THE EFFECT OF PARTIALLY REPLACING CEMENT WITH FLY ASH IN A BEACH WATER ENVIRONMENT
In the quest to produce more environmentally friendly concrete, much attention has been diverted to substituting cement in concrete mixtures with more environmentally friendly ingredients such as fly ash, both in terms of raw materials cost and CO2 footprint. This study aims to analyze the effect of using fly ash as a partial replacement of Portland limestone cement and curing concrete in beach water. Concrete cubes 100 mm x 100 mm x 100 mm were cast using fresh water with 1:1.5:3 mix ratio. All the mixes were prepared using fresh water with cement ratio (w/c) of 0.55 by weight. A total of 96 concrete cubes were cast at 0% (control), 5, 10 and 15% replacement of cement with fly ash. They were cured in fresh and beach water for 7, 14, 28 and 40 days, then tested for compressive strength. The result shows an initial increase in the compressive strength of concrete for concrete specimens cured with beach water at an early age which was more than the concrete specimens cured in fresh water. The result of the research showed that at 40 days the optimum strength was 0% replacement (control) that was cured in river water with value of 34.25 MPa, closely followed by 15% fly ash replacement cured in fresh water with a value of 22.25 MPa. The highest strength for samples cured in beach water was 5% fly ash replacement sample with a value of 18.23 MPa which met the minimum requirement of lightweight concrete within the lower limit of 17.24 MPa in accordance with ACI 213. It is recommended that concrete samples substituted with fly ash can be used for both structural purpose up to 5% replacement and non-structural purpose up to 15% replacement.
Authors : Igba, U.T., Labiran, J.O., Abiola, O.S., Odunfa, S.O., Cosmas, C.A. and Akintola, O.S.
Category : Open Access Volume (Issue) : 9(1) Date Uploaded : 10th May 2023