Dynamic Impact Compressive Behavior Investigation of Sisal Fiber-reinforced Coral Seawater Concrete

Abstract

Split Hopkinson pressure bar (SHPB) was used to investigate the dynamic compressive properties of sisal fiber reinforced coral aggregate concrete (SFCAC). The results showed that, with the increase of strain rate, the dynamic compressive strength, peak strain and toughness index of SFCAC are all greater than its static properties, indicating that SFCAC is a kind of rate-sensitive material. When the sisal fiber was blended, the failure mode showed obvious ductility. At high strain rates, the SFCAC without sisal fiber specimen was comminuted, and the SFCAC showed a “cracked without breaking” state. The results indicated that the sisal fiber played a significant role in reinforcing and strengthening the properties of concrete. The finite element software LS-DYNA was used to simulate two working conditions with strain rates of 78 and 101 s⁻¹. The stressstrain curves and failure patterns obtained were in good agreement with the experimental results.

Keywords

coral aggregate concrete / sisal fiber / dynamic compressive / strain-rate effect