A STUDY ON STRENGTH CHARACTER OF SELF COMPACTING CONCRETE WITH FIBRE REINFORCED CONCRETE

A self-compacting concrete (SCC) is the one that can be placed in the form and can go through obstructions by its own weight and without the need of vibration .its first development in Japan in 1988, SCC has gained wider acceptance in Japan, Europe and USA due to its inherent distinct advantages. The major advantage of this method is that SCC technology offers the opportunity to minimize or eliminate concrete placement problems in difficult conditions. It avoids having to repeat the same kind of quality control test on concrete, which consumes both time and labor. Construction and placing becomes faster& easier. It eliminates the need for vibration & reducing the noise pollution. It improves the filling capacity of highly congested structural members. SCC provides better quality especially in the members having reinforcement congestion or decreasing the permeability and improving durability of concrete. The primary aim of this study is to explore the feasibility of using SCC by examining fresh and hardened properties by introducing glass (0.1%) and steel (1.5%) fibers of M40 Grade SCC and comparing the same with M40 Grade Plain SCC. Also, to study the fresh and hardened properties of M80 Grade SCC with varying Packing Factors i.e. 1.12,1.14,1.16,1.18 and comparing the same with M80 Grade conventional concrete When the fiber reinforcement is in the form of short discrete fibers, they act effectively as rigid inclusions in the concrete matrix. Physically, they have thus the same order of magnitude as aggregate inclusions; steel fiber reinforcement cannot therefore be regarded as a direct replacement of longitudinal reinforcement in reinforced and prestressed structural members. However, because of the inherent material properties of fiber concrete, the presence of fibers in the body of the concrete or the provision of a tensile skin of fiber concrete can be expected to improve the resistance of conventionally reinforced structural members to cracking, deflection and other serviceability conditions. Compressive strength of concrete is measured by testing standard cubes (150mm x 150mm x 150mm) at the age of 7 days, 28 days and 90 days, The tests were conducted on varying percentages of steel fibers and studied for their torsional resistance for combined loading under torsion-bending-shear.The existing literature indicates that many researchers have studied the torsional strength, torsion to moment or torsion to shear of steel fiber reinforced concrete beams. However, scanty literature is available on testing of specimen blended with steel crimped fiber and flyash subjected to combined torsion, bending and shear.Hence, by observing the existing literatures, this work is carried out with different percentages of fibers with the inclusion of admixtures to form binary blended concrete to study the behavior of specimen subjected to combined torsion, bending and shear and to achieve the optimum fiber percentage for Binary Blended Fiber Reinforced Concrete Beams