Evaluation of Canadian unconfined aggregate freeze-thaw tests for identifying nondurable aggregates.

Details

• Creators:
  Mummaneni, Santosh K. ; Riding, Kyle A
• Corporate Creators:
  Kansas State University. Transportation Center ; Kansas State University. Department of Civil Engineering
• Corporate Contributors:
  Kansas. Dept. of Transportation. Bureau of Materials & Research ; University of Kansas. Transportation Center
• Subject/TRT Terms:
  • Aggregates
  • Aggregate mixtures
  • Aggregates by relationship to concrete
  • Concrete
  • Freeze thaw tests
  • Evaluation Aggregate
  • Concrete
  • Freeze-thaw testing
• Publication/ Report Number:
  K-TRAN: KSU-10-9
• Resource Type:
  Tech Report
• Geographical Coverage:
  Kansas
• Edition:
  Final report; July 2009-Sept. 2011.
• Corporate Publisher:
  Kansas. Dept. of Transportation
• Abstract:
  Concrete is the most widely used material in construction. Aggregates contribute 60% to 75% of the total volume ; of concrete. The aggregates play a key role in concrete durability. The U.S. Midwest has many aggregates that can ; show distress in the field under freezing and thawing conditions. The objective of this research was to determine if the ; Test Method for the Resistance of Unconfined Coarse Aggregate to Freezing and Thawing, CSA A23.2-24A, could be ; used to differentiate good from poor performing aggregates in concrete. In this study, thirty-nine different Kansas ; aggregates were tested for freeze thaw resistance using a version of the CSA A23.2-24A test method modified to ; account for the crushed aggregate sizes used in KDOT concrete paving specifications. These results were compared to ; those of standard KDOT aggregate qualification tests. Twelve of these aggregates were also tested using the gradation ; specified in the CSA A23.2-24A standard. In addition to performing the CSA test method using a 3% sodium chloride ; solution, a subset of the aggregates were tested using either a 3% magnesium chloride or calcium chloride solution to ; determine the effects of the salt type on the aggregate performance. No correlation was found between the CSA A23.2- ; 24A test method results and the standard KDOT aggregate qualification tests. The results also indicated that the mass ; loss in the CSA A23.2-24A was similar for the aggregate sizes tested. The use of CaCl2 solution in the CSA A23.2-24A ; test resulted in lower mass loss than the use of the NaCl solution.
  More +
• Format:
  PDF
• Funding:
  C1830
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/24468/dot_24468_DS1.pdf
• File Type:
  [PDF - 1.92 MB]
• Collection(s):
  University Transportation Centers ; US Transportation Collection
• Main Document Checksum:
  urn:sha-512:39418c1fa4d79a27c0bcc6d25ba234c6f8dd7209baa43eb148b819bd7940ae968cbf1c55c22975a4d5256f4d101b6614759a811a0ec2570971a143d2a3fd7de4