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Effect of fiber type and concrete strength on the energy absorption capacity of fiber reinforced concrete plates under quasi-static bending

Mercan, Ali Macit
With all the known solid advantages of concrete, it has also limitations in its mechanical properties, such as low ductility, tensile strength and energy absorption capacity/toughness. In order to eliminate or minimize these limitations, some developments have been worked up by introducing natural or artificial fibers into the concrete mixture. The main scope of this thesis is to observe the effect of different fiber types and dosages on the performance of two different concrete grades. Two steel fibers with lengths of 30 and 60 mm and dosages of 30, 60, and 90 kg/m3 were used along with one synthetic fiber with a length of 54 mm and dosages of 3, 6 and 9 kg/m3. The performance of the prepared concrete mixtures was measured by the mean of load carrying capacities and toughness through centrally loaded square plates. Three plate specimens were tested for each mixture to obtain the load-displacement data up to a 25 mm displacement deflection. Then, the energy absorption capacity/toughness was determined for each specimen. As a result, it was observed that the addition of fibers increased the ultimate load and energy absorption capacity of the concrete. The test results showed that the increase in fiber dosage leads to increase in crack lengths. Specifically, concrete specimens with steel fibers showed better performance than the ones with synthetic fibers.