Method of resisting corrosion in metal reinforcing elements contained in concrete and related compounds and structures
US7101429B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jan 20, 2005 |
| Grant date | Sep 5, 2006 |
| Priority date | — |
| Expiry date | Jan 20, 2025 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02W30/91
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
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 formula2Me′(II)O·(Y(2−x),Y′x)O3+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(2−x),Alx)O3+CaO.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.