Bond Characteristics of Self-consolidating Concrete for Prestressed Bridge Girders

This paper discusses results of an extensive experimental program conducted to determine the material and bond characteristics of a proposed self-consolidating concrete (SCC) mixture for bridge girders. 15 full-scale, pretensioned SCC specimens were tested to evaluate the transfer and development lengths of their strand. These specimens included both single- and multiple-strand beams, as well as specimens designed to evaluate the so-called "top-strand" effect. Top-strand effect specimens, each with more than 20 in. of concrete below the strand, were tested to evaluate the current American Association of State Highway and Transportation Officials (AASHTO) requirement. AASHTO requires a 30% increase in the strand development length when there is more than 12 in. of concrete below the strand. Before placing SCC in the beams, the prestressing strand was pre-qualified using the large block pullout test. Strand end-slip measurements, used to estimate transfer lengths, indicated that the proposed SCC allows strand to meet the ACI and AASHTO transfer-length requirements. In addition, flexural tests on the same specimens confirmed that the SCC also meets the current code requirements for development length. Furthermore, test results indicate that a 30% increase in development length was not necessary to achieve the full tensile capacity of the strand in the top-strand-effect specimens.

  • Availability:
  • Authors:
    • Larson, Kyle H
    • Peterman, Robert J
    • Esmaeily, Asad
  • Publication Date: 2007-7

Language

  • English

Media Info

  • Media Type: Print
  • Features: Appendices; Figures; Photos; References;
  • Pagination: pp 44-57
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 01054295
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jul 24 2007 6:10PM