A method of resisting corrosion in metal reinforcing...

C - Chemistry – Metallurgy – 23 – F

Patent

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Details

C23F 11/18 (2006.01) C04B 22/00 (2006.01) C04B 22/06 (2006.01) C04B 22/08 (2006.01) C04B 28/02 (2006.01) C04B 41/50 (2006.01) C04B 41/65 (2006.01) E04B 1/00 (2006.01) E04B 1/04 (2006.01) E04B 1/06 (2006.01) E04C 5/01 (2006.01)

Patent

CA 2467342

In some embodiments, alternate sources of aluminum or calcium are provided in various ways including the desired compounds. The further object of the present invention contemplate in situ creation of the compound in interest in fresh concrete and as a slurry which can be employed in remediation of existing concrete structures. A method of resisting corrosion in concrete containing metal elements is provided. It includes introducing into fresh concrete, containing metal elements, at least one compound capable of sequestering chloride ions. The method may also involve employing a compound which is capable of establishing a corrosion resistant oxide layer on the metal reinforcing elements. The invention also includes certain compounds which may be employed in the method as well as concrete structures containing the compounds. In another embodiment of the invention, concrete structures may be rehabilitated by providing an overlay containing a compound of the type which will contribute to corrosion resistance either through chloride ion sequestering or creating barriers around metal structural elements with the overlay being provided in situ or as a preformed member and with possible use of a slurry in combination with an overlay segment. In another embodiment, a source of alumina is combined in solution with Ca(NO2)2 and/or NaNO2 with the resultant solution being introduced into the pores of a concrete structure, preferably under pressure to cause them to react with each other and with Ca(OH)2 contained within the concrete to produce the desired corrosion inhibiting compound.

Selon certaines variantes, l'invention concerne différentes manières de fournir des sources d'aluminium ou de calcium, y compris les composés recherchés. L'invention concerne en outre l'élaboration in situ du composé recherché, dans du béton frais et sous forme de suspension épaisse, pour la réhabilitation de structures de béton existantes. L'invention concerne aussi un procédé assurant une résistance à la corrosion dans du béton qui contient des éléments métalliques. Ce procédé consiste à introduire dans le béton considéré au moins un composé capable de séquestrer les ions chlorure, et éventuellement à utiliser un composé capable d'établir une couche d'oxyde anticorrosion sur les éléments de renforcement métalliques. L'invention concerne également certains composés susceptibles d'être utilisés dans la mise en oeuvre du procédé, et des structures de béton contenant lesdits composés. Selon une autre variante, on décrit la réhabilitation de structures de béton reposant sur un recouvrement à base de composé contribuant à l'effet anticorrosion, par séquestration d'ions chlorure ou par l'établissement de barrières autour des éléments structurels métalliques. En l'occurrence, l'habillage est constitué in situ ou établi par élément préformé, éventuellement au moyen d'une suspension épaisse utilisée en combinaison avec un segment de recouvrement. Selon une autre variante, on combine une source d'alumine en solution avec du Ca(NO¿2?)¿2? et/ou du NaNO¿2?, puis on introduit la solution résultante dans les pores d'une structure de béton, de préférence sous pression afin d'induire une réaction mutuelle et une réaction avec le Ca(OH)¿2? contenu dans le béton, donnant le composé anticorrosion recherché.

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