STRESS CORROSION IN PRESTRESSING STEEL

A literature survey revealed that there were three main causes of failure: hydrogen embrittlement, delayed fracture, and stress or active path corrosion. Most metals fail by stress corrosion only in certain chemical environments, although high tensile steels fracture in many corrosive media. Factors causing hydrogen embrittlement include the presence of other alloying elements in the steel, heat treatment and metallographic structure. Active path corrosion is an anodic process usually believed to occur in hot nitrate solutions. Experimental work was then carried out to substantiate the literature survey. First, tests were carried out on wire samples stressed by coiling around a former, immersing them in corrosive solutions and examining for cracks. Second, straight specimens were strained at a constant stress level, immersed in solutions and maintained at constant potential with respect to the solution. Third, potential measurements were made on steel electrodes in various solutions and cement mixes to deduce the probable level of self polarisation occuring during in-service corrosion. (A) /TRRL/

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  • Corporate Authors:

    Construction Industry Research & Information Assoc

    6 Storey's Gate
    London SW1P 3AU,   England 
  • Authors:
    • Gilchrist, J D
  • Publication Date: 1975-5

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Filing Info

  • Accession Number: 00137672
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Report/Paper Numbers: Technical Note 64 Monograph
  • Files: ITRD, TRIS
  • Created Date: Nov 9 1977 12:00AM