Abstract: “The problem of shear transfer between different types of concrete surface cast at different ages has been discussed in many researches. Different types of surface treatments and shear connectors were studied experimentally to test their efficiency in what is called the (composite section) which could be formed between a precast beam and cast in place slab. In this research eleven composite concrete-concrete T-section with dimensions (beam 120*400*2000mm and slab 500*100*2000mm) were tested under static concentrated load in the middle of the span, one of them was reference monolithic T-section and the other were with different types of surface treatment like shear connectors with different lengths, epoxy and roughening also the effect of concrete strength was studied to obtain the best way to transfer the shear between concrete layers.”

Keywords: Concrete, Shear Connectors, Pre-slabs, shear transfer, Interface roughness