Experimental Study on Dynamic and Static Tensile Properties of a New Environmental Protection Material

Abstract

Carbon fiber concrete (CFRC), a late-model environmentally protection material, is formed by mixing chopped carbon fibers into concrete. It can raise static tensile strength and deformation resistance with effect. To further explore the safety of CFRC under dynamic load, this paper studies the factors affecting dynamic and static tensile properties of CFRC by using the SHPB device as an experimental means. The stress rate and chopped carbon fiber content are taken as variables to discuss the difference in tensile strength in the two types of load states. Experiment results show more fiber content in the initial stage can raise the static tensile strength of concrete significantly. However, its increase range has a decreasing trend, while the mixing of excessive carbon fiber reduces its dynamic tensile strength. The dynamic mechanical properties rise by adding stress rate, showing an obvious rate effect. There are significant differences in the influence of carbon fiber on the strength of concrete under two load states. Therefore, the carbon fiber content should be properly selected when designing the concrete mix proportion to satisfy different load states under specific working conditions. This paper provides a reference for the design of new environmental protection materials.