on March 31st, 2023

This paper presents an experimental study on the dynamic tensile performance of high-strength concrete reinforced with fibers of different types and contents. In total, five different high-strength concretes with a similar compressive strength of 85 MPa were investigated. One of the five concrete was a plain high-strength concrete (HSC) as control, and the other four (FRHSCs) were reinforced by steel fiber, polyethylene (PE) fiber, or a combination of both. The total fiber content in the four fiber-reinforced high-strength concrete (FRHSC) ranged from 0.5% to 2% by volume. A Split Hopkinson pressure bar facility was used to determine the splitting tensile behavior of the plain high strength concrete and FRHSCs at strain rates from about 1 to 5 s-1. The Dynamic Increase Factor (DIFft), which is the ratio of the splitting tensile strength under dynamic loading to that under static loading, was determined for the five mixtures investigated. A high-speed camera was also used to capture the failure process of the dynamic splitting tensile tests. The results indicate that the DIFft values appear not noticeably affected by the type of fiber used, but the fiber content has a significant effect on the DIFft values. In addition, it is shown that the equations in CEB-FIP 1990 and fib 2010 codes are not applicable for high strength concrete with or without fibers at the strain rates from about 1 to 5 s-1. The transition strain rates of these HSC and FRHSCs seem to be lower than the values of 30 and 10 s-1 recommended by the CEB-FIP 1990 and fib 2010 codes, respectively.

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