Abstract
After the complaints from Japans people from, the noise of mechanical vibrators used in compaction of concrete and also the workers' complaints of frequent unhealthy use of vibrators, and with the difficulty of compaction structural elements with heavy reinforcement and limited sections needed to find an alternative way to overcome these problems. This led to the discovery of Self compacting concrete (SCC) in 1988; this concrete has a high workability which can be compacting under its own weight without any need of mechanical vibrator and without segregations. In spite of the multiplicity of research and studies conducted in the field of SCC, the effect of the components of the mixture on the shear strength of the SCC using local materials which encourages study of this subject and find a mathematical model with compressive strength. So it’s needed to study shear strength of SCC. A new formula for shear force in the RC section with SCC is required. There are differences in results related to mechanical properties such as tensile, compressive and impact strength, as well as modulus of elasticity between the SCC and normal concrete. The focus of the study is to replace part of the coarse by crushed aggregates with (W/C=0.45), (A/C=3.5), and MVA 0.54 % of cement. The resulting compressive strengths were between (50 65 MPa). From test results, the shear and compressive strength relationship has a clear relation as: σShear= 0.0755fc\ + 0.5405 with a ratio of crushed to coarse aggregate 5 %.