A Targeted Approach to High-Volume Fly Ash Concrete Pavement (Phase I Report)

Unlike the conventional method of admixing nanomaterials directly in fresh concrete mixture, a more targeted approach was explored. Specifically, nanomaterials were used to improve the interface between coarse aggregate and cement paste, by coating the coarse aggregate with cement paste that contained graphene oxide or nanosilica. Using coated coarse aggregates, the mechanical and transport properties of high-volume fly ash (HVFA) concrete were tested to evaluate the effect of nanomaterial coating on the interface transition zone of concrete. The compressive and splitting strengths of HVFA concrete at 3, 7, 14, and 28 days and the water sorptivity and chloride migration coefficient at 28 days were studied. Results show that nanomaterial-coated coarse aggregate can improve the transport properties of HVFA concrete by reducing permeability. However, no improvement was seen in the compressive and splitting strengths when incorporating coated coarse aggregate, compared with direct mixing of nanomaterials in fresh concrete. Resistance to freezing/thawing cycles and scanning electron microscope/energy dispersive X-ray spectroscopy of concrete samples were also investigated to obtain a more comprehensive and mechanistic understanding of nanomaterial coating.

• Record URL:
  https://scholarworks.alaska.edu/bitstream/handle/11122/9765/HVFAC_Shi_Final_Report.pdf?sequence=1
• Record URL:
  https://rosap.ntl.bts.gov/view/dot/66979
• Corporate Authors:

  U.S. Department of Transportation

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

  Washington State University

  Pullman, WA  United States  99164

  University of Alaska, Fairbanks

  Center for Environmentally Sustainable Transportation in Cold Climates
  Duckering Building Room 245, P.O. Box 755900
  Fairbanks, AL  United States  99775-5900
• Authors:
  • Du, Sen
  • Shi, Xianming
• Publication Date: 2018-6

Language

• English

Media Info

• Media Type: Digital/other
• Edition: Final Report
• Features: Figures; Photos; References; Tables;
• Pagination: 71p

Subject/Index Terms

• TRT Terms: Admixtures; Coarse aggregates; Concrete pavements; Fly ash; Nanostructured materials
• Subject Areas: Highways; Materials; Pavements;

Filing Info

• Accession Number: 01695286
• Record Type: Publication
• Report/Paper Numbers: INE/AUTC 18.11, INE/CESTiCC 18.11
• Files: NTL, TRIS, ATRI, USDOT
• Created Date: Feb 21 2019 9:49AM