Eight commercial fly ash samples including two from petroleum coke/coal co-firing were
characterized to determine the origin, structure, and properties of the unburned carbon. Because
of its relevance to ash utilization, the characterization included measurements of adsorptivity
toward concrete surfactants, and its dependence on carbon form, particle size, and contact time.
The coal/coke co-firing ashes are observed to possess unique optical and adsorptive properties
which are related to the size, density, and internal porosity of the coke-derived residual char.
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