COMPRESSIVE STRENGTH BEHAVIOUR OF CONCRETE PRODUCED USING OKIGWE RED LUMP STONE AS COARSE AGGREGATE
CHIOMA TEMITOPE GLORIA AWODIJI(1*), CHINEDU PAUL EZEGO(1), DAVIS OGBONNA ONWUKA(1), STANLEY EMEKA IWUOHA(1)
1. Department of Civil Engineering, Federal University of Technology, Owerri, P.M.B 1526. Imo State, Nigeria *Corresponding author, email: chimbaegbu@yahoo.com
Abstract
This study was carried out in order to ascertain if the Okigwe red lump stone, found in South-eastern Nigeria, could be used as coarse aggregate in making structural concrete. The maximum compressive strength values, obtained at 28 days for red lump stone concrete were 13.72 N/mm2 at w/c ratio of 0.53 for mix ratio 1:2:4 and 8.74 N/mm2 for mix ratio 1:3:6, at w/c ratio of 0.55. These values were not up to 20 N/mm2 which is the ACI 318 (1995) recommendation for structural concrete. Therefore, Okigwe red lump stone must not be used in making structural concrete using mixes 1:2:4 and 1:3:6.