Direct sequestration of chloride ions

C - Chemistry – Metallurgy – 04 – B

Patent

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C04B 14/48 (2006.01) C04B 7/36 (2006.01) C04B 24/00 (2006.01)

Patent

CA 2600728

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".

La présente invention a trait à des procédés et des composés pour la séquestration directe d'ions de chlorure sans nécessiter l'addition d'une source d'anion telle que du nitrite ou du nitrate. Un additif de séquestration directe est introduit dans du béton frais ou du béton endurci dans lequel les additifs réagissent avec des ions de chlorure entrants pour former un composé contenant du chlorure à faible solubilité qui capture ou séquestre des ions de chlorure. Dans un mode de réalisation préféré, le composé contenant du chlorure comprend: 3CaO.F(2-x) AlxO3.CaCl2.nH2O, où x est compris entre environ 0 et 1,4, et n est compris entre environ 8 et 24. Les ions de chlorure peuvent être fournis sous la forme d'un sel de dégivrage ou de l'eau de mer. Etant donné que des composés contenant du chlorure tels que 3CaO.F(2-x) AlxO3.CaCl2.nH2O sont formés directement sans nécessiter d'addition d'une source d'anion (par exemple, du nitrite ou du nitrate), le procédé est désigné "séquestration directe".

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