In order to evaluate the effects of amorphous metallic fibers and asphalt binder content on moisture-related damage in AC, the TSR was analyzed. The indirect tensile strengths of all test series at dry and wet conditions are summarized in Fig. 10, along with the TSR. A slightly higher tensile strength of 0.76 MPa was obtained in the A-AC specimen with an asphalt binder content of 5.5% compared to the tensile strength (0.73 MPa) of the AC specimen without fibers after dry curing. However, due to the significant decrease of indirect tensile strength of all A-AC specimens after wet curing, much lower wet tensile strengths of all A-AC specimens were obtained in comparison to the wet tensile strengths of AC. Thus, lower TSRs were obtained in all of the A-AC specimens relative to the TSR of the AC specimen without fibers. This indicates that moisture-related damage is more significant in A-AC than in AC due entirely to the inclusion of amorphous metallic fibers. According to the standards of ASTM D4867 [14], the minimum permissible TSR is 0.8 for asphalt mixtures to sufficiently resist moisture related damage. Only the AC specimen without fibers satisfied the requirements of ASTM D4867; however, all of the AAC specimens exhibited a TSR below 0.8. Accordingly, in order to use amorphous metallic fibers in asphalt concrete, additional admixtures to improve resistance to moisture-related damage should be simultaneously used. In the case of A-AC specimens, higher TSRs were obtained in specimens with higher binder contents.