Review of code provisions and design methods for interface shear bond strength

Structural design of composite precast to in–situ concrete beams and slabs

When two concretes are cast against each other, a bond is formed between the two. The shear strength of this bond is dependent on the transfer of shear stresses between substrate and overlay as a result of four mechanisms, namely: adhesion, mechanical interlock, friction and dowel action [1]. It is known that overlay and substrate characteristics and interface reinforcement influence these mechanisms and hence the shear strength of the bond [2]. In the absence of an adequate bond forming between substrate and overlay, composite action of the two will not develop and the substrate and overlay will behave as two separate elements [3]. Alternatively, if a good bond does form, with significant shear transfer capacity, the components will behave monolithically [4].

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