Bond behavior between basalt fiber reinforced polymer sheet and concrete substrate: Effects of elevated temperatures and sustained load

This paper presents the effects of elevated temperatures and sustained load on the bond behavior between basalt fiber reinforced polymer sheet and concrete substrate. Three test replicates were performed through a single lap shear bond test. The temperatures were ranging from room temperature to 60 °C with the interval of 10 °C, and the sustained load was set as 35% peak load of the control specimens. Specimens with sustained load were exposed to elevated temperatures up to 3 h, and the failure test was performed at the elevated temperatures. Sustained load at elevated temperatures shows a significant effect on the bonding behavior. The specimens exposed at 30, 40, 50 and 60 °C increased the peak load by 9.6%, 31.2%, 29.6% and 20.2%, respectively. It was recognized that the shear stress redistributed at the concrete-BFRP interfaces during the test. The failure mode changed from concrete cohesion to adhesive failure with the increase of the temperatures. The variation of the failure patterns is attributed to the softening of the adhesion bond at elevated temperatures.