Bond Performance of 1.125 Inch Diameter Prestressing Strands

The public desires less disruption to highway services in addition to cheaper and more aesthetically pleasing structures. To meet these needs, engineers are continuously pushing the limits of current designs. One way to decrease the costs of an expensive structure is to limit the number of supports, provide longer span lengths, reduce the amount of materials and decrease construction time. In recent years, concrete bridges have benefited from larger diameter prestressing strands. Strands have gone from 0.5 in. to 0.6 in., mostly adopted as standard in the 1990s. In the mid 2000s research was underway to investigate larger strands and high strength strands (0.6 in. special, 0.7 in. and Grade 300). The largest available strands in the United States are 7-wire 0.7 in. diameter strands and are used sparingly in some early adoption states, despite several researchers finding that they can provide longer spans and more efficient structures with their use. The overarching goal of the proposed research is to investigate the use of 19-wire 1.125 in. diameter prestressing strand, purchased internationally, which has the potential to leapfrog several strand sizes. To accomplish this goal, the following more specific objectives have been identified: (1) Determine the level of cover required to ensure no splitting and bursting of 1.125 in. diameter strands. (2) Estimate the transfer length of 1.125 in. diameter prestressing strands. (3) Estimate the development length of 1.125 in. diameter prestressing strands. (4) Ensure the AASHTO LRFD specifications can predict the behavior of 1.125 in. diameter prestressing strand reinforced concrete members.

Language

  • English

Project

  • Status: Active
  • Funding: $ 280000
  • Contract Numbers:

    DTRT13-G-UTC28

    CAIT-UTC-NC51

  • Sponsor Organizations:

    Office of the Assistant Secretary for Research and Technology

    University Transportation Centers Program
    Department of Transportation
    Washington, DC  United States  20590
  • Managing Organizations:

    Center for Advanced Infrastructure and Transportation

    Rutgers University
    100 Brett Rd
    Piscataway, NJ  United States  08854-8058

    Insteel Wire Products

    1373 Boggs Drive
    Mount Airy, NC  United States  27030
  • Project Managers:

    Szary, Patrick

    Aubee, Paul

  • Performing Organizations:

    Utah State University, Logan

    Civil and Environmental Engineering Department
    Logan, UT  United States  84332
  • Principal Investigators:

    Maguire, Marc

    Sorensen, Andrew

  • Start Date: 20171215
  • Expected Completion Date: 20180930
  • Actual Completion Date: 0
  • USDOT Program: University Transportation Centers

Subject/Index Terms

Filing Info

  • Accession Number: 01677598
  • Record Type: Research project
  • Source Agency: Center for Advanced Infrastructure and Transportation
  • Contract Numbers: DTRT13-G-UTC28, CAIT-UTC-NC51
  • Files: UTC, RiP
  • Created Date: Aug 10 2018 12:24PM