Experimental investigation on sing fiber pullout behaviour on steel fiber-matrix of reactive powder concrete (RPC)

A new single fiber pullout testing method was applied to characterize the interfacial bond performance, which includes load-slip relationship, energy, strength, and utilization ratio, of steel fiber-matrix in reactive powder concrete (RPC). The properties strengthening mechanism were investigated from perspective certain parameters, including type, embedment angle, silica fume content, magnetic nanoparticles curing time. microstructure longitudinal morphology tunnel after test determined by scanning electron microscope (SEM). In terms results, strength end-hooked is much stronger than that straight fiber. With increasing ultimate load energy fibers increase, increases. It found incorporation can effectively enhance matrix strength. addition, RPC containing 20%∼30% shows significant improvement behavior. appropriate age contributes greatly hydration reaction RPC. Steaming for 2 d improve performance. content 1% enhances behavior with no brass coating, because maximum increase 33.6% 79.0%, respectively. microstructural observations confirm conclusions regarding drawn tests. conclusion, performance matrix, characteristics interface area friction influence