On the Performance Analysis and Environmental Impact of Concrete with Coal Fly Ash and Bottom Ash

Abstract

Coal is a commonly used fuel by coal power plants that produce coal fly ash and coal bottom ash (coal FABA) as byproducts. The latest regulation in Indonesia changes coal FABA classification to non-toxic waste, which opens up its utilization possibility. This paper analyses the coal FABA potential from Suralaya Coal Power Plant as concrete material and its environmental impact. To determine coal FABA potential, the methods used in this paper are slump test, compressive strength test, flexural strength test, and carbon footprint calculation. This paper shows that concrete mixture with coal FABA content has a lower slump value, lower compressive strength, and generally lower flexural strength. Furthermore, the carbon footprint calculation result shows that concrete mixture with coal FABA content has lower CO2 emissions than conventional concrete. Finally, the result shows that concrete with coal FABA could be used as non-structural concrete.

Carbon Emission Optimization of Ultra-High-Performance Concrete Using Machine Learning Methods

“…To achieve ultra-high performance, the usual UHPC compositions employ a lot of cement and other raw materials, which emits 0.68-0.85 tons of CO 2 per cubic meter of materials [16,17]. Although there are many different paths being developed to improve sustainability in the construction industry, the most practical and feasible ones involve minimizing the amount of Portland cement in concrete by replacing it partially or completely with supplementary cementitious materials (SCMs), such as fly ash (FA), silica fume (SF), and ground granulated blast-furnace slag (GGBFS) [18][19][20][21]. Additionally, maximizing the amount of recycled material in concrete can be achieved by replacing coarse aggregates partially or completely with recycled concrete aggregates, recycled glass, and recycled plastic aggregates [22,23].…”