Influence of lime and coal bottom ash as partial cement replacement material on mechanical properties of concrete

Abstract

Coal bottom ash (CBA) is a waste product collected at the bottom of the furnace from the coal operated power plants. However, its huge production becomes a major environmental issue that will bring a negative impact on the environment as it will lead to a higher risk of groundwater contamination. In this study selected 10% of CBA based on previous studies, but various percentages (5% to 15%) of lime content were used in this study by weight method. The compressive, tensile, and flexural strength tests were performed at 7 and 28days. Based on the results, the workability of concrete showed a reduction when the cement replacement level increased. The compressive, splitting tensile, and flexural strengths were reduced when cement replacement level increase, but the strength was improved with the increase in curing age. However, the concrete with10% CBA indicated higher splitting tensile strength than the control.