STUDY ON DYNAMIC TENSILE BEHAVIORS OF FIBER REINFORCED CEMENTITIOUS COMPOSITES

The dynamic splitting tests with four different strain rates for hybrid fiber (Steel and polyvinyl alcohol (PVA) fiber) reinforced cementitious composites (HFRCC), PVA fiber reinforced cementitious composites (PRCC) and cementitious composites (CC) were conducted using the Split Hopkinson Pressure Bar (SHPB). The dynamic splitting tensile strength, energy properties and the failure modes were analyzed. The results show that HFRCC, PRCC and CC are sensitive to the strain rate, the dynamic splitting tensile strength and energy properties increase with the increasing of strain rate. The splitting strength of HFRCC and the PRCC is 34% and 20% higher than that of CC, respectively. The energy absorption is more sensitive to the strain rate due to PVA fibers. When the content of steel fiber is 25% of all the fibers, the energy absorption of HFRCC is 5% lower than that of PRCC, while as the content increases to 62.5%, the energy absorption is much greater than that of PRCC. Consequently, HFRCC is a better material for the balance of the dynamic splitting tensile strength and energy properties to resist impact loading.