STUDY ON MECHANICAL PROPERTIES OF RECYCLED AGGREGATE CONCRETE CONTAINING STEEL FIBERS

The study on steel fiber in concrete had shown considerable improvement in the mechanical properties of recycled aggregate concrete. There were total of 16 batches of concrete mixes M20 and M30 with 0.0%, 0.5%, 1.0% and 1.5% volume of the steel fibers. Water cement ratio of 0.54 and 0.42 for the above two grades of concrete have been used with aspect ratios of 40 and 60. Each batch of concrete has 12 specimens of which 3 cubes, 3 prisms and 6 are cylinders. A total of 192 specimens have been cast for the present experimental program. The overall compressive strength increases 3% and 2% for aspect ratio 40 and 60 respectively.For flexural strength it increases 6% and 2%. In splitting tensile strength increases 8% and 1%. Similarly modulus of elasticity increases from 2% to 1% for both the aspect ratios at 28 days respectively. There is a significant improvement in the properties of concrete when recycled aggregate is used.