Influence of Loading Rate on the Fracture Behaviour of Steel Fiber-Reinforced Concrete (original) (raw)

Three-point bending tests on notched beams of steel fiber-reinforced concrete (SFRC) have been conducted using both a servo-hydraulic machine and a self-designed drop-weight impact device. The shape and geometry of the specimen followed the RILEM recommendation, i.e., 150 mm × 150 mm in cross section, 700 mm in length, notch-depth ratio was around 1/6 and span was kept constant 500 mm. The peak load and the fracture energy were measured over a wide range of loading rates (loading point displacement rates), spanning six orders of magnitude. Under low loading rates, from 10 -3 mm/s to 10 0 mm/s, the tests were performed with the servo-hydraulic machine; from 10 2 mm/s to 10 3 mm/s, the drop-weight impact machine was used instead. The results show that the fracture energy and the peak load increase as the loading rate increases. Furthermore, such a trend is relatively mild under low rates. The gain of the fracture energy and peak load is around 10% compared with its quasi-static values...

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