Abstract
The direct tensile stress versus strain responses of ultra-high-performance fiber-reinforced concretes (UHPFRCs) at high strain rates (10–150s−1) were investigated using an improved strain energy frame impact machine. The high strain rates (>100s−1) were achieved by increasing the capacity of the hydraulic jack and coupler and changing the diameter and material of the energy frame. The use of a titanium energy frame (diameter of 30mm) increased the impact speed. As the strain rate was increased from 0.000333 to 170s−1, the post-cracking strength of the UHPFRCs containing 2% straight steel fibers increased from 16.5 to 47.1MPa.
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