Roller compacted base course construction using lime stabilized fly ash and flue gas desulfurization sludge-by-product
- Dravo Lime Company Research Center, Pittsburgh, PA (United States)
Dewatered calcium sulfite and calcium sulfate sludges from unoxidized flue gas desulfurization (FGD) processes at coal fired power plants can be mixed with coal fly ash and lime to cause a cementitious chemical reaction used to construct a roller compacted base course (RCFGD) or an impermeable pond liner. The chemical reaction is described as time reacting with alumina from the fly ash which in turn reacts with the calcium sulfite and sulfate FGD waste to form calcium sulfo-aluminate compounds. Leachate data is similar to primary drinking water quality standards. Two field demonstrations of RCFGD and a proposed mix design procedure are described. Factors that affect strength gain and freeze-thaw durability such as optimum moisture content, fly ash to FGD ratio, and age of FGD are discussed. Better understanding is needed on how to predict long term strength performance and expansive potential given the nature of long term hydration forming ettringite compounds and the vulnerability to destructive freeze-thaw cycles.
- OSTI ID:
- 430279
- Report Number(s):
- CONF-960376-; ISSN 0569-3772; TRN: 97:000004-0007
- Journal Information:
- Preprints of Papers, American Chemical Society, Division of Fuel Chemistry, Vol. 41, Issue 2; Conference: Spring national meeting of the American Chemical Society (ACS), New Orleans, LA (United States), 24-28 Mar 1996; Other Information: PBD: 1996
- Country of Publication:
- United States
- Language:
- English
Similar Records
Durability of base course construction using lime stabilized fly ash and flue gas desulfurization sludge by-product
Coolside waste management research. Quarterly technical progress report, April 1, 1993--June 30, 1993