CORROSION IN PARKING STRUCTURES

Parking structures are especially liable to concrete deterioration, due to the combined effects of temperature variations, rain, snow, and intrusion of de-icing salts. This article discusses the implications of chloride ion penetration into multi-storey parking structures, and effective methods of survey and diagnosis. The most serious threat to the structures' durability is corrosion of steel reinforcement due to salt intrusion. Such corrosion leads to spalling, forming dangerous potholes. Corrosion occurs when the normal passive layer, protecting the steel, is affected by depassivation, most often caused by chloride ions and carbonation. The most effective techniques for identifying the risks have been found to be: (1) visual and delamination surveys; (2) depth of carbonation and cover surveys; (3) half-cell potential and chloride contamination surveys; and (4) linear polarisation and resistivity measurements to estimate likely future corrosion rates. A qualitative risk assessment compares the hazards and risks identified for different structural elements and components. A quantitative assessment estimates the strength of a structural element and predicts when it will no longer be safe and need repair or strengthening. The article lists the principal repair options, and outlines a rational maintenance strategy.

• 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:
  • BEAMISH, S
  • Roberts, M
• Publication Date: 1998

Language

• English

Media Info

• Features: References;
• Pagination: p. 34-7
• Serial:
  • CONCRETE ENGINEERING INTERNATIONAL
  • Volume: 2
  • Issue Number: 8
  • Publisher: THE CONCRETE SOCIETY
  • ISSN: 1460-5856

Subject/Index Terms

• TRT Terms: Concrete; Corrosion; Deicing chemicals; Evaluation and assessment; Halides; Hazards; Maintenance; Material reinforcement; Methodology; Multistory structures; Parking garages; Rain; Reinforced concrete; Reinforcing materials; Repairing; Snow; Steel; Temperature
• ITRD Terms: 4755: Concrete; 5252: Corrosion; 2598: Deicing; 9020: Evaluation (assessment); 7314: Halide; 3847: Maintenance; 9102: Method; 924: Multi storey parking garage; 2507: Rain; 4794: Reinforced concrete; 3471: Reinforcement (in mater); 3635: Repair; 9150: Risk; 2552: Snow; 4542: Steel; 6722: Temperature
• Subject Areas: Highways; Maintenance and Preservation; Terminals and Facilities;

Filing Info

• Accession Number: 00767081
• Record Type: Publication
• Source Agency: Transport Research Laboratory
• Files: ITRD
• Created Date: Aug 6 1999 12:00AM