Development and evaluation of vibrating Kelly Ball Test (VKelly test) for the workability of concrete.

Details

• Creators:
  Taylor, Peter ; Wang, Xuhao ; Wang, Xin
• Corporate Creators:
  Iowa State University. National Concrete Pavement Technology Center
• Corporate Contributors:
  Iowa. Dept. of Transportation ; United States. Federal Highway Administration
• Subject/TRT Terms:
  • Concrete
  • Rheology
  • Workability
  • Vibration tests
  • Field tests
  • Laboratory tests
  • Slip form paving
  • Mix design
  • Evaluation
• Publication/ Report Number:
  TPF 5(205)
• Resource Type:
  Tech Report
• Geographical Coverage:
  Iowa
• Corporate Publisher:
  Iowa State University. Institute for Transportation
• Abstract:
  Due to the low workability of slipform concrete mixtures, the science of rheology is not strictly applicable for such concrete. However, ; the concept of rheological behavior may still be considered useful. A novel workability test method (Vibrating Kelly Ball or VKelly ; test) that would quantitatively assess the responsiveness of a dry concrete mixture to vibration, as is desired of a mixture suitable for ; slipform paving, was developed and evaluated. The objectives of this test method are for it to be cost-effective, portable, and repeatable ; while reporting the suitability of a mixture for use in slipform paving. ; The work to evaluate and refine the test was conducted in three phases: ; 1. Assess whether the VKelly test can signal variations in laboratory mixtures with a range of materials and proportions ; 2. Run the VKelly test in the field at a number of construction sites ; 3. Validate the VKelly test results using the Box Test developed at Oklahoma State University for slipform paving concrete ; The data collected to date indicate that the VKelly test appears to be suitable for assessing a mixture’s response to vibration ; (workability) with a low multiple operator variability. A unique parameter, VKelly Index, is introduced and defined that seems to ; indicate that a mixture is suitable for slipform paving when it falls in the range of 0.8 to 1.2 in./√s.
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• Format:
  PDF
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/28695/dot_28695_DS1.pdf
• File Type:
  [PDF - 1.08 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:6408bed73eb30baf56e3c25afa651a96fb1305cf64ac69b121ad2c0f52c46e4b51324e4ad50beeca9e9b7aa3c7f913266cd7c188ef453dcbceabe0f1f33fef96