C - Chemistry – Metallurgy – 04 – B
Patent
C - Chemistry, Metallurgy
04
B
204/119, 6/89, 2
C04B 41/72 (2006.01) C04B 41/53 (2006.01) C04B 41/65 (2006.01) C23F 13/02 (2006.01)
Patent
CA 2280976
An electrochemical process for the removal of chloride ions from reinforced concrete which comprises: passing a direct current between (i) an anode in electrical contact with an adherent coating containing a water retaining adhesive material and an aqueous electrolyte applied to an external surface of the concrete and (ii) a cathode which is located internally in the concrete, which processes causes chloride ions to migrate to the anode and wherein to reduce the production of chlorine gas, the coating contains, as a chlorine scavenger, solid calcium hydroxide or barium hydroxide or mixtures thereof the chlorine scavenger being present in an amount of at least 8 %, preferably 20 to 50 %, by weight based on the dry weight of the water retaining material.
L'invention concerne un procédé électrochimique permettant de retirer des ions chlorure du béton armé, qui consiste à faire passer un courant continu entre (i) une anode en contact électrique avec un enduit adhésif renfermant une matière adhésive retenant l'eau et un électrolyte aqueux appliqué à une surface extérieure du béton et (ii) une cathode placée à l'intérieur du béton. Ce procédé fait migrer les ions chlorure vers l'anode et permet de réduire la production de chlore gazeux. L'enduit contient, en tant qu'adsorbant de chlorure, de l'hydroxyde de calcium ou de l'hydroxyde de baryum, solides, ou leurs mélanges, la part d'adsorbant de chlorure étant d'au moins 8 %, de préférence de 20 à 50 %, en poids du poids anhydre de la matière retenant l'eau.
Fosroc International Limited
Gowling Lafleur Henderson Llp
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