jaue2023027: Effect of Two Kinds of Decarbonized Fly Ash on the Durability of Concrete Mortar Test Block and Net Slurry Test Block

Abstract

Fly ash is a solid waste generated during the coal combustion process, primarily originating from the production and utilization of coal-based facilities in the electricity, heating, and other industries. It constitutes a significant portion of China's industrial solid waste output, given its substantial production volume. Fly ash serves pivotal roles in the construction sector, akin to volcanic ash, and can be employed as a partial substitute for cement in concrete. China predominantly produces two types of fly ash: pulverized coal furnace fly ash (PCFFA) and circulating fluidized bed furnace fly ash (FBFFA). Nevertheless, fly ash often contains a high proportion of the unburned carbon, which can detrimentally impact the quality of cement and concrete materials. Through the flotation process, the unburned carbon content of fly ash can be reduced from less than 2%. This study primarily investigates alterations in the physical and chemical properties of fly ash following a flotation process, alongside changes in microstructure and the durability of fly ash when used as a cement substitute in concrete mortar and net slurry test blocks, hese findings furnish a foundation for the application of decarbonized fly ash in the construction industry.