Three landfill test cells were constructed using AFBC byproducts and Class F coal flyash at a site in central Illinois and were monitored over a five year period as part of a DOE/METC effort to characterize byproducts from clean coal technologies.The field program documented rapid loss of structural integrity in Cell 1,which contained no flyash,whereas Cells 2 and 3 show continued improvement in strength and permeability over time.These observed differences in material behavior are related to loss of soluble minerals from Cell 1 and enhanced silicate reactivity in Cells 2 and 3.Ettringite and thaumasite,minerals associated with failure of Portland cement concrete,do not appear to be the primary causes of Cell 1 deterioration and ettringite remains a primary cement-froming mineral in Cells 2 and 3.
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