Design and evaluation of high-volume fly ash (HVFA) concrete mixes.

Details

• Creators:
  Volz, Jeffery S. ; Myers, John J. ; Richardson, David N. ; Arezoumandi, Mahdi ; Beckemeier, Karl ; Davis, Drew ; Holman, Kyle ; Looney, Trevor ; Tucker, Brian
• Corporate Creators:
  Missouri University of Science and Technology
• Subject/TRT Terms:
  • Fly ash
  • Portland cement concrete
  • Admixtures
  • Setting (Concrete)
  • Waste products (Cargo)
  • Durability
  • Mix design
  • Reinforced concrete Portland cement--Additives--Testing
  • Fly ash
  • Pavements, Reinforced concrete--Design and construction
• Publication/ Report Number:
  TRyy1110;cmr 13-008
• Resource Type:
  Tech Report
• Geographical Coverage:
  Missouri
• Edition:
  Final report.
• Corporate Publisher:
  Missouri. Department of Transportation
• Abstract:
  Concrete is the world’s most consumed man-made material. Unfortunately, the production of portland cement, the active ; ingredient in concrete, generates a significant amount of carbon dioxide. For each pound of cement produced, approximately one ; pound of carbon dioxide is released into the atmosphere. With cement production reaching nearly 6 billion tons per year ; worldwide, the sustainability of concrete is a very real concern. ; Since the 1930’s, fly ash – a pozzolanic material – has been used as a partial replacement of portland cement in concrete to ; improve the material’s strength and durability, while also limiting the amount of early heat generation. From an environmental ; perspective, replacing cement with fly ash reduces concrete’s overall carbon footprint and diverts an industrial by-product from ; the solid waste stream (currently, about 40 percent of fly ash is reclaimed for beneficial reuse and 60 percent is disposed of in ; landfills). ; Traditional specifications limit the amount of fly ash to 25 or 30 percent cement replacement. Recent studies, including those ; by the investigators, have shown that higher cement replacement percentages – even up to 75 percent – can result in excellent ; concrete in terms of both strength and durability. Referred to as high-volume fly ash (HVFA) concrete, this material offers a ; viable alternative to traditional portland cement concrete and is significantly more sustainable. By nearly doubling the use of ; reclaimed fly ash in concrete, HVFA concrete aligns well with MoDOT’s green initiative on recycling. ; However, HVFA concrete is not without its problems. At all replacement rates, fly ash generally slows down the setting time ; and hardening rates of concrete at early ages, especially under cold weather conditions, and when less reactive fly ashes are used. ; Furthermore, with industrial by-products, some variability in physical and chemical characteristics will normally occur, not only ; between power plants but also within the same plant. Consequently, to achieve the benefits of HVFA concrete, guidelines are ; needed for its proper application in bridges, roadways, culverts, retaining walls, and other transportation-related infrastructure ; components. ; The objective of this research was to design, test, and evaluate HVFA concrete mixtures. The study focused on the hardened ; properties of HVFA concrete containing aggregates and fly ash indigenous to the state of Missouri and developed guidelines on ; its use in infrastructure elements for MoDOT.
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• Format:
  PDF
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/25525/dot_25525_DS1.pdf
• File Type:
  [PDF - 796.37 KB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:01199a45034d4b6a6151e24e6aa792636803489d3f398d86f20101c53882811c0ea79253116a8891e68d3fac770acf5a91ca51ed439dcaad03fec39eaaf1f3ab