STP713: Corrosion of Steel Tendons Used in Prestressed Concrete Pressure Vessels

    Griess, JC
    Engineer, Metals and Ceramics Division and engineer, Engineering Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tenn.

    Naus, DJ
    Engineer, Metals and Ceramics Division and engineer, Engineering Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tenn.

    Pages: 19    Published: Jan 1980


    Abstract

    The purpose of this investigation was to determine the corrosion behavior of a high-strength steel [Specifications for Uncoated Seven-Wire-Stress-Relieved Strand for Prestressed Concrete (ASTM A 416-74, Grade 270)], typical of those used as tensioning tendons in prestressed concrete pressure vessels, in several corrosive environments, and to determine the protection obtained by coating the steel with two commercial petroleumbase greases or with portland cement grout. In addition, the few reported incidents of prestressing steel failures in concrete pressure vessels used for containment of nuclear reactors were reviewed. The susceptibility of the steel to stress corroslon cracking and hydrogen embrittlement and its general corrosion rate were determined in several salt solutions. Wires coated with the greases and grout were soaked for long periods in the same solutions and changes in their mechanical properties were subsequently determined. All three coatings appeared to give essentially complete protection; however, flaws in the grease coatings could be detrimental, and flaws or cracks less than 1-mm-wide (0.04 in.) in the grout were without effect.

    Keywords:

    prestressing steel, high-strength steel, grout, petroleum-base greases, stress-corrosion cracking, hydrogen embrittlement, corrosion, protective coatings


    Paper ID: STP27467S

    Committee/Subcommittee: G01.14

    DOI: 10.1520/STP27467S


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