A Critical Review on the application of coal Bottom Ash inconcrete: An Indian Prospective

Abstract

Coal Bottom Ash (CBA) is one of the by-products of Coal sourced Thermal Power Plants. Unlike Fly ash most of the CBA are dumped as landfills rather than utilized. Replacement of CBA in concrete reduces the burden on waste management and reduces the demand for the river sand and Portland cement. The main and major composition of CBA is Silica hence it has pozzolanic properties. The utilization of CBA in concrete is done by adopting several treatment and process in order to its effective replacement as sand and cement. The process involved in the replacement of cement is Grinding or Pulverization. Pulverization increases the Surface area and fineness of CBA and is comparable with the cement hence pulverized CBA can be used as a cement replacement. Whereas sieving is done to replace as a sand. The focus of this study is to prove that CBA can be used in concrete without any significant loss in the strength, durability properties and the optimum dosage of CBA to improve the performance of the concrete. This review compares the results of several researches on mechanical and durability properties and determine the areas where the research has to be carried out further.