Effectiveness of fly ash replacement in the reduction of damage due to alkali-aggregate reaction in concrete.

Details

• Alternative Title:
  Alkali-aggregate reaction in concrete containing fly ash.
• Creators:
  Farbiarz, Josef ; Carrasquillo, Ramon
• Corporate Creators:
  University of Texas at Austin. Center for Transportation Research
• Corporate Contributors:
  Texas. Department of Highways and Public Transportation. Transportation Planning Division ; United States. Federal Highway Administration
• Subject/TRT Terms:
  • Alkali aggregate reactions
  • Fly ash
  • Aggregates
  • fly ash
  • concrete
  • damage reduction
  • alkali-aggregate
  • 90-day exposure
  • comparative study
• Publication/ Report Number:
  FHWA/TX-87/15+450-1
• Resource Type:
  Tech Report
• Geographical Coverage:
  Texas
• Corporate Publisher:
  Texas. Department of Highways and Public Transportation. Transportation Planning Division
• Abstract:
  The concrete industry is faced with the urgent need of improving its knowledge ; about the mechanism by which fly ash helps in the reduction of damage due to ; alkali-aggregate reaction in concrete to acceptable levels. ; The main objective of this research was to identify the most relevant ; components of fly ash, cement, and concrete aggregates affecting the alkaliaggregate ; reaction, and to find a relationship between them, indicating type and ; amount of a given component acceptable for use in concrete to ensure no damage due ; to alkali-aggregate reaction. The research approach used in this investigation was ; to conduct a comparative study of the behavior of several mixes made using several ; aggregate sources in combination with cements with high and low alkali content, and ; containing different types of fly ash at different replacement percentages. ; The variables studied included: ; (1) alkali content of the cement, ; (2) available alkali content of the fly ash, ; (3) degree of alkali reactivity of the aggregate, ; (4) type and source of fly ash, and ; (5) percentage of cement replaced. ; Test results presented in this report are limited to 90-day exposure testing. ; However, exposure testing of all specimens will continue until the 24-month test ; age and the results will be included in later reports.
  More +
• Format:
  PDF
• Funding:
  Research Study 3-9-85-450
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/31643/dot_31643_DS1.pdf
• File Type:
  [PDF - 3.23 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:fba5e15971ea1cc79958bac965e7934e5449cf5470323a53156d96e7afee5816