An Investigation of Low Strength PCC Test Results Utilizing Concrete Temperature Loggers

This report presents results of a study to assess Connecticut Department of Transportation's (ConnDOT's) portland cement concrete (PCC) testing methods. The study was designed in order to investigate why some cured PCC specimens did not attain required 28-day strength, even though investigations of these low-strength test results revealed that many in-place PCC strengths were actually acceptable. Statistical analyses of historical data were performed with SPSS® statistical software to identify when low-strength test results occur most often, and what PCC mix types are most problematic. Results showed that PCC rejections occur most often, on a percentage basis, during the summer months, and that higher strength mix types (≥ 3500 psi) are most problematic. Next, researchers made and cured test specimens side-by-side with construction inspectors to assess testing methods. Temperature and maturity probes were embedded in 6"x12" cylindrical specimens and in-place concrete structures to monitor curing. Based upon a literature review, observations, and data collected in the field, it appears many of ConnDOT's PCC rejections occur as a result of elevated temperatures during initial curing of cylindrical PCC test specimens.

  • Corporate Authors:

    Connecticut Department of Transportation

    Division of Research, 280 West Street
    Rocky Hill, CT  United States  06067-3502

    Connecticut Department of Transportation

    2800 Berlin Turnpike
    Newington, CT  United States  06131

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Authors:
    • Henault, John W
  • Publication Date: 2007-1


  • English

Media Info

  • Media Type: Print
  • Features: Figures; References; Tables;
  • Pagination: 26p

Subject/Index Terms

Filing Info

  • Accession Number: 01046408
  • Record Type: Publication
  • Report/Paper Numbers: 2244-2-07-1, CT-2244-2-07-1
  • Contract Numbers: CT Study No. SPR-2244
  • Created Date: Apr 19 2007 9:59PM