Fluidized bed combustion bottom ash: A better and alternative geo-material resource for construction

Area of Science:

• Geotechnical Engineering
• Materials Science
• Environmental Engineering

Background:

• Fly ash utilization in construction is established, but bottom ash properties remain less understood.
• Fluidized bed combustion (FBC) bottom ash is gaining interest due to advancements in coal combustion technology.
• Thorough geotechnical and mineralogical characterization is crucial for assessing bottom ash suitability.

Purpose of the Study:

• To characterize FBC bottom ash and compare it with pulverized coal combustion (PCC) bottom ash.
• To evaluate the suitability of FBC bottom ash as a dike filter material, replacing traditional sand.
• To assess the performance of both FBC bottom ash and river sand as filter materials on a pond ash base.

Main Methods:

• Geotechnical characterization of FBC and PCC bottom ash.
• Mineralogical analysis of both bottom ash types.
• Filter material suitability testing using pond ash as a base layer.

Main Results:

• FBC bottom ash exhibits superior geotechnical properties compared to PCC bottom ash.
• Both river sand and FBC bottom ash proved satisfactory as dike filter materials.
• FBC bottom ash demonstrated effectiveness in replacing conventional sand filters.

Conclusions:

• FBC bottom ash is a viable and advantageous geo-material for construction applications.
• FBC bottom ash is a highly recommended alternative filter material for ash dike construction.
• The study supports the use of FBC bottom ash in infrastructure projects, offering an eco-friendly alternative.