Bond properties of reinforcement anchored in reactive powder concrete flexural members

Abstract:

Bond properties between reactive powder concrete and steel bar are studied through beam bond tests, and compared with C40 concrete. It is showed that, the bond stress-slip curve tendency of the two concretes is similar, and the compressive strength and bond strength of reactive powder concrete are much larger than that of C40 concrete. The ultimate bond stress of reactive powder concrete τu is about three times of C40 concrete, the responding slip su is about twice of that of C40 concrete, and the relative bond strength τu/fcu is about 1.6 times of that of C40 concrete. The bond mechanism between reactive powder concrete and steel bar is analyzed according to the test curve and failure mode, at the same time, an empirical formula including multifactor are established through statistical regression, and a simplified four-line bond stress-slip model is established that can provide a reference for engineering design.