Experimental Investigation of the Effect of Partial Replacement of Cement in Concrete with Locust Bean Waste Ash

Afolayan J. O, Oriola F. O. P., Sani, J. E.

The cost of construction material such as cement is high and unaffordable; the need for building construction requiring this material keeps growing, thus the need to find alternative binding materials that can be used solely or in partial replacement of cement. Locust Beam Waste Ash (LBWA) was used as partial replacement of cement in concrete. Concrete cubes were produced using various replacement levels of 0, 5, 10, 15, 20, 25, 30, 35, 40, 45 and 50 percent of OPC with LBWA.  A total of 132 cubes of size 100   100  100mm were produced and cured by immersing them in water for 7, 14, 21 and 28 days respectively. Properties such as compressive strength, density, Standard Consistency, Setting times, Slump and Compacting Factor Test were determined. The result showed that the density of concrete cubes was 2400kg/m3 and compressive strength for 5% increased from 11.67N/mm2 at 7 days to 22.33N/mm2 at 28days curing; the result of 10 – 15% shows significant reduction in compressive strength.