Investigation of carbon fiber composite cables (CFCC) in prestressed concrete piles.
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Investigation of carbon fiber composite cables (CFCC) in prestressed concrete piles.

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  • Creators:
  • Corporate Creators:
    Florida Agricultural and Mechanical University. Dept. of Civil and Environmental Engineering
  • Subject/TRT Terms:
  • Publication/ Report Number:
  • Resource Type:
    Tech Report
  • Geographical Coverage:
    Florida
  • Corporate Publisher:
    Florida. Dept. of Transportation
  • Abstract:
    The Florida Department of Transportation (FDOT) commonly uses prestressed concrete piles in

    bridge foundations. These piles are prestressed with steel strands that, when installed in aggressive or

    marine environments, are subject to corrosion and therefore rapid degradation. Many solutions may

    address this issue, but they are not long-term. Hence, it would be desirable to use advanced materials

    that do not corrode. The goal of this research was to assess the suitability of using carbon fiber

    composite cables (CFCC), which do not corrode, in lieu of conventional steel prestressing strands.

    Five (5) 24-in. square prestressed concrete piles, three (3) 40-ft long and two (2) 100-ft long,

    were cast using 0.6-in. diameter CFCC strands produced by Tokyo Rope Manufacturing Company. A

    special anchoring system was used because CFCC strands cannot be conventionally gripped using

    wedges and a jack. The techniques employed to prestress these strands were documented, as well as the

    unique aspects involved in constructing and precasting CFCC-prestressed piles. During strand

    detensioning, stresses were monitored in the concrete at the piles' ends to determine the transfer length

    of CFCC strands, as a means of evaluating their bond characteristics.

    Development length tests and flexural tests were performed on two (2) of the 40-ft piles at the

    FDOT Marcus H. Ansley Structures Research Center to further assess the performance of the CFCC

    strands. Lastly, the two (2) 100-ft piles were driven at a bridge construction site, adjacent to standard

    steel-prestressed concrete piles. During driving operations, the behavior of the piles was monitored

    using embedded data collectors and a Pile Driving Analyzer®.

    The precasting efforts and test results show that the performance of piles prestressed with CFCC

    strands is comparable to those prestressed with steel. Using CFCC strands in prestressed concrete piles

    for bridge foundations, particularly in harsh environments, could potentially result in bridges that

    require less maintenance and have longer lifespans.

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