Experimental Study for Shear Behavior of Hybrid Self-Compacting Concrete Beams

Abstract

This paper discusses shear behavior of hybrid reinforced concrete beams that consist of two different concrete layers: the tension layer is made of normal strength concrete with compressive strength of 25 MPa and the compression layer is made of self-compacting concrete with two values for compressive strength of 25 and 50 MPa. These hybrid beams have been compared with corresponding homogenous beams made with one type of concrete to assess their structural behavior. Fifteen simply supported beams have been used and distributed into five groups to investigate the effect of some important variables on the shear strength for each group, (the concrete compressive strengths and the tensile steel ratio). The hybrid beams failed in shear in similar linear behavior to the homogenous beams and the results show that, the ultimate average shear strength of the hybrid beams with self compacting concrete having a compressive strength of 50 MPa [ BHY(50)] is higher than the normal beams by 5.2 % and lower than the self compacting concrete beams having a compressive strength of 50 MPa [BSC(50)] by 12 % , while the ultimate average shear strength of the hybrid beams with normal strength self compacting concrete BHY(25) give approximately close shear strength values of normal beams.