Field device to measure viscosity, density, and other slurry properties in drilled shafts : final report.

Details

• Creators:
  Mullins, Gray ; Mullins, Miles
• Corporate Creators:
  University of South Florida. Department of Civil and Environmental Engineering
• Contributors:
  Castellano, Juan
• Corporate Contributors:
  Florida. Department of Transportation
• Subject/TRT Terms:
  Augercast Pile Density Drilled Shafts Excavation Measuring Instruments Measuring Methods Quality Assurance Slurry Thermal Integrity Test Viscosity
• Resource Type:
  Tech Report
• Geographical Coverage:
  United States
• Edition:
  Final report
• Corporate Publisher:
  Florida Department of Transportation
• Abstract:
  Proper performance of mineral slurries used to stabilize drilled shaft excavations is maintained by assuring the
  
  density, viscosity, pH, and sand content stay within state specified limits. These limits have been set either by
  
  past experience, research findings and/or by manufacturer recommended values. However, field slurry testing
  
  is time consuming as all measurements are manually performed. With the overwhelming advances in digital
  
  down-hole devices, it is not unreasonable to assume that slurry property tests are equally applicable to this
  
  trend.
  
  The most commonly used test to indicate slurry viscosity is the Marsh Funnel Test which is essentially a
  
  timed flow for a fixed volume of slurry to exit a falling head funnel. Using a library of unique pressure versus
  
  flow rate responses for a wide range of slurry viscosities, an automated downhole device was designed and
  
  tested that incorporated these information to estimate viscosity in the excavation without the need to remove
  
  slurry in order to test. Direct measurement of slurry density was also incorporated into the device and the sand
  
  content was computed from density and the viscosity where the suspended solids that make up the density
  
  stems from both the slurry products and the soil cuttings.
  
  The prototype down-hole slurry testing system was shown to be surprisingly easy and fast to use
  
  despite the experimental nature of the device. A shaft sampled at 6 different depths was tested in less
  
  than 10 minutes. In contrast, conventional, manually performed testing were estimated by contractors
  
  to have taken more than an hour to perform the same number of tests.
  
  
• Format:
  PDF
• Funding:
  BDV25 TWO977-09
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:1daffe05631ce71580ef0247b04b6c6f4ab0f20d7f6adb62ca7cce5202926529
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/31051/dot_31051_DS1.pdf
• File Type:
  [PDF - 20.87 MB ]