Abstract; This paper investigates the effects of Fly-ash on the compression and splits tensile strength of concrete . Concrete mix of grade M20 was tested . The cubes of size 15cmx15cm and cylinders specimens of size 15cm diameter and 30cm length are cast to test for compression and split tensile strength respectively and compared with the control specimens. Fly-ash and Cinder was used as a partial replacement for cement and coarse aggregate in normal strength concrete at 10%, 20%, 30% by weight and cinder by 20%,40%,60% by weight. The slump cone test and compaction factor tests were carried out to check the effect of Fly-ash on the workability of concrete. The increment in the cement substitution by Fly-ash caused decreasing the workability of concrete. It showed a 48% reduction of workability with 30% replacement as compared to plain concrete in the slump cone test. The optimum dosage of fly-ash for the compression strength and splitting tensile strength is 20% .

Keywords: Light weight concrete, Workability, Compression strength, Split tensile strength.

| DOI: 10.17148/IARJSET.2022.9742