This work presents the mechanical and durability evaluation of high-performance concrete mixes used for tunnels after exposure to different temperatures. Nine HPC mixes were investigated. The first group has W/C ratios; of 0.25, 0.31, and 0.37. The second group has silica fume addition by about 5.0%, 10%, and 15% of cement weight. In the third group, polypropylene fibers were added to the concrete by the ratios of 0.211% from the concrete volume. The mechanical properties were measured at room temperature and after exposure to temperatures 400°C and 800°C for curing periods of 28 and 56 days. The durability was evaluated by water penetration depth at room temperature. Scanning electron microscopes were also carried out. The results indicate that at a temperature of 400°C, the compressive strength of the concrete increased. They decreased with further increases in temperature over 400°C to 800°C. At 400°C, the highest compressive strength improvement is achieved by about 18.2% after 56 days of curing in the case of 10% SF The addition of 0.211 polypropylene fibers significantly increased the compressive strength after curing for 56 days by about 32.1%. Moreover, at 800°C, the highest tensile strength improvement achieves by about 87.5% after curing for 56 days in the case of SF=10%. The lowest porous penetration depth of water was found for a mix containing W/(C+SF) = 0.37, silica fume =10%, and polypropylene fibers =0.211%.