Performance-Based Specifications of Fiber-Reinforced Concrete with Adapted Rheology to Enhance Performance and Reduce Steel-Reinforcement in Structural Members

The main objective of this research is to propose novel materials for the construction and retrofitting of bridges, including Economical Crack-Free High-Performance Concrete (Eco-Bridge-Crete, or EBC) and Fiber-Reinforced Super-Workable Concrete (FR-SWC). The project seeks to optimize the coupled effect of fiber characteristics, expansive agent (EA), saturated lightweight sand (LWS), and external moist curing on mechanical properties, shrinkage, and corrosion resistance of such classes of high-performance concrete. The project also aims to replace steel reinforcement in flexural members with steel fibers partially. In Task I, Eco-Bridge-Crete mixture design was optimized to reduce drying and restrained expansion and secure high mechanical properties. Eco-Bridge-Crete mixtures were optimized using various shrinkage mitigating strategies, including the use of different contents of CaO-based EA, LWS, and steel fibers as well as different moist curing conditions. The study revealed some synergistic effects among the EA, LWS, and fiber contents and external curing that led to lower shrinkage and restrained expansion and greater strength. The combined use of EA, along with LWS, was shown to reduce concrete conductivity and improve corrosion resistance. Overall, the use of synthetic fibers, EA along with LWS, increased moist curing duration, and concrete cover depth was identified as suitable strategies for improving the corrosion resistance of Eco-Bridge-Crete mixtures. In Task II, the structural performance of reinforced concrete beams cast with FR-SWC mixtures made with different fiber types and reinforcing steel densities was evaluated. The testing involved casting of beam elements with different steel reinforcement densities (0.4 to 0.8 in.² of steel area in the tension zone).

• Record URL:
  https://spexternal.modot.mo.gov/sites/cm/CORDT/cmr20-006.pdf
• 
• Record URL:
  https://rosap.ntl.bts.gov/view/dot/53619
• Corporate Authors:

  Center for Transportation Infrastructure and Safety / NUTC program

  Missouri University of Science and Technology
  220 Engineering Research Lab
  Rolla, MO  United States  65409

  Missouri Department of Transportation

  Jefferson City, MO  United States  65102

  Federal Highway Administration

  1200 New Jersey Avenue, SE
  Washington, DC  United States  20590

  U.S. Department of Transportation

  1200 New Jersey Avenue, SE
  Washington, DC  United States  20590
• Authors:
  • Khayat, Kamal H
  • 0000-0003-1431-0715
• Publication Date: 2020-6

Language

• English

Media Info

• Media Type: Digital/other
• Edition: Final Report
• Features: Appendices; Figures; Photos; References; Tables;
• Pagination: 147p

Subject/Index Terms

• TRT Terms: Admixtures; Bridge construction; Corrosion resistance; Cracking; Durability; Fiber reinforced concrete; Flexural strength; Performance based specifications; Shrinkage; Steel fibers; Structural analysis
• Subject Areas: Bridges and other structures; Construction; Highways; Materials;

Filing Info

• Accession Number: 01743746
• Record Type: Publication
• Report/Paper Numbers: cmr 20-006, Project #00061652, TR201806
• Contract Numbers: MoDOT project # TR201806
• Files: NTL, TRIS, ATRI, USDOT, STATEDOT
• Created Date: Jun 23 2020 12:30PM