Bottom and Fly Ash as Sand and Portland Cement Filler Replacement in High Volume Concrete

Abstract

AbstractThe effects of coal bottom ash (CBA) as a partial sand replacement and coal fly ash (CFA) as a partial Portland Cement replacement in high-volume fly ash (HVFA) concrete are investigated in this paper. CBA and CFA are waste products from coal-fired power plants worth studying because of the large amount produced each year. Furthermore, this study promotes the use of CBA and CFA in the construction industry to recycle and reuse waste products while reducing the use of river sand, which is becoming depleted, and reducing pollution from Portland cement manufacturing. Because its characteristics are compared to river sand, CBA may be used as a sand substitute in concrete, but CFA can harden concrete during the hydration process. The workability and compressive strength of Fly Ash-Bottom Ash (FABA) Concrete are among the experimental efforts. River sand is replaced with CBA in 10, 20, 30, and 40%, whereas Portland Cement is replaced with CFA 40% of the time. The concrete samples were left to cure for 7, 14, 28, 56, and 91 days. To lower the water-to-cementitious material ratio, high-range water reducers, also known as superplasticizers, are recommended in the FABA concrete samples. The numerical analysis helps to determine the average compressive strength and the optimum CBA replacement percentage by using the results of the failure load from the experiment works. The addition of the superplasticizer to the concrete samples had shown better results in compressive strength and workability.KeywordsCoalFly ashBottom ashConcrete