Abstract: The restraining and protective effect of carbon fiber cloth on concrete materials can greatly improve their mechanical properties. This paper analyzes the effects of strain rate, number of layers of carbon fiber cloth and concrete strength on the stress-strain curve, peak stress, DIF (dynamic increase factors) and toughness of carbon fiber cloth-constrained concrete based on the uniaxial compression tests with different strain rates using an electro-hydraulic servo press and a split Hopkinson pressure bar (SHPB). The test results showed that the peak stress of the specimens at different strain rates increased with the increase of the number of carbon fiber cloth layers, and the two were negatively correlated as an exponential function. The increase of strain rate makes the specimen DIF increase, and the two are positively correlated as an exponential function, and there is a significant strain rate effect on the specimen. C30 concrete is more sensitive to the strain rate effect of the specimen with the increase of the number of pasted fiber cloth layers, and the degree of influence of the number of carbon fiber cloth layers on the DIF of the specimen decreases with the increase of the concrete strength grade. The increase of strain rate, concrete strength grade and the number of layers of carbon fiber cloth paste increase the toughness of specimens. The restraining and protective effect of carbon fiber cloth can increase the ductility of the specimens and prevent the concrete structure from brittle damage, which is important to enhance the safety of the structure.

Key words: carbon fiber cloth, strain rate, stress-strain curve, peak stress, DIF, toughness, composite material  ,  ,