Creep, Shrinkage and CTE Evaluation: MoDOT's New Bridge Deck Mix Companion Testing to HPC Bridge Deck

Missouri Department of Transportation (MoDOT) RDT Research Project R-I00-002 "HPC for Bridge A6130--Route 412 Pemiscot County" investigated the creep, shrinkage and coefficient of thermal expansion (CTE) of Missouri's first high performance concrete (HPC) superstructure bridge. This study examined these properties on both the prestressed concrete girders and the cast-in-place deck. In 2003, MoDOT studied 9 different mix designs for possible bridge deck applications. The objective was to reduce the content of cementitious material to reduce shrinkage, while maintaining good durability characteristics. One of these mixes was selected for use in an actual bridge deck application, MoDOT Bridge A6671 near Waynesville, Missouri. The objectives of the current research were: (1) to determine the creep, shrinkage and CTE properties of the A6671 deck mix.; (2) data analysis and curve fitting of the data obtained from A6671; and (3) to compare the properties with those of Bridge A6130 deck mix to gain an understanding of the variation that may be expected in these two deck mixes. The primary difference between the two mix designs was the cementitious content, with the coarse aggregate content also varying to some degree. Findings showed that the creep coefficient for deck mix A6671 at 180 days (after curve fitting) was 1.78 and the shrinkage strain was 367.2. The creep coefficient for deck mix A6671 was 19.3% lower than that of the bridge deck mix A6130. Shrinkage strain for deck mix A6671 was 9.8% lower than that of the bridge deck mix A6130. These findings indicate that a higher coarse aggregate content and lower water-cementitious material (w/cm) ratio results in a lower creep coefficient. A lower w/cm ratio with reduced cement content and more coarse aggregate results in less creep and less shrinkage. The deck mix for Bridge A6671 appears to have preferable creep, shrinkage and CTE characteristics for bridge deck applications compared to the mix design used for Bridge A6130.

• Record URL:
  • https://hdl.handle.net/10355/100067
• 
• Supplemental Notes:
  • This research was supported by a grant from the U.S. Department of Transportation, University Transportation Centers program.
• Corporate Authors:

  University of Missouri, Rolla

  Center for Infrastructure Engineering Studies
  1870 Miner Circle Drive
  Rolla, MO  United States  65409

  Missouri Department of Transportation

  Research, Development and Technology, 1617 Missouri Boulevard
  P.O. Box 270
  Jefferson City, MO  United States  65102

  Research and Special Programs Administration

  1200 New Jersey Avenue, SE
  Washington, DC  United States  20590
• Authors:
  • Myers, John
  • Joshi, Nidhi
  • La Gamma, Juan
• Publication Date: 2005-2

Language

• English

Media Info

• Media Type: Print
• Edition: Final Report
• Features: Figures; References; Tables;
• Pagination: 39p

Subject/Index Terms

• TRT Terms: Bridge decks; Cement; Cement content; Coarse aggregates; Coefficients; Concrete bridges; Creep; Creep tests; Curve fitting; High performance concrete; Highway bridges; Mix design; Shrinkage; Thermal expansion
• Uncontrolled Terms: Comparative analysis
• Geographic Terms: Missouri
• Subject Areas: Bridges and other structures; Design; Highways; Materials; I24: Design of Bridges and Retaining Walls; I32: Concrete;

Filing Info

• Accession Number: 01005717
• Record Type: Publication
• Report/Paper Numbers: UTC R85, RG001232 OT085, RDT04-023; RI00-002B
• Contract Numbers: DTRS98-G-0021 (Grant)
• Files: UTC, TRIS, USDOT, STATEDOT
• Created Date: Oct 21 2005 7:57AM