ERRORS INTRODUCED BY THE GUARD RING DEVICE IN THE ON-SITE MEASUREMENT OF REBAR CORROSION RATES. CORROSION OF REINFORCEMENT IN CONCRETE. PAPERS PRESENTED AT THE THIRD INTERNATIONAL SYMPOSIUM ON "CORROSION OF REINFORCEMENT IN CONCRETE CONSTRUCTION", BELFRY HOTEL, WISHAW, WARWICKSHIRE, MAY 21-24, 1990

In 1987 the authors published their first paper on the possibilities of on-site measurement of rebar corrosion rate. In that paper the transmission line model was applied in order to calculate the critical length reached by an electrical signal along a rebar and therefore, the corrosion rate by unit of metal and concrete surface. Other papers have been recently published based in the same transmission line model. In the present paper the experimental errors which the guard ring induces, are commented upon. For this purpose beams and slabs were fabricated. The corrosion rate was measured by different methods. Apparent Polarization Resistance (Rp), Attenuation of Potential and with the Guard Ring. The results allow comparison of the reliability of the different methods of measuring the real Rp value and therefore, of the corrosion rates. Particularly, the Guard Ring cannot completely confine the electrical signal when the steel is passive and the confinement is only partial in the case of active corrosion, giving therefore higher corrosion intensity values than the real ones, especially in the case of the slabs (two dimensions).(A) For the covering abstract of the conference see IRRD 831449.

• Availability:
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• Corporate Authors:

  Elsevier Science Publishers

  Crown House, Linton Road
  Barking, Essex IG11 8JU,   England 
• Authors:
  • FELIU, S
  • Gonzalez, J A
  • Andrade, C
  • Rz-Maribona, I
• Publication Date: 1990

Language

• English

Media Info

• Pagination: p. 293-302
• Serial:
  • Publication of: CICC Publications
  • Publisher: CICC Publications

Subject/Index Terms

• TRT Terms: Beams; Conferences; Corrosion; Electric potential; Errors; Material reinforcement; Mathematical models; Measurement; Reinforced concrete; Reinforcing materials; Reliability (Statistics); Resistance (Electricity); Slabs; Steel
• Subject Areas: Data and Information Technology;

Filing Info

• Accession Number: 00606819
• Record Type: Publication
• Source Agency: Transport and Road Research Laboratory (TRRL)
• ISBN: 1-85166-487-4
• Files: ITRD, TRIS
• Created Date: Mar 31 1991 12:00AM