A RECORD CP SYSTEM

This article describes the installation of what is probably the world's largest remotely monitored cathodic protection system, on the reinforced concrete deck of the Clyde Tunnel under the River Clyde in Glasgow. This twin bore tunnel is 750m long and has 9m diameter. The road deck became corroded by chloride contamination due to the ingress of de-icing salts. There had been two previous repair contracts within the tunnel structure. Experience from them indicated that it would be prohibitively costly to remove and replace all the contaminated concrete, using conventional methods. Corrosion had occurred in the top-level reinforcing steel as well as the more visible soffit-level corrosion. The electro-chemical repair techniques of desalination and cathodic protection (CP) were considered, to minimise the extent of concrete removal. A trial contract for CP was chosen, to establish the effectiveness of CP systems using different types of anode system, and assess how well they could protect the upper reinforcing steel. The resulting outline CP specification stated requirements for a design-and-construct CP system with a 25-year operating life. The design, anode zone, construction, and installation of this system are described. The works have been completed in the West Tunnel and begun in the East Tunnel.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/14605856
• Corporate Authors:

  Palladian Publications Limited

  15 South Street
  Farnham Surrey GU97QU,   United Kingdom 
• Authors:
  • NOYCE, P
  • Couper, A
• Publication Date: 1998

Language

• English

Media Info

• Pagination: p. 49-52,54-6
• Serial:
  • CONCRETE ENGINEERING INTERNATIONAL
  • Volume: 2
  • Issue Number: 5
  • Publisher: THE CONCRETE SOCIETY
  • ISSN: 1460-5856

Subject/Index Terms

• TRT Terms: Construction; Corrosion; Deicing chemicals; Design; Electrodes; Halides; Installation; Prevention; Reinforced concrete; Repairing; Rigid pavements; Tunnels; Urban areas
• Geographic Terms: United Kingdom
• ITRD Terms: 3655: Construction; 5252: Corrosion; 2598: Deicing; 9011: Design (overall design); 6951: Electrode; 7314: Halide; 3840: Installation; 9149: Prevention; 4794: Reinforced concrete; 3635: Repair; 2964: Rigid pavement; 3374: Tunnel; 8119: United Kingdom; 313: Urban area
• Subject Areas: Bridges and other structures; Construction; Design; Highways; Maintenance and Preservation; Security and Emergencies;

Filing Info

• Accession Number: 00757364
• Record Type: Publication
• Source Agency: Transport Research Laboratory
• Files: ITRD
• Created Date: Dec 17 1998 12:00AM