A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Thermal-sprayed zinc anodes for cathodic protection of reinforced concrete structures
Thermal-sprayed zinc anodes are used to cathodically protect rebar from corrosion in reinforced concrete structures. Research was conducted to determine the useful lifetime of these anodes and the need for special surface treatments prior to spraying. Half of the samples were heated prior to being thermally sprayed with zinc; the other half remained unheated. The preheated samples had initial zinc-concrete adhesion strengths that were 80 % higher than the unheated samples, but this difference became insignificant after the passage of approximately 200 kC/m2 (5.2 A-h/ft2) of charge. Adhesion strengths for all samples decreased after approximately 400 kC/m2 (10.4 A-h/ft2) and the zinc had largely disbonded after an equivalent exposure period of approximately 27 years. These changes in adhesion strength were correlated with observed changes in the permeability of the zinc coating to water, the electrical behaviour of the zinc-concrete interface, and the chemical composition and mineral structure of this interface.
Thermal-sprayed zinc anodes for cathodic protection of reinforced concrete structures
Thermal-sprayed zinc anodes are used to cathodically protect rebar from corrosion in reinforced concrete structures. Research was conducted to determine the useful lifetime of these anodes and the need for special surface treatments prior to spraying. Half of the samples were heated prior to being thermally sprayed with zinc; the other half remained unheated. The preheated samples had initial zinc-concrete adhesion strengths that were 80 % higher than the unheated samples, but this difference became insignificant after the passage of approximately 200 kC/m2 (5.2 A-h/ft2) of charge. Adhesion strengths for all samples decreased after approximately 400 kC/m2 (10.4 A-h/ft2) and the zinc had largely disbonded after an equivalent exposure period of approximately 27 years. These changes in adhesion strength were correlated with observed changes in the permeability of the zinc coating to water, the electrical behaviour of the zinc-concrete interface, and the chemical composition and mineral structure of this interface.
Thermal-sprayed zinc anodes for cathodic protection of reinforced concrete structures
Covino, B.S. jun. (author) / Cramer, S.D. (author) / Holcomb, G.R. (author) / Bullard, S.J. (author) / McGill, G.E. (author) / Cryer, C.B. (author)
Materials for the New Millennium, Materials Engineering Conf, 4 ; 2 ; 1512-1521
1996
10 Seiten, 6 Bilder, 11 Quellen
Conference paper
English
Thermal-Sprayed Zinc Anodes for Cathodic Protection of Reinforced Concrete Structures
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