Method of resisting corrosion in metal reinforcing elements contained in concrete and related compounds and structures
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United States of America Patent
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Sep 5, 2006
Grant Date -
Jun 9, 2005
app pub date -
Jan 20, 2005
filing date -
Nov 13, 2001
priority date (Note) -
Expired
status (Latency Note)
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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 formula 2Me'(II)O(Y.sub.(2-x),Y'.sub.x)O.sub.3+qMe'(II)O,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.sub.(2-x),Al.sub.x)O.sub.3+CaO.
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