Impact of Splitting Tensile Properties and Dynamic Constitutive Model of Fly Ash Concrete

Abstract

This paper studies the impact of splitting tensile properties of fly ash concrete with a split Hopkinson pressure bar device. Three different water-cement ratios (0.45, 0.55, and 0.6) and six different fly ash contents (0%, 5%, 10%, 15%, 20%, and 30%) were designed in the experiment. Both quasi-static and impact tests were conducted to study the influence of strain rate, water-cement ratio, and fly ash content on the dynamic mechanical properties of concrete. The test results show that the dynamic splitting tensile strength and dynamic incremental factor of fly ash concrete have an obvious strain rate enhancement effect. Under impact load, the dynamic splitting tensile strength of fly ash concrete with a water-cement ratio of 0.45 and 0.6 achieves its maximum value when fly ash content is 10%, and that of fly ash concrete with a water-cement ratio of 0.55 achieves its maximum value when fly ash content is 5%. Finally, the constitutive model considering dynamic damage was established to fit the test curve. The results show that the constitutive model has a good fitting effect on the test curve.