Durability performance of submerged concrete structures - phase 2.

Details

• Creators:
  Sagüés, Alberto A. ; Walsh, Michael T.
• Corporate Creators:
  University of South Florida. Dept. of Civil and Environmental Engineering
• Subject/TRT Terms:
  • Reinforced concrete
  • Corrosion
  • Steel
  • Durability
  • Bridge piers
  • Underwater structures
  • Field studies
• Publication/ Report Number:
  BDV25 977-12
• Resource Type:
  Tech Report
• Geographical Coverage:
  Florida
• Corporate Publisher:
  Florida. Dept. of Transportation
• Abstract:
  This project determined that severe corrosion of steel can occur in the submerged ; portions of reinforced concrete structures in marine environments. Field studies of decommissioned ; pilings from Florida bridges revealed multiple instances of strong corrosion localization, showing ; appreciable local loss of steel cross-section. Quantitative understanding of the phenomenon and its ; causes has been developed, and a predictive model was created based on that understanding. ; Corrosion rate estimates and the extent of corrosion localization from the field observations were ; consistent with the results of the predictive model. The most likely explanation for the phenomenon is ; that cathodic reaction rates under oxygen diffusional limitation that are negligible in cases of uniform ; corrosion can support substantial corrosion rates in cases of localized corrosion. Modeling projected ; that, with use of sacrificial anode cathodic protection, corrosion in the submerged zone could be ; virtually eliminated, together with significant reduction of the rate of corrosion damage progression in ; the low elevation zone above water. Continuation work should be conducted to define an alternative ; limit state other than visible external cracks and spalls for submerged reinforced concrete, and for ; determination of the possible structural consequences of this form of corrosion, as well as to assess ; the technical feasibility and cost/benefit aspects of incorporating protective anodes in new pilings.
  More +
• Format:
  PDF
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/29209/dot_29209_DS1.pdf
• File Type:
  [PDF - 3.12 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:c5b26d7b4e435ef8fe4657f95017376e0351b85dba26e92a352dd0ee12bb921e