Abstract
The dams’ spillway and its stilling basin are the hydraulic structures that are subjected to very fast water flow, which exposes them to the impact of water and water-dragged materials. To produce an appropriate concrete mixture that is capable to resist such loads, three hybrid fiber-reinforced mixes were prepared using the same materials and a constant total fiber volume fraction of 2.5%, while the fiber hybridization scheme was the only variable. All mixtures had a quantity of 0.5% polypropylene fiber (PP) with length of 18 mm. The first mixture (M1) involved 2% steel fibers with length of 6 mm, while M2 contains 2% of 15 mm steel fibers. A quantity of 1% was added form the two steel fibers for M3. The water-jet impact and drop-weight impact tests were conducted to compare the impact response of the mixtures. The obtained results showed that the abrasion resistance of M2 was higher than that of M1 and M3 by 42 and 21%, respectively. Furthermore, its impact resistance was greater than the average value of that for the other mixes by 43.8%. Finally, the splitting tensile strength can be considered an acceptable scale to describe the abrasion resistance of concrete.
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