Method of resisting corrosion in metal reinforcing elements...

Compositions: coating or plastic – Coating or plastic compositions – Inorganic settable ingredient containing

Reexamination Certificate

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C106S641000, C106S642000, C106S643000, C106S644000

Reexamination Certificate

active

07101429

ABSTRACT:
The present invention provides methods for resisting corrosion of metal elements in concrete, and associated compounds and structures. Acid mine drainage sludge is used as a source of a precursor compound that reacts with a source of anion to form a chloride-sequestering compound. The precursor compound may have the formulain-line-formulae description="In-line Formulae" end="lead"?2Me′(II)O·(Y(2−x),Y′x)O3+qMe′(II)O,in-line-formulae description="In-line Formulae" end="tail"?where at least one of Y and Y′ is present; Y and Y′ are different and are independently selected from the group consisting of Al, Fe, Cr, and not present; Me′ is a cation and is selected from the group consisting of Ca, Ba, Sr, Mn, and Zn; x is a number ranging from 0 to 2; and q is a number ranging from 0 to 2; and combinations thereof. In a preferred embodiment, the precursor compound has the formula 2CaO(Fe(2−x),Alx)O3+CaO.

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http://www.wvu.edu/˜agexten/landrec/chemtrt.htm#Costs%20of%20Treating%20AMD—Overview of Acid Mine Drainage Treatment with Chemicals, ( no date available).

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