Investigation on the Mechanical and Structural Behaviour of Eco Friendly Recycled Concrete Aggregates Based Self Compacting Concrete in Beam Column Joints

Abstract

newline The thesis presents Experimental and Numerical investigation on the behaviour of concrete beams prepared using reinforced concrete as well as with steel fibre. The length of the beam was 1150 mm , width 150 mm and depth 150mm. The size of the conventional slender beam was 2000 mm × 125 mm × 200 mm. On the tension side, traditional beams were reinforced with 12 mm steel bars as secondary reinforcement and 16 mm steel bars as main reinforcement. The plain concrete was reinforced with 0.5 mm diameter fibres in respect of both categories of beams. The hooked end steel fibre of 30 mm length and aspect ratio of 50 were used. Concrete materials were weigh batched and mixed using a proportion according to IS10262:2019 with w/c of 0.50 in a mechanical mixture to achieve a characteristic compressive of M30. The specimens were cured for 28 days. The Total beam specimens of 15, cube specimens of 7 were casted using self compacting concrete. Three types of beam joints specimen are casted. Each type comprises of five specimens respectively. Beams of Cross joint (A series), T joint (B Series), L joint (C Series) were fabricated. Those combination of beams were casted with conventional concrete (TAN, TBN, TCN), concrete replaced with 30% of coarse aggregate with recycled aggregate ( TAC, TBC, TCC), Concrete replaced with 30% of coarse aggregate with recycled aggregate and added with 0.5% of steel fibre (TAF1, TBF1, TCF1), concrete replaced with 30% of coarse aggregate with recycled aggregate and added with 0.75% of steel fibre (TAF2, TBF2, TCF2), concrete replaced with 30% of coarse aggregate with recycled aggregate and added with 1% of steel fibre (TAF3, TBF3, TCF3). The specimens were tested using point loading of 25 tonne capacity UTM. The beams were arranged in a UTM with bending bench for testing with one end hinged and the other mounted on roller to achieve simply supported end condition with constant load of 150 kN in the vertical ends. The dial gauges were placed at the mid span and under load points. newline newlineExp