Development of laboratory test methods to replace the simulated high-temperature grout fluidity test.

Details

• Creators:
  Hamilton, H.R. ; Schokker, A.J. ; Dave, E.V. ; Ferraris, C.F. ; Piper, Alexander D. ; Randell, Alexander ; Brunner, Brett
• Corporate Creators:
  University of Florida. Dept. of Civil and Coastal Engineering
• Corporate Contributors:
  Florida. Dept. of Transportation
• Subject/TRT Terms:
  • Bridge construction
  • Posttensioning
  • Grout
  • Fluidity
  • Viscosity
  • Laboratory tests
  • Shear tests
• Publication/ Report Number:
  BDK75-977-39 ; UF Project No. 00088488
• Resource Type:
  Tech Report
• Geographical Coverage:
  Florida
• Corporate Publisher:
  University of Florida
• Abstract:
  This report contains a summary of the research performed to develop a replacement for the high-temperature grout ; fluidity (HTGF) test. The HTGF test was employed in the past by FDOT to qualify post-tensioning (PT) grouts for use in ; post-tensioned bridge construction. The HTGF test, however, is expensive and cumbersome to conduct in a typical ; construction materials testing laboratory. ; The objective of this research project was to develop a replacement for the HTGF test using a dynamic shear rheometer ; (DSR). Initially, exploratory studies were conducted using a number of DSR test methods and geometries to develop or ; adopt a method that provides more consistent and rational rheological results than the currently used flow cone test method. ; These studies led to the adoption of the viscosity test with a cup and ribbon geometry. The shear rate used in the viscosity ; test (50 s-1) was based on data from the literature and from the estimated shear rate at the nozzle of a flow cone. ; In addition to the DSR test development, HTGF tests were conducted twice on four different commercially available PT ; grouts. PT grout temperatures increased an average of 7°F (4°C) over the course of the circulation during HTGF testing. ; Line pressures measured at the pump during circulation ranged from 100 to 350 psi (4 kPa to 17 kPa). ; Viscosity results measured during the HTGF test were correlated to performance of the PT grouts. The viscosity results ; compared well with flow cone results with an R2 value of 0.85. From these data, performance classifications were ; developed based on the results of the testing. ; Finally, DSR testing was conducted at University of Minnesota-Duluth (UMD) and National Institute of Standards and ; Technology (NIST) to provide a comparison of the viscosity results from these laboratories to those produced by the ; University of Florida. Trends in viscosity test results compared well with results from both UMD and NIST. Absolute ; magnitudes, however, varied somewhat. This is thought to be due to the sensitive nature of the mixing and conditioning ; process. Additional performance classifications were developed based on the findings of these studies.
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• Format:
  PDF
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/27753/dot_27753_DS1.pdf
• File Type:
  [PDF - 2.38 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:2acea86b2cb69d608eb43e5674094b986def65137cf9c84750279bc49abad525