Dynamic Compressive Behavior of Steel Fiber Reinforced Recycled Aggregate Concrete

Abstract

Steel Fiber Reinforced Recycled Aggregate Concrete (SFRRAC) presents an innovative and sustainable alternative to promote environmental sustainability and resource efficiency.This paper reports an experimental study of the dynamic compressive behavior of SFRRAC with different volume contents under high strain rates (23.9 ~ 96.3s^-1) .The Split Hopkinson Pressure Bar (SHPB) was applied for dynamic impact compression tests at different strain rates and indicated a significant strain rate strengthening effect on the dynamic compressive strength which demonstrated an increase ranging from 10–80% to prove that an increase in steel fiber contents can improve the material compressive behavior. Based on the improved Z-W-T model, the fitting error of the stress-strain curve of recycled concrete under impact load under different steel fiber content and different strain rate was only within 10%, which proved that the model has better fitting ability and can accurately describe the mechanical behavior of steel fiber recycled concrete under dynamic impact. The numerical simulation conducted using ANSYS/LS-DYNA offered a superior representation of the dynamic behavior and performance characteristics of concrete which proved the tendency of internal stress of recycled and the effectiveness and accuracy of impact simulation.