SUITABILITY OF PALM KERNEL SHELLS AS COARSE AGGREGATE FOR STRUCTURAL USE

Abstract

This study looks into the Suitability of palm kernel shells as coarse aggregate for structural use. The tests conducted were sieve analysis, water absorption test, bulk density, specific gravity, slump test and compressive strength. A design mix ratio of 1:3:5 and water-cement ratio of 0.65 were adopted for both PKSC and NWC (Control). Cubes (150mm×150mm×150mm) were cast and cured for periods of 3, 7, 14, 21, 28 and56 days and their densities and compressive strengths were determined. The 28 days average compressive strength of PKSC was found to be 19.80 N/mm2, while that of control was found to be 23.28 N/mm2. The Specific gravities of crushed stone, and Palm Kernel Shell were found to be 2.62 and 1.32 while their bulk densities were 1755 and 632 kg/m3 respectively. Water absorption capacity of palm kernel shell was found to be 21.50%, while that of crushed stone was found to be 0.23% for 24hrs. In conclusion, Palm Kernel Shells Aggregate (PKSA) posse properties that is suitable for Light Weight Aggregate (LWA) and the compressive strength of PKSC which is19.80 N/mm2 is above the minimum recommended by codes for structural Light Weight Concrete (LWC). Hence, PKSC can be used for structural members like beam, slab, and even column. It reduces the cost of construction; pollution associated with waste disposal and enhances infrastructural development.