US 7,101,429 B2 · Method of resisting corrosion in metal reinforcing elements contained in concrete and related compounds and structures

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(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.

Claims8

Dependent claims

A method of resisting corrosion of metals in concrete comprising:

introducing into concrete having metal elements at least one compound capable of sequestering chloride ions, the compound having the formula
3Me(II)O·(R, R′)2O3·Me(II)(anion)2·nH2O,
where at least one of R and R′ is present;
R and R′ are different and are independently selected from the group consisting of Al, Fe Cr, and not present;
anion is selected from the group consisting of NO2, NO3 and OH;
n is 0 to 24;
and Me(II) is a cation and is selected from the group consisting of Ca, Ba, Sr, Mn, and Zn;
and combinations thereof;
and
wherein at least one precursor to the compound is provided from acid mine drainage sludge.

7 more elements

Dependencies are inferred from the claim text.

Facts

Application

11/039,101Filed 20 Jan 2005 · continuation in part

Priority

13 Nov 2001

Published

US 2005/0121651 A19 Jun 2005

Granted

5 Sep 2006

Term ends

Not estimatedThe source records don’t support an estimate.

Classification22 codes

C04B 22/0093
Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators or shrinkage compensating agents:…
C04B 22/06
Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators or shrinkage compensating agents:…
C04B 22/085
Acids or salts thereof: containing nitrogen in the anion, e.g. nitrites
C04B 28/02
Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic…

Family

Application10/010,581Parent of this continuation-in-part · filed 13 Nov 2001

Application10/044,660Parent of this continuation-in-part · filed 9 Jan 2002

Application10/047,226Parent of this continuation-in-part · filed 14 Jan 2002

US 6,610,138 B1Parent of this continuation-in-part · filed 26 Aug 2003

Application10/817,605Parent of this continuation-in-part · filed 2 Apr 2004

US 2005/0121651 A1Pre-grant publication · published 9 Jun 2005

US 6,755,925 B1Parent of this continuation-in-part

US 6,810,634 B1Parent of this continuation-in-part

US 2004/0261341 A1Published application

US 7,081,156 B2Related patent

US 7,101,429 B2This patent

From the US filing history. Foreign family members aren’t listed.

Method of resisting corrosion in metal reinforcing elements contained in concrete and related compounds and structures

Life of this patent

Method of resisting corrosion in metal reinforcing elements contained in concrete and related compounds and structures

Life of this patent

Abstract

Claims8