Abstract
The results of experimental investigation on the tensile response of UHPFRCs under high stress rates are presented. The dynamic tests are carried out on notched cylindrical specimens using a Split Hopkinson Tensile Bar. The material behavior of UHPFRC and its matrix (UHPC) is investigated at four high stress rates (from 400 to 1000 GPa/s). The rate sensitivity of the UHPFRC and UHPC in tension is evaluated in terms of Dynamic Increase Factor (DIF) of their peak strength. Finally, two different coring orientations on UHPFRC having 3, 4 and 5% fiber content are considered.
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