STP866: The Effect of Strain Rate on the Stress Corrosion Cracking of Steels for Prestressing Concrete

    Sánchez Gálvez, V
    Professors, E. T. S. Ingenieros de Caminos, Universidad Politecnica de Madrid, Madrid,

    Caballero, L
    Professors, E. T. S. Ingenieros de Caminos, Universidad Politecnica de Madrid, Madrid,

    Elices, M
    Professors, E. T. S. Ingenieros de Caminos, Universidad Politecnica de Madrid, Madrid,

    Pages: 9    Published: Jan 1985


    Abstract

    The aim of the paper is to investigate the stress corrosion cracking behavior of prestressing steels under general practical conditions. An aqueous solution of calcium hydroxide with small additions of sodium chloride has been used, the pH being 12.5 and the potential −0.6-V standard calomel electrode (SCE) as well as −1.2-V (SCE). Both tension tests at constant load and constant strain rate have been performed on specimens precracked by fatigue. The experimental results show that the constant load test, as proposed by the Prestressing International Federation (FIP), may be improved by the constant slow strain rate test in a realistic environment, needing a smaller number of tests and showing that in some cases fractures happen at stress intensity factor K1 values below the stress intensity threshold factor KISCC value as determined by a constant load test.

    Keywords:

    corrosion, prestressing steels, stress corrosion, slow strain rate tests, constant load tests, calcium hydroxide solution, fatigue precracked specimens


    Paper ID: STP33795S

    Committee/Subcommittee: G01.05

    DOI: 10.1520/STP33795S


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