Abstract
A stabilized waste block, formed by cementation of coal combustion wastes with portland cement and lime, was retrieved after 8-years exposure to a marine environment. The block was analyzed to obtain concentration profiles for major and minor elements. Combination of the major element profiles with semiquantitative X-ray diffraction results allowed identification of diffusion-limited precipitation and dissolution processes. The precipitation and dissolution processes moved as a sharp boundary from the surface toward the center of the block, penetrating about 10-20 mm in the 8 years
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