A CRITICAL EVALUATION OF CATHODIC PROTECTION FOR PRESTRESSING STEEL IN CONCRETE. 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

Cathodic protection (cp) is the only recognized technique for arresting ongoing corrosion of reinforcing steel in concrete; however, concern has been raised regarding applicability of this technology to prestressing steel because of hydrogen embrittlement. The present paper reviews the influence of potential, chlorides, electrolyte pH and precharging time upon prestressing steel embrittlement and concludes that -0.90v., SCE, is an appropriate lower limit potential for protection. From this, two critical questions regarding cp applicability are raised. The first pertains to the effect of cp upon tendon-concrete bond strength and the second to determination of corrosion state of the tendon, as is a necessary precursor to establishing appropriateness of cp. A new technology termed electrochemical proof testing (ECPT) for determination of the latter (corrosion state) is introduced, and application of this to qualifying prestressing steel for cathodic protection is discussed.(A) For the covering abstract of the conference see IRRD 831449.

  • Availability:
  • Corporate Authors:

    Elsevier Science Publishers

    Crown House, Linton Road
    Barking, Essex IG11 8JU,   England 
  • Authors:
    • Hartt, W H
  • Publication Date: 1990

Language

  • English

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Filing Info

  • Accession Number: 00606837
  • 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