Studies on the Effect of Top Bar in Bond Strength of Self-Compacting Concrete [ ]

Self Compacting Concrete is well known for its strength and uniformity. The mechanical properties and bond strength at the steel –concrete interface of SCC varies with its varying mix design. The aim of this paper is to investigate on the bond strength of the top reinforcement and compare with the bond strength of bottom bars in both SCC and VC through pullout tests. For this SCC and VC of compressive strength 40MPa was designed and achieved through proper mix design procedures. The pullout specimen was designed as an integrated composite comprising of both pullout cubes and cubes for compressive strength test at five different levels. The study concludes that the bond transfer mechanism and the top bar effect in self compacting concrete are similar to that of vibrated concrete up to a 500mm height.