ON-SITE CORROSION MEASUREMENTS IN CONCRETE STRUCTURES

This paper describes a device for measuring the corrosion rates of reinforcing bars in concrete, that was developed during the European Eureka project EU 401. This instrument applies the polarisation resistance technique to real-size concrete structures, and uses a controlled guard ring, and sensors for: (1) corrosion rate and half cell potential measurements; and (2) concrete resistivity, ambient temperature, and relative humidity measurements. It is portable, fully computerised, guides its operator automatically through its set-up procedure, and makes automatic readings. Each of its measurements takes 2-5min, and it can store up to 100 readings, then download them to a computer. The device allows measurement of corrosion rate, corrosion potential, and concrete resistivity. Its performance is discussed, and some results are summarised, which have been obtained from concrete structures in Spain affected by carbonation of chlorides. Case studies are outlined for: (1) retaining walls in a new building; (2) a factory for sylvinite production; and (3) a deteriorated bridge. Corrosion rate values, complemented by concrete resistivity rates, enabled the study of the rate of deteriorating of reinforcing bars. No correlation was found between corrosion rate and corrosion potential in concrete structures.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/09670726
• Corporate Authors:

  PALLADIAN PUBLICATIONS LTD

  THE OLD FORGE
  ELSTEAD, SURREY  United Kingdom  GU8 6DD
• Authors:
  • Rodriguez, J
  • ORTEGA, M
  • GARCIA, A M
  • JOHANSSON, L
  • Petterson, K
• Publication Date: 1995

Language

• English

Media Info

• Features: References;
• Pagination: p. 27-30
• Serial:
  • CONSTRUCTION REPAIR
  • Volume: 9
  • Issue Number: 6
  • Publisher: PALLADIAN PUBLICATIONS LTD
  • ISSN: 0967-0726

Subject/Index Terms

• TRT Terms: Automatic control; Automation; Bridges; Carbonates; Corrosion; Digital computers; Halides; Measurement; Moisture content; Polarization; Reinforced concrete; Reinforcement (Engineering); Reinforcing materials; Resistance (Electricity); Sensors; Steel; Temperature; Walls
• ITRD Terms: 3882: Automatic; 3455: Bridge; 7312: Carbonate; 5252: Corrosion; 8673: Digital computer; 7314: Halide; 6136: Measurement; 5920: Moisture content; 6796: Polarization; 4794: Reinforced concrete; 3471: Reinforcement (in mater); 6916: Resistance (electr); 6120: Sensor; 4542: Steel; 6722: Temperature; 3368: Wall
• Subject Areas: Bridges and other structures;

Filing Info

• Accession Number: 00723190
• Record Type: Publication
• Source Agency: Transport Research Laboratory
• Files: ITRD
• Created Date: Jul 26 1996 12:00AM