Performance of black, galvanized, and epoxy-coated reinforcing steels in chloride-contaminated concrete
- Univ. of New South Wales, Campbell (Australia). Dept. of Civil and Maritime Engineering
The corrosion performance of black steel, galvanized steel, and epoxy-coated steel in concrete was investigated. Samples were exposed to cyclic salt water wetting and drying or to a continuous salt fog. Corrosion assessments included half-cell potential monitoring, chloride (Cl[sup [minus]]) analysis, and metal loss determinations. Galvanized steel resisted Cl[sup [minus]] levels in concrete [approximately]2.5 times that which caused corrosion of black steel. Zinc (Zn) provided sacrificial protection for a period [approximately] 4 to 5 times that for the initiation of corrosion of black steel in equivalent conditions. At the cut ends of galvanized bars, the Zn locally protected the exposed steel to a distance of [approximately]8 mm. Epoxy coating imparted excellent overall corrosion protection. However, at points of damage to the coating and at the unrepaired cut ends of bars, localized corrosion on the exposed steel occurred over the same interval and to a similar extent as for uncoated steel. In many instances, corrosion proceeded along the bar under the epoxy coating with subsequent detachment of the coating. Repairs to cut ends of epoxy-coated bars did not delay corrosion of the steel substrate substantially.
- OSTI ID:
- 5437900
- Journal Information:
- Corrosion (Houston); (United States), Journal Name: Corrosion (Houston); (United States) Vol. 50:1; ISSN 0010-9312; ISSN CORRAK
- Country of Publication:
- United States
- Language:
- English
Similar Records
Corrosion of the zinc alloy coating in galvanized reinforced concrete
Time-to-corrosion of reinforcing steel in concrete slabs. Volume 5. Calcium nitrite admixture or epoxy-coated reinforcing bars as corrosion protection systems. Report for July 1980-December 1982
Related Subjects
360105 -- Metals & Alloys-- Corrosion & Erosion
360604* -- Materials-- Corrosion
Erosion
& Degradation
ALLOYS
BUILDING MATERIALS
CHEMICAL REACTIONS
COATINGS
COMPARATIVE EVALUATIONS
COMPOSITE MATERIALS
CONCRETES
CORROSION
CORROSIVE EFFECTS
EPOXIDES
EVALUATION
HYDROGEN COMPOUNDS
IRON ALLOYS
IRON BASE ALLOYS
MATERIALS
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
OXYGEN COMPOUNDS
PERFORMANCE TESTING
PROTECTIVE COATINGS
REINFORCED CONCRETE
REINFORCED MATERIALS
SEAWATER
STEELS
TESTING
WATER
ZINC ALLOYS