Fatigue Characteristics of CFRP Sheet Confined Rubber Cement Mortar Under Increasing Amplitude Cyclic Load
YANG Rongzhou1,2, CHEN Peiyuan2, GE Jinjin2, XU Ying1,2,*, WANG Jia2, LIU Jiaxing2, XIE Haotian2
1 State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines, Anhui University of Science and Technology, Huainan 232001, Anhui, China 2 School of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232001, Anhui, China
Abstract: To improve the bearing capacity and fatigue resistance of rubber cement-based materials, cyclic loading-unloading tests of normal rubber cement mortar (N-RCM) and carbon fiber reinforced polymers (CFRP) confined rubber cement mortar (C-RCM) were carried out, and the fatigue damage evolution characteristics of the two specimens were compared and analyzed from the aspects of the load-deformation curve, fai-lure state, deformation, modulus and energy. The results show that compared with N-RCM, C-RCM has ideal toughness and ductility, and its peak load and peak deformation increase by 1.38 times and 2.47 times, respectively. N-RCM shows conventional shear failure, while C-RCM shows instantaneous expansion explosion failure after a large amount of energy storage. Compared with the maximum moduli of loading and unloading of N-RCM, the two of C-RCM increase by 42.32% and 26.19%, respectively. The elastic energy and cumulative damage energy of C-RCM increase by 4.97 times and 45.57 times, respectively, compared with those of N-RCM, indicating that CFRP significantly improves the energy storage and energy dissipation capacity of rubber mortar. The fatigue damage growth rate of N-RCM is significantly higher than that of C-RCM, indicating that CFRP plays a key role in promoting the rubber mortar material to give full play to its structural resistance by increasing the fatigue yield process, and effectively delays the development of fatigue damage. Finally, the difference of fracture mechanism between N-RCM and C-RCM was analyzed and discussed.
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2022, Vol. 36 
