Experimental Study of the Bearing Capacity of Hybrid Fiber-Reinforced Concrete Pipes

This paper presents the results of an experimental study on hybrid fiber-reinforced concrete pipes (HFRCP). The mechanical behavior of HFRCP, including load capacity, failure mode, and energy dissipation capacity, was evaluated through diametral compression tests. The results were compared with those obtained for reinforced concrete pipes (RCP) using traditional steel cage reinforcement and steel fiber-reinforced concrete pipes (SFRCP). A total of 26 pipes with a 600 mm internal diameter were tested, including 4 RCP, 14 HFRCP, and 8 SFRCP pipes. For the hybrid fiber reinforcement, macro steel fibers (SF) and macro polypropylene fibers (PPF) were used, combined at two different doses: 20-0.5 kg/m 3 and 20-1.0 kg/m 3 of SF and PPF, respectively. The results indicated that HFRCP achieved a load capacity equivalent to RCP and greater than SFRCP for the fiber dosages utilized. Additionally, HFRCP exhibited a ductile failure mode without concrete detachment or diametral crushing.