A High-Volume Fly-Ash Concrete Mixture for Tennessee Bridge Decks

High Volume Fly Ash (HVFA) portland cement concrete (PCC) was developed to compete with the Tennessee Department of Transportation (TDOT) Class D PCC. HVFA PCC is PCC with at least 50 percent of portland cement (PC) replaced with Class C fly ash. The current TDOT allowable PC replacement rate is 25 percent for Class C fly ash. A higher PC replacement rate would greatly increase the use of an industrial byproduct thus making more efficient use of natural resources. However, performance and economy cannot be sacrificed for environmental concerns. This paper addresses HVFA PCC performance and not environmental benefits. HVFA PCC has lower total cementing materials and water contents than TDOT Class D PCC. HVFA PCC is similar in material costs below a placement temperature of 85°F (29.4°C) and cheaper at a placement temperature of 85°F (29.4°C) and above. The results of the research show first that HVFA PCC meets all TDOT 604.03 Class D PCC property requirements. Second, that HVFA PCC is statistically superior to TDOT Class D PCC in compressive strength (at 7 to 182 days), static modulus of elasticity (28 to 182 days), hardened concrete absorption (28 to 182 days) and rapid chloride permeability (at 91 days). Finally, that above 85°F (29.4°C), hot HVFA PCC hardened properties and rapid chloride permeability are statistically superior to hot TDOT Class D PCC (at 7 to 182 days).

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• Supplemental Notes:
  • This paper was sponsored by TRB committee AFN40 Concrete Materials and Placement Techniques. Alternate title: High-Volume Fly-Ash Concrete Mixture for Tennessee Bridge Decks.
• Corporate Authors:

  Transportation Research Board

  500 Fifth Street, NW
  Washington, DC  United States  20001
• Authors:
  • Crouch, L K
  • Crowley, Aaron
  • Badoe, Daniel
  • Hall, Heather P
• Conference:
  • Transportation Research Board 93rd Annual Meeting
  • Location: Washington DC
  • Date: 2014-1-12 to 2014-1-16
• Date: 2014

Language

• English

Media Info

• Media Type: Digital/other
• Features: Figures; References; Tables;
• Pagination: 18p
• Monograph Title: TRB 93rd Annual Meeting Compendium of Papers

Subject/Index Terms

• TRT Terms: Bridge decks; Compressive strength; Fly ash; Modulus of elasticity; Moisture content; Permeability; Portland cement concrete
• Identifier Terms: Tennessee Department of Transportation
• Subject Areas: Highways; Materials; I32: Concrete;

Filing Info

• Accession Number: 01514926
• Record Type: Publication
• Report/Paper Numbers: 14-0949
• Files: PRP, TRIS, TRB, ATRI
• Created Date: Feb 21 2014 3:16PM