Research on Dynamic Splitting Tensile Mechanical Properties of Carbon Nanofibers Reinforced Concrete

Abstract

The dynamic splitting tensile tests of five kinds of concrete with different content of carbon nanofibers were carried out by split Hopkinson pressure bar (SHPB) device. The dynamic splitting tensile mechanical properties of carbon nanofibers reinforced concrete (CNFC) are analyzed in terms of the relationships between the stress-time curve, dynamic splitting tensile strength, dynamic splitting tensile increase factor (DTF) and the content of carbon nanofibers as well as strain rate. The results show that: the dynamic splitting tensile strength of concrete is enhanced by carbon nanofibers; at the same strain rate level, with the increase of the content of carbon nanofibers, the dynamic splitting tensile strength of concrete shows a trend of first increasing and then decreasing; when the content of carbon nanofibers is the same, as the strain rate increases, the dynamic splitting tensile strength of concrete continues to increase.