FACTORS OTHER THAN CHLORIDE LEVEL INFLUENCING CORROSION RATE OF REINFORCEMENT

To evaluate the degree of corrosion, reinforcements of a fourteen-year-old concrete member were completely bared. The 3-meter long beams were stored in 3-point flexion in an aggressive environment made by sequences of drying and wetting by a salt fog (35 g/l). The total chloride content was also measured at the level of all reinforcements. Because of the small concrete cover (10 mm for the stirrups and 16 mm for the longitudinal reinforcement), the chloride content appears to be significantly greater than the threshold usually used to evaluate the initiation of corrosion. Carbonation front was also measured and was only about 4 mm. Nevertheless, the degree of corrosion (mass loss calculation) shows no correlation with chloride content, as some large parts of reinforcement are not affected by corrosion. As a result, corrosion damage seems to be linked to a degradation of the steel-concrete interface. For tensile reinforcement, it corresponds to a mechanical degradation whereas for compression reinforcement it corresponds to the bleeding. This observation leads us to question ourselves about the relevance of a single value for the corrosion threshold. The nature of the interface between the steel and the concrete must be considered.

• Corporate Authors:

  American Concrete Institute (ACI)

  38800 Country Club Drive
  Farmington Hills, MI  United States  48331
• Authors:
  • Castel, A
  • Francois, R
  • Arliguie, G
• Conference:
  • Fifth CANMET/ACI International Conference on Durability of Concrete
  • Location: Barcelona, Spain
  • Date: 2000-6-4 to 2000-6-9
• Publication Date: 2000

Language

• English

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 629-644

Subject/Index Terms

• TRT Terms: Carbonation; Chlorides; Compressive strength; Corrosion; Interfaces; Reinforced concrete; Tensile strength
• Uncontrolled Terms: Steel concrete interface
• Subject Areas: Highways; Materials; I32: Concrete;

Filing Info

• Accession Number: 00795466
• Record Type: Publication
• Report/Paper Numbers: SP 192-38
• Files: TRIS
• Created Date: Jul 7 2000 12:00AM