Effectiveness of cathodic protection : final report, June 30, 2009.

Details

• Creators:
  Bullard, Sophie J. ; Cramer, Stephen ; Covino, Bernard
• Corporate Creators:
  National Energy Technology Laboratory (U.S.)
• Corporate Contributors:
  Oregon. Dept. of Transportation. Research Unit
• Subject/TRT Terms:
  • Concrete bridges
  • Prestressed concrete bridges
  • Cathodic protection
  • Foundations
  • Piers (Supports)
  • Concrete bridges--Foundations and piers--Cathodic protection--Oregon
  • Concrete bridges--Floors--Cathodic protection--Oregon
  • Reinforced concrete--Cathodic protection--Oregon
• Publication/ Report Number:
  FHWA-OR-RD-09-18
• Resource Type:
  Tech Report
• Geographical Coverage:
  Oregon
• Edition:
  Final report.
• Corporate Publisher:
  National Energy Technology Laboratory
• Abstract:
  The report provides a summary of Oregon’s experience with cathodic protection of coastal reinforced concrete bridges. ; Thermal-sprayed anodes, foil anodes with a conductive adhesive, and carbon painted anodes are effective in distributing ; current to the steel reinforcement in concrete bridges. A resistive layer develops at the anode-concrete interface with ; increasing electrochemical age, thereby increasing anode polarization. In impressed current cathodic protection (ICCP) ; systems this is reflected in a higher circuit resistance. In sacrificial anode cathodic protection (SACP) systems it results in ; lower current output. Periodic wetting of the anode by rain, fog, and dew is an important factor in reducing anode ; polarization. ; Catalyzed thermal-sprayed titanium anodes under ICCP service develop no significant anode polarization with ; electrochemical age. They perform well in both low and high humidity environments, and exhibit stable long-term ; performance. ; Humectants based on LiNO3 and LiBr promote more effective performance of new and aged anodes in CP systems than ; untreated anodes. In SACP tests, LiBr was more effective ; than LiNO3. In accelerated ICCP, LiNO3 was more effective than LiBr. ; In SACP service, zinc hydrogel anodes produce a stable protection current sufficient to protect reinforcing bar from ; corrosion. There was practically no effect of changing moisture conditions on current production and no evidence of aging ; effects in an Oregon DOT field trial.
  More +
• Format:
  PDF
• Funding:
  SPR 345
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/17202/dot_17202_DS1.pdf
• File Type:
  [PDF - 260.88 KB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:2f493643d39b4276bb3ef421f316a17baac8c09e87bcf198d60fede858591ae3