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One important factor affecting the resistance and durability loss of concrete structures is acid attack, and one common method of improving concrete properties against this attack is to use high-strength fiber-reinforced concrete. In this study, high-strength concretes containing different percentages of forta-ferro fibers (consisted of synthetic materials in the form of twisted bundle non-fibrillated monofilament and fibrillated polypropylene network) in the presence of silica fume and nano-silica pozzolans were made. After placing the specimens in 5% sulfuric acid for different days of immersion, the effect of adding fibers and pozzolans to the concrete mix on the strength and durability of the high-strength concrete was examined and the relationships between them were determined. Here, ultrasonic pulse velocity (UPV) test was also performed as a nondestructive test to evaluate the quality of high-strength fibrous concrete …