Experimental analysis of the mechanical behavior of hybrid fibers reinforced concrete pipes

Abstract

Concrete reinforced with two or more types of fibers is called hybrid fiber reinforced concrete (HFRCP). In this paper, the mechanical performance of HFRC, steel (SF) and polypropylene (PPF), in their application in 600 mm diameter pipes is evaluated. For it, the bearing capacity and failure mode of HRFH (HFRCP) pipes, elaborated with two different fiber dosages, are experimentally determined by means of the diametral compression test. The results are compared with those obtained from the test of steel fiber reinforced concrete pipes (SFRCP), also elaborated with two different fiber dosages, and reinforced concrete pipes (RCP) with traditional steel bar reinforcement. The HFRCP, with the doses of hybrid fibers used, reached a load capacity equivalent to the RCP and, in addition, they showed a ductile failure mode, without concrete detachment or diametral crushing after failure.