A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Long-term protection of reinforced concrete by galvanic cathodic protection - test results
Galvanic cathodic protection (GCP) of reinforced concrete offers important advantages of simplicity, lower cost, and lack of cumbersome monitoring and maintenance procedures. But since GCP of reinforced concrete structures is relatively new, there is a general lack of long-term test results. This paper presents test data for the application of zinc anodes activated by a combination of lithium nitrate and lithium bromide in indoor test blocks, large outdoor test slabs, and field trials, all operational from 5 to nearly 8 years. Protective current delivered by GCP in indoor test blocks declined from about one mA to about 0.04 mA after 8 years on-line, but cathodic polarization of steel remained high throughout the period. Polarization of steel bars in outdoor test slabs were >100 mV at most test points after VA years, and at 50% of test points after 5 years on-line. Polarization was more difficult to achieve after 5 years on-line in a field trial where chloride contamination and corrosion rates of steel were much higher, but even then, little increase in concrete delamination was noted over the test period.
Long-term protection of reinforced concrete by galvanic cathodic protection - test results
Galvanic cathodic protection (GCP) of reinforced concrete offers important advantages of simplicity, lower cost, and lack of cumbersome monitoring and maintenance procedures. But since GCP of reinforced concrete structures is relatively new, there is a general lack of long-term test results. This paper presents test data for the application of zinc anodes activated by a combination of lithium nitrate and lithium bromide in indoor test blocks, large outdoor test slabs, and field trials, all operational from 5 to nearly 8 years. Protective current delivered by GCP in indoor test blocks declined from about one mA to about 0.04 mA after 8 years on-line, but cathodic polarization of steel remained high throughout the period. Polarization of steel bars in outdoor test slabs were >100 mV at most test points after VA years, and at 50% of test points after 5 years on-line. Polarization was more difficult to achieve after 5 years on-line in a field trial where chloride contamination and corrosion rates of steel were much higher, but even then, little increase in concrete delamination was noted over the test period.
Long-term protection of reinforced concrete by galvanic cathodic protection - test results
Langzeitschutz von Stahlbewehrungen durch galvanischen kathodischen Schutz - Versuchsergebnisse
Bennett, Jack (author) / McCord, William T. (author)
2008
13 Seiten, 14 Bilder, 8 Quellen
Conference paper
English
Galvanic cathodic protection for reinforced concrete bridge decks : field evaluation
| UB Braunschweig | 1981