Alkali Reactivity of Concrete Aggregates

Details

• Creators:
  Ramakrishnan, V. ; Ramachandran, Suresh
• Corporate Creators:
  South Dakota School of Mines & Technology
• Corporate Contributors:
  South Dakota. Department of Transportation. Office of Research
• Subject/TRT Terms:
  • Asphalt
  • Aggregates
  • Pavements
  • Pavement performance
  • Alkali aggregate reactions
  • Fly ash
  • Sand
  • Surface treating
  • asphalt surface treatment
• Publication/ Report Number:
  SD90-01
• Resource Type:
  Tech Report
• Geographical Coverage:
  South Dakota ; United States
• Edition:
  Final Report May 1990 to June 1991
• Corporate Publisher:
  South Dakota. Department of Transportation. Office of Research
• Abstract:
  This report presents the results of a study to determine whether aggregates are reactive and to determine the influence of fly ash in reducing the expansion due to alkali-aggregate reaction. Ten sand samples collected from various locations in South Dakota were supplied by the South Dakota Department of Transportation. The sands were tested for chemical composition and mineralogical content by Refractive Intensity Method of Quantitative Xray diffraction analysis. The sands were also tested for chert content by Polarizing Optical Microscopy. The alkali-aggregate reactivity of the sands was determined by standard ASTM C227 and accelerated test methods CSA CAN-A23.2-XXC. Five sands which expanded most were selected and tested with fly ash contents of 10% to 70% by weight using the accelerated test method. The water to fly ash plus cement ratio of 0.44 was used for the entire investigation. Mortar bar specimens were prepared according to ASTM C227. The tests identified the sands which are reactive. High fly ash replacement levels effectively reduced AAR expansions. Expansions for the five reactive sands incorporating high volumes of fly ash were negligible.
• Format:
  PDF
• Funding:
  303418
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/80134/dot_80134_DS1.pdf
• File Type:
  [PDF - 23.82 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:8eefff0a4d356166e0a11c4c8b66084e428cdc3bad187b49d4c3ca756d00e6baf71f71d7c115acdf51afd322ed3e1101fc61d763cee207da23aa27442bf97ba2