Calcium Sulfoaluminate Cement Concrete for Prestressed Bridge Girders: Prestressing Losses, Bond, and Strength Behavior

Calcium sulfoaluminate (CSA) cement was used to cast a prestressed voided deck slab bridge girder. The rapid-set properties of CSA cement allowed the initial concrete strength to reach the required 4300 psi needed in order to cut the prestressing strands 6.5 hours after casting. Prestress losses were monitored long term using vibrating wire strain gages cast into the concrete at the level of the prestressing strands, and the data were compared to the American Association of State Highway and Transportation Officials Load and Resistance Factor Design (AASHTO LRFD) predictions for prestress losses. AASHTO methods for prestress loss calculation were overestimated compared with the vibrating wire strain gage data. Material testing was performed to quantify material properties, including compressive strength, tensile strength, static and dynamic elastic modulus, creep, and drying and autogenous shrinkage. The material testing results were compared with AASHTO predictions for creep and shrinkage losses. The bridge girder was tested at midspan and a distance 1.25 times the depth of the beam from the face of the support until failure. Midspan testing consisted of a crack reopening test to solve for the effective prestress in the girder and a test until failure. The crack reopen effective prestress was compared with the AASHTO prediction, and AASHTO appeared to be effective in predicting losses based on the crack reopen data. The midspan failure was a shear failure, as accurately predicted by AASHTO. The 1.25d test resulted in a bond failure, which was accurately predicted by the AASHTO bond model for prestressed concrete.

• Record URL:
  https://www.ugpti.org/resources/reports/details.php?id=985
• Record URL:
  https://rosap.ntl.bts.gov/view/dot/56151
• Supplemental Notes:
  • This document was sponsored by the U.S. Department of Transportation, University Transportation Centers Program.
• Corporate Authors:

  Utah State University, Logan

  Logan, UT  United States  84322-4110

  Mountain-Plains Consortium

  North Dakota State University
  Fargo, ND  United States  58108

  Office of the Assistant Secretary for Research and Technology

  University Transportation Centers Program
  Department of Transportation
  Washington, DC  United States  20590
• Authors:
  • Markosian, Nicholas A
  • Thomas, Robert
  • Maguire, Marc
  • Sorensen, Andrew
• Publication Date: 2019-12

Language

• English

Media Info

• Media Type: Digital/other
• Edition: Final Report
• Features: Figures; Photos; References; Tables;
• Pagination: 85p

Subject/Index Terms

• TRT Terms: Aluminous cement; Bond strength (Materials); Calcium sulfates; Creep; Failure analysis; Girders; Highway bridges; Materials tests; Mechanical properties; Prestressed concrete; Prestressing; Shrinkage
• Subject Areas: Bridges and other structures; Highways; Materials;

Filing Info

• Accession Number: 01739511
• Record Type: Publication
• Report/Paper Numbers: MPC-19-401
• Contract Numbers: MPC-560
• Files: UTC, NTL, TRIS, ATRI, USDOT
• Created Date: May 18 2020 11:29AM