Feasibility of Using Shape Memory Alloys to Develop Self Post-Tensioned Concrete Bridge Girders

Post-tensioned (PT) structural elements are used quite often in bridges due to their ability to span long widths economically while providing an aesthetically pleasing structure. PT systems are also preferred in bridge construction because they greatly increase structural capacities and are fairly easy to implement effectively. Although PT systems provide many advantages for designers and constructors, these systems have raised concerns regarding corrosion of the PT tendons. The degree of corrosion of PT tendons is critical to the structural performance of PT systems and the cost to replace tendons can exceed several hundred thousand dollars per tendon. Shape memory alloys (SMAs) are a class of smart materials that have unique properties such as excellent re-centering ability, good energy dissipation capacity, excellent fatigue resistance, and high corrosion resistance. This project investigated the feasibility of developing self post-tensioned (SPT) bridge girders by activating the shape memory effect of SMAs using the heat of hydration of grout. In particular, the project investigated the temperature increase due to the heat of hydration of grout. A typical plastic cylinder was filled with grout at room temperature to monitor the temperature inside the duct during the grout’s hydration. Three commercially available grouts were considered in the tests: Euclid, Sika Grout 300 PT, and Five Star Special Grout 400. The grouts were mixed in accordance with the manufacturer’s recommendation. A single steel tendon was placed in the center. A thermocouple was attached at that tendon within the duct to measure the temperature. A data acquisition system was used to collect the temperature data for 48 hours. The variation of the temperature versus time was examined.

  • Record URL:
  • Supplemental Notes:
    • This document was sponsored by the U.S. Department of Transportation, University Transportation Centers Program.
  • Corporate Authors:

    University of Virginia, Charlottesville

    Center for Transportation Studies, P.O. Box 400742
    Charlottesville, VA  United States  22904-4742

    Mid-Atlantic Universities Transportation Center

    Pennsylvania State University
    201 Transportation Research Building
    University Park, PA  United States  16802-4710

    Research and Innovative Technology Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Authors:
    • Ozbulut, Osman E
  • Publication Date: 2013-8-13

Language

  • English

Media Info

  • Media Type: Digital/other
  • Edition: Final Report
  • Features: Figures; Photos; References; Tables;
  • Pagination: 19p

Subject/Index Terms

Filing Info

  • Accession Number: 01522380
  • Record Type: Publication
  • Report/Paper Numbers: UVA-2013-01
  • Contract Numbers: 140735-D; DTRT12-G-UTC03
  • Files: UTC, TRIS, RITA, ATRI, USDOT
  • Created Date: Mar 29 2014 4:10PM