Alternate Mitigation Materials for Alkali-Silica Reaction (ASR) in Concrete

Details

• Creators:
  Ballard, Zachoria J. ; Caires, William S. ; Peters, Stanley R.
• Corporate Creators:
  J. A. Cesare & Associates, Inc.
• Corporate Contributors:
  Colorado Department of Transportation. Office of Applied Research ; United States. Department of Transportation. Federal Highway Administration
• Subject/TRT Terms:
  Class F Fly Ash Class N Pozzolan Contractors Evaluation Fly Ash Laboratory Tests Literature Reviews Metakaolin Permeability Pozzolan Pozzolanic Material Procedures State Departments Of Transportation Traffic Mitigation

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• Publication/ Report Number:
  CDOT-2008-10
• Resource Type:
  Tech Report
• Geographical Coverage:
  United States
• Corporate Publisher:
  Colorado Department of Transportation. Applied Research & Innovations Branch
• Abstract:
  Contractors are finding it difficult to obtain Class F fly ash for concrete paving projects, but CDOT specifications do not currently allow Class N pozzolan to be substituted for Class F fly ash. The purpose of this study was to determine the effectiveness of Class N pozzolan and other pozzolans for mitigating alkali-silica reaction (ASR) and resisting sulfate attack. First, a literature review was performed to find research on Class N pozzolan. Second, other state departments of transportation (DOTs) were contacted to determine if Class N pozzolan is used and how it is specified. Third, laboratory tests were conducted to determine the effectiveness of Class N pozzolan and other materials in mitigating ASR when compared to Class F fly ash. Using one source of Class F fly ash, one source of Class N pozzolan, and one source of reactive aggregate (fine and course), the effectiveness of Class N was determined by testing each combination in accordance to Colorado Procedures CP-L 4201 and CP-L 4202. Class N pozzolan was found to be effective in mitigating ASR. Once the effectiveness of Class N and other products tested was determined, further testing on Class D mix design was performed for potential effects on fresh and hardened concrete. Testing included entrained air on plastic concrete, rapid chloride permeability (ASTM C1202-05), and compressive strength at 7, 28, and 56 days.
• Format:
  PDF
• Funding:
  16.20
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:e58bb1f75673a3e23922ea0824fb7b8ed6598895cf87cf5ba11c65c1b4a88f9495381ca16cbe53f7dc5188e632aa3d105587f00b8caa20beadb73b5fb07a7ad6
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/92938/dot_92938_DS1.pdf
• File Type:
  [PDF - 2.39 MB ]