Abstract: To study the dynamic strength and fracture characteristics of CFRP reinforced mortars, dynamic compression tests of normal mortars and CFRP reinforced mortars under different velocities were performed with the 50 mm split Hopkinson bar system. The incubation time criterion acted as a standard to analyze stress rate sensitivity and the increase trend of the instantaneous critical strength of mortar specimens. The results show that, within the range of the tested stress rate, the tested dynamic strengths of normal mortars and CFRP reinforced mortars increases with stress rate, while their critical time decreases with it. The critical time of CFRP reinforced mortar lags 9—61.7 μs, compared with that of normal mortar, and the greater the stress rate is, the smaller the extent of the critical time lag is. The incubation time of normal mortars and CFRP reinforced mortars are 54.2 μs and 72.1 μs respectively, indicating that their dynamic enhancement effects of stress are different, and the dynamic enhancement effect of CFRP reinforced mortars is more significant than that of normal mortars. The layered fracture of CFRP reinforced mortar spe-cimens appears, and with the increase of stress rate, the fracture characteristics of CFRP reinforced mortar specimens are gradually close to that of ordinary mortar.
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2022, Vol. 36 
