DENSITY, WORKABILITY AND COMPRESSIVE STRENGTH ASSESSMENT OF STEEL SLAG IN CONCRETE

This study examines the use of Steel Slag (SS) as a partial replacement of coarse aggregate in concrete. The replacement levels of crushed stone (granite) with SS were 0%, 10%, 20%, 30%, 40% and 50%. A total of 72 concrete cubes of sizes 150 mm x 150 mm x 150 mm were cast and cured in water for 7, 14, 21 and 28 days respectively. A mix ratio of 1:2:4 was adopted and batching was done by weight. Slump test were conducted on fresh concrete while density test and compressive strength test was conducted on hardened concrete. The compressive strength result shows that the strength of concrete increases with respect to curing age as the percentage of SS increases (i.e the higher the percentage of SS, the higher the compressive strengths of the concrete cubes). The replacement of coarse aggregate (crushed stone) with Steel Slag (SS) will produce a concrete of higher strength compared to plain concrete (conventional concrete). However, Steel Slag (SS) can successfully be used as a partial replacement of coarse aggregate (crushed stone) in concrete for concrete grade M20 since the strength of concrete with 10%, 20% and 30% 40% and 50% is higher than the control mix.