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Recycled Materials and Byproducts in Highway Applications—Summary Report, Volume 1 (2013) / Chapter Skim
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Pages 13-17

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From page 13...
... 13 background Coal combustion byproducts are generated from the fossil fuel used in electric power generation, which produce about 50% of the electricity demand in the United States. At this time, there are a number of coal combustion byproducts that are marketed for various uses.
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From page 14...
... 14 Condenser Turbine Cooling Water Bottom Ash SCR Air Heater Pulverized Coal Precipitator Or Baghouse FGD Fly Ash FGD Byproduct Gypsum FGD Waste Treatment & Dewatering Stack Flue Gas SCR: Selective Catalytic reduction DeNOx system FGD: Flue Gas Desulfurization System Schematic after Using Coal Ash in Highway Construction: A Guide to Benefits and Impacts. EPA April 2005 (See Next Figure)
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From page 15...
... 15 • HMA QC/QA likely to deal with a larger variability in in-place density when using these byproducts. • Extra testing and monitoring of the optimum moisture content when using byproducts in stabilized soils.
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From page 16...
... 16 • Recycled Materials Resource Center: www.rmrc.unh. edu/ • Turner–Fairbank Highway Research Center: http:// www.fhwa.dot.gov/research/tfhrc/ agency Survey reSuLtS for coaL combuStion byproductS The results showed the main use for Types C and F fly ash is in PCC applications, followed by flowable fill and soil stabilization (Table 1)
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From page 17...
... 17 Coal Combustion Products 2009 Coal Bottom Ash 3 1 1 1 1 MD-3 NJ - 11 1 0 0 3 3 1 7 VT-2 NH- 1 2009 Boiler Slag 2 1 2 1 1 1 1 1 MA-1 NJ - 11 1 0 3 3 VT - 1 2009 Fly Ash, Type C 4 4 4 4 4 3 DE - 3 3 3 3 2 2 2 2 2 2 2 2 1 1 1 NJ - 1 1 1 3 CT - 1 1 1 1 1 4 2 DC - 2 2 2009 Fly Ash, Type F 4 1 1 3 4 2 DE - 3 3 2 3 2 2 1 3 2 2 1 2 1 1 1 NJ - 1 1 1 1 CT - 21 1 1 1 1 2 1 2 4 2 DC - 2MA- 1 NH-1 VT-1 FIGURE 4 Agency survey results for coal combustion byproducts (numbers indicate the number of applications that use the byproduct)
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