Dynamic Compressive Behavior of CTRC and ECC Layered Concrete under Impact Load

摘要

In this study, carbon textile reinforced concrete (CTRC) and engineered cementitious composites (ECC), together with steel fibers, were combined to fabricate two-layer concrete, called CTRC-ECC concrete. The dynamic compressive behavior of CTRC-ECC concrete was studied through the quasi-static compressive test and the impact test using a split Hopkinson pressure bar (SHPB). The effects of the thickness of CTRC, steel fibers, and impact face on the dynamic compressive strength, dynamic increase factor (DIF), strain at peak, and impact toughness of CTRC-ECC concrete were discussed. The results showed that as the thickness of CTRC increased, the dynamic compressive strength followed an increasing trend generally; the DIF decreased; and the strain at peak and the impact toughness increased firstly and then decreased. The addition of steel fibers to CTRC could increase the dynamic compressive strength significantly when the thickness of CTRC is less than 10 mm, improve the impact toughness slightly, but reduce the DIF significantly. In terms of the strain at peak, it firstly increased and then reduced and lastly did not change too much by steel fibers. The effect of impact face on the dynamic compressive strength, DIF, and impact toughness was not significant; however, when the CTRC face was subjected to impact load, the strain at peak could be slightly higher.