Direct sequestration of chloride ions

Details Direct sequestration of chloride ions Direct sequestration of chloride ions

2006-07-11

2006-07-11

Marcantoni, Paul (Department: 1755)

Compositions: coating or plastic

Coating or plastic compositions

Corrosion inhibiting coating composition

C106S813000, C106S819000, C106S014210

Reexamination Certificate

active

07074263

ABSTRACT:
The present invention provides methods and compounds for the direct sequestration of chloride ions without requiring the addition of a source of anion such as nitrite or nitrate. A direct sequestration additive is introduced to fresh concrete or hardened concrete where the additive reacts with incoming chloride ions to form a low solubility, chloride-containing compound which captures or sequesters chloride ions. In a preferred embodiment, the chloride-containing compound comprises 3CaO.Fe(2-x)AlxO3.CaCl2.nH2O, where x ranges from about 0 to 1.4, and n ranges from about 8 to 24. The chloride ions may be provided in the form of deicing salt or sea water. Because chloride-containing compounds such as 3CaO.Fe(2-x)AlxO3.CaCl2.nH2O are formed directly without requiring the addition of a source of anion (e.g. nitrite or nitrate), the process is referred to as “direct sequestration.”

REFERENCES:
patent: 4092109 (1978-05-01), Rosenberg et al.
patent: 4285733 (1981-08-01), Rosenberg et al.
patent: 5049412 (1991-09-01), Miller
patent: 5198082 (1993-03-01), Vennesland et al.
patent: 5356472 (1994-10-01), Odler
patent: 5435846 (1995-07-01), Tatematsu et al.
patent: 6610138 (2003-08-01), Brown
patent: 6755925 (2004-06-01), Brown
patent: 6810634 (2004-11-01), Brown
patent: 2004/0261341 (2004-12-01), Brown
“Inhibitors of corrosion of the reinforcement steel in concrete with addition of calcium chloride” Ratinov et al. Tr. Nauchn-lssled Inst Betona i Zhelezobetona (1961), No. 22, p. 40-53.
Taylor, Cement Chemistry, 1997, pp. 173-176.
American Concrete Institute, Committee 201 report: Guide to Durable Concrete, (no date available).
Taylor, Cement Chemistry, 1990, p. 28.

Affiliated with

Also associated with

Rating

Direct sequestration of chloride ions does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Direct sequestration of chloride ions, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Direct sequestration of chloride ions will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3579442