oxide (IHSSC-CA) as a filling material that was subjected to 400, 600, 700 and 800 °C. The research results of the effect of curing temperature on the bond performance of NSM CFRP were not sufficient. The research results would lay a foundation for using NSM CFRP in rapid reinforcement of monorail track beam
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