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Evaluating prestressing strands and post-tensioning cables in concrete structures using nondestructive methods.
  • Published Date:
    2015-11-01
  • Language:
    English
Filetype[PDF-2.98 MB]


Details:
  • Publication/ Report Number:
    RC-1632
  • Resource Type:
  • Geographical Coverage:
  • Format:
  • Abstract:
    The objectives were to evaluate the ability of different NDE methods to detect and quantify

    defects associated with corrosion of steel reinforcement and grout defects in post-tensioning

    applications; and to evaluate the effectiveness of selected NDE methods to detect and quantify

    the deterioration. The study included side-by-side box beam bridges for evaluation of the

    condition of prestressing strands and web reinforcement. Decommissioned box beams were

    tested in the laboratory to relate the quantified deterioration to the measured residual flexural

    capacity. Also a segmental bridge was included for evaluation of the condition of the web

    reinforcement and post-tensioning ducts. Laboratory specimens simulated debonding and voids

    around steel reinforcement, loss of cross section area of steel reinforcement, and various

    grouting challenges. The NDE methods used were 1) ultrasonic testing for delamination/void

    detection; 2) electrochemical measurements for assessing the corrosive environment; and 3)

    magnetic flux leakage (MFL) to estimate loss of cross sectional area of embedded steel.

    Ultrasonic echo-pulse tomography was able to detect debonding of the steel reinforcement and

    to detect internal voids and delamination. The method was able to quantify the depth of the

    defect but not the defect length. Electrochemical testing isolated the areas with high chance of

    corrosion. The MFL pilot demonstration showed that MFL can detect changes in the area of the

    steel reinforcement in laboratory and field applications. Presently, the calibration overestimates

    the steel loss. There was good agreement between estimated beam flexural capacity based on

    NDE results and the measured capacity of full scale box beams.

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