Abstract：To investigate the bond behavior between carbon fiber reinforced polymer (CFRP) strand sheet and concrete, double-shear tests on a total of 24 specimens divided into eight groups were conducted. The failure modes and strain distribution of each group were observed, and then corresponding failure mechanism at the interface between two kinds of materials was analyzed. The influence on the stress transfer mechanism and bond behavior were evaluated based on different mechanical properties of bond agents and the number of CFRP strand sheet layers. The results show that all specimens tested in this program fail due to the debonding primarily induced by a very thin layer of concrete surface; as the number of CFRP strand sheet increases, the bearing capacity of specimens with the same bond agent increases as well, but both the maximum strain of corresponding CFRP strand sheet and fracture energy drop; the utilization of CFRP strand sheet is the largest among all specimens when epoxy is used as the adhesive; specimens with CFRP strand sheet of single layer, taking polymer cement mortar (PCM) as the bond agent, have superior the ability of resisting debonding, but the utilization of CFRP strand sheet reduce dramatically if the number of CFRP strand sheet layer is 2; a novel bond-slip model, which considers both mechanical properties of bond agents and the number of CFRP strand sheet layers, is established based on the existing bilinear bond-slip model of CFRP sheet-concrete.
潘毅 刘茜 任宇 郭瑞. 基于不同黏结材的CFRP链-混凝土#br#
界面黏结性能试验研究[J]. 土木工程学报, 2021, 54(1): 26-37, 96.
Pan Yi Liu Qian Ren Yu Guo Rui. Experimental study on the bond behavior of CFRP strand #br#
sheet-concrete with different types of bond agents. 土木工程学报, 2021, 54(1): 26-37, 96.
