Study on using coal slag from thermal power plant to replace aggregate in concrete

Abstract

Power plants in operation will discharge a large amount of fly ash and bottom slag, which are hazardous solid wastes that can seriously affect the environment. This study uses thermal power bottom slag to replace sand in the concrete mix composition at a ratio of 25 to 100% by mass. The bottom slag composition has a modulus of magnitude of 1.87; 2.25 and 2.83, respectively, divided into slag groups 1, 2 and 3. Experimental results show that the workability of concrete using bottom slag is sharply reduced when slag is used to replace 25 to 100% in the mix. Concrete slump is sharply reduced by 60% when slag completely replaces sand in concrete. Compressive strength and tensile strength when splitting are reduced by more than 50% when bottom slag is completely used. The value of ultrasonic pulse velocity with slag concrete gradually decreases when using slag due to the reduction in the density of the material structure