AN EXPERIMENTAL INVESTIGATION ON SHEAR BEHAVIOUR OF CONCRETE BY VARYING THE COARSE AGGREGATE SIZE AND ADDITION OF STEEL FIBRE

Dr. B. Madhusudhana Reddy
Assistant Professor, Structural Engineering Division, Department of Civil Engineering, Sri Venkateswara University College of Engineering, Tirupati. , IN

B. Girish
Assistant Professor, Structural Engineering Division, Department of Civil Engineering, Sri Venkateswara University College of Engineering, Tirupati. , IN

Keywords: Mix design, Coarse aggregate, Shear failure, Steel fibre, RC beam, Shear strength, Flexural strength

Abstract

It is well known that coarse aggregate plays an important role in concrete. As coarse aggregate occupies over three-fourth of the volume of concrete and research indicates that changes in coarse aggregate can change the strength and fracture properties of concrete greatly. Aggregate interlocking plays an important role in the shear resistance of Reinforced Concrete(RC) beams without shear reinforcement. Maximum size of aggregate is one of the important parameters for effective aggregate interlocking. Shear failures in concrete structures are very hazardous. These failures being brittle in nature can rarely be predicted and often noticed by rupture. In order to study the shear failure of the concrete beams were cast of grades M20 and M25. The coarse aggregate size 20mm,12.5mm and 20&12.5mm and of steel fibres by varying the percentage 0, 0.25, 0.5, 0.75,1 and 1.25 were varied in different combinations. For most of the combinations shear mode of failure was noticed. The shear mode of failure was resisted greatly at 1% of steel fibre and 20&12.5mm coarse aggregate combinations.

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