Effectiveness of sacrificial anodes in high-resistivity shotcrete repairs.

Details

• Creators:
  Brown, Michael Carey ; Sharp, Stephen R
• Corporate Creators:
  Virginia Transportation Research Council (VTRC) ; Virginia. Dept. of Transportation
• Subject/TRT Terms:
  • Sacrificial anodes
  • Shotcrete
  • Concrete bridges--Corrosion--Virginia
  • Reinforced concrete--Cathodic protection
• Publication/ Report Number:
  VTRC 05-R25
• Resource Type:
  Tech Report
• Geographical Coverage:
  Virginia
• Edition:
  Final report;05/01/0402/28/05.
• Corporate Publisher:
  Virginia Transportation Research Council (VTRC)
• Abstract:
  This study investigated the use of discrete sacrificial anodes to improve the durability and extend the life of a shotcrete patch repair in a column. Three columns were used in the investigation. In two columns, anodes were placed around the perimeter of the repair area. In a third column, used as a control, anodes were not placed inside the repair area. Shotcrete was then placed in the repair areas of all three columns. The study found that the current density level needed to improve the resistance of the steel to chloride-induced corrosion is being met. In addition, the anode current is able to reach a distance of 16 cm from the anode center, meeting the requirements for cathodic prevention within this region. A cost analysis, using the capital recovery method, indicated that repairs using shotcrete plus cathodic protection will cost less than repairs using shotcrete alone.
• Format:
  PDF
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/19677/dot_19677_DS1.pdf
• File Type:
  [PDF - 1.08 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:8391067e9035c471bdde22431fa2cbba0833fec0696532dffa28ffe781911fa40dfb6230fd8f1bb6d9e10969cc47c6a794781eed661f50888792440956cd034e