Electrochemical re-alkalization of concrete

Details Electrochemical re-alkalization of concrete Electrochemical re-alkalization of concrete

C - Chemistry, Metallurgy

23

F

204/80

C23F 13/00 (2006.01) B28B 11/24 (2006.01) C04B 41/45 (2006.01) C04B 41/61 (2006.01) E04G 23/02 (2006.01)

Patent

CA 1337285

A process is disclosed for re-alkalizing carbonated reinforced concrete. An electric current is impressed between adjacent areas of concrete, one of which has become carbonated with consequent loss of pH, and the other of which is adequately alkaline in pH. The impressed voltage causes a migration of hydroxyl ions from the higher pH region to the lower pH region, to effect an increase in pH of the carbonated region to a satisfactory level. The region of high pH concrete may be either non-carbonated areas of the original concrete or a temporarily applied layer of an alkaline electrolyte.

590928

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