Abstract
Flue gas desulfurization (FGD) sludge is a by-product generated by air pollution control systems used in coal-fired power plants. The objective of this work was to stabilize FGD gypsum and FGD filter cake with Class C fly ash. The effectiveness of other additives, such as cement, cement kiln dust, and sialite was also investigated. The chemical, physical, and mineralogical properties of FGD gypsum and FGD filter cake were analyzed. Compaction, California bearing ratio (CBR), and unconfined compressive strength (UCS) tests were conducted on FGD gypsum and FGD filter cake with fly ash. The UCS tests were also conducted on FGD materials stabilized separately with cement, cement kiln dust, and sialite. This study investigated the environmental implications of these two types of FGD by-products with different additives. The test results indicated that both CBR values and UCS for FGD gypsum and filter cake increased with an increase in fly ash contents. FGD gypsum has the potential to be used in geotechnical fill and embankment directly, while FGD filter cake cannot be used directly in pavements without stabilization.
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Schedule a callMore From: Transportation Research Record: Journal of the Transportation Research Board
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