The flexural stress versus strain curves of all test specimens are shown in Fig. 14. The flexural tests were carried out using two prismatic specimens with a cross-sectional dimension of 100 50 mm2 and a length of 300 mm for each variable at respective temperatures of 20 C and 10 C. The flexural strengths of all tested beams are summarized in Fig. 15. It was clear that much higher flexural strength values were obtained at the low temperature of -10 C in comparison to the flexural strength values obtained at the moderate temperature of 20 C. This is consistent with findings from the work of Qiu et al. [26], which showed that the flexural strength of cement asphalt mortar almost linearly decreased with an increase in temperature from 30 C to 80 C. The main reason for this observation is that, when sub-zero temperatures are applied, the pore solution freezes, thereby causing volume expansion and filling the remaining pores. Accordingly, the microstructure of AC becomes denser, and its strength increases. A greater amount of brittle failure of AC beams with and without fibers was observed at the low temperature ( 10 C) than at the moderate temperature (20 C), as shown in Fig. 14. These results are similar to the results reported by Xu et al. [27] for fiber reinforced asphalt concrete. However, their research [27] conversely reported that the flexural strength of AC increased with increasing temperature, because the AC mixture was more brittle and susceptible to failure at low temperatures. The brittleness of the AC mixture was verified by comparing the strain capacity (i.e., strain at the peak strength) under flexure (Fig. 15(b)). It was obvious that the strain capacity of AC mixture at the moderate temperature of 20 C was much higher than that at the low temperature of 10 C, because more ductile failure was obtained at a higher temperature. An approximately 6.8 times higher strain capacity was obtained at the higher temperature. At the low temperature ( 10 C), the AC mixture without fibers exhibited the highest strain capacity because, due to the brittle failure and almost elastic behavior up to failure, the strain capacity was dominated by the flexural strength. This means that specimens with higher flexural strength resulted in higher strain capacity. At the moderate temperature of 20 C, however, much more ductile flexural behavior was obtained in all test specimens. Thus, the peak point was also expected to be affected by the fiber bridging. For this reason, the strain capacity of the A-AC mixtures was similar to or slightly higher than that of the AC mixture without fibers.