DIRECT SEQUESTRATION OF CHLORIDE IONS

Title:

DIRECT SEQUESTRATION OF CHLORIDE IONS

Document Type and Number:

WIPO Patent Application WO2006098805

Kind Code:

A3

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)Al_xO₃ 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".

Inventors:

BROWN PAUL W (US)

Application Number:

PCT/US2006/001479

Publication Date:

November 23, 2006

Filing Date:

January 18, 2006

Export Citation:

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Assignee:

BROWN PAUL W (US)

International Classes:

C04B14/48; C04B7/36; C04B22/00; C04B22/08; C04B24/00; C04B28/02; C04B41/50; C04B41/65; E04C5/01

Foreign References:

US5435846A	1995-07-25
US5356472A	1994-10-18
US4092109A	1978-05-30
US4285733A	1981-08-25

Other References:

"RATINOV et al (abstract)"
See also references of EP 1861340A4

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