Study on the bonding performance between reactive powder concrete and steel bar

Abstract

The performance of reactive powder concrete (RPC) is much higher than that of ordinary concrete, and the engineering application is gradually increasing. The bond failure process and bond slip between RPC and reinforcement will show new characteristics. It is necessary to study the bond behavior between RPC and steel bar. The direct drawing test was carried out on the 36 bonding specimens in order to study the bond performance between steel bar and reactive powder concrete. The research shows that the cohesive force consists of three parts: the mechanical bite force produced by the mechanical occlusion between the reinforcing rib and the RPC; The cementing force produced by chemical reaction between RPC component and surface material of reinforcement; Friction between reinforcement and surrounding RPC. The application of ultrahigh strength and various cementitious materials make the Bonding strength between rebar and RPC significantly higher than that of normal concrete. This study can provide reference for the reinforcement anchorage design of RPC structure.

Experimental Research on the Bond Performance between SMAF-ECC Composites and Steel Bar

“…When the rate of increase in pulling force is less than that of the increase in bond area, the average bond stress decreases. Moreover, during the pulling process, the bonding stress between the rebar and matrix is unevenly distributed along the bond length, and this non-uniform stress distribution becomes more pronounced as the bond length increases, ultimately resulting in a reduction in average bond stress [ 38 ]. Additionally, as the bond length is extended, the peak load experienced by the specimen increases, along with an increase in tensile strain at the loading end of the steel.…”

Bonding Properties Between Steel Bar and Reactive Powder Concrete – A Mini-Review

“…The bonding properties between HRB400 and HRB600 steel bars and RPC were examined by Qin using the factors of steel bar strength grade, steel bar diameter, and bond length. The results indicate that bond length is the primary factor affecting bond strength [6].…”

“…The use of fiber bars also slightly increases the bond strength. (6) Steel bar strength. Bond stress increases with the increase of steel strength, on the one hand, because of high strength steel cross rib is higher, on the other hand, high strength steel yield strength is higher.…”