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Evaluation of Hybrid Slurry Resulting from the Introduction of Additives to Mineral Slurry PowerPoint Presentation
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Evaluation of Hybrid Slurry Resulting from the Introduction of Additives to Mineral Slurry

Evaluation of Hybrid Slurry Resulting from the Introduction of Additives to Mineral Slurry

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Evaluation of Hybrid Slurry Resulting from the Introduction of Additives to Mineral Slurry

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  1. Evaluation of Hybrid Slurry Resulting from the Introduction of Additives to Mineral Slurry FDOT Construction Conference Presented by: Sastry Putcha, P.E.

  2. Project Overview • The mechanism by which mineral and polymer slurries perform is quite different • With the use of a hybrid slurry that shares traits from both mineral and polymer it is unclear on which set of specifications should be applied

  3. Project Tasks • Assess performance of hybrid slurry products as it pertains to state specifications • Develop a baseline to which hybrid slurry combinations will be compared • Review current slurry specifications relative to API Filter Press Testing • Establish criteria for hybrid materials

  4. Slurry Products

  5. Additive Products

  6. Slurry Testing • Viscosity • Density • API Filter Press (infiltration rate) • Sand Content • pH

  7. Testing Apparatus • API Filter Press • Specifications indicated to use dead weight / plunger system to achieve a constant 100 psi pressure • 100 psi never achieved, used in-house air system at a reliable 80 psi

  8. Testing Apparatus • Density • 1000 mL volumetric flask and a digital scale used to obtain accurate density measurements

  9. Testing Apparatus • Viscosity • Marsh funnel used to fill a smaller cross section container that provides consistent results between experimentalists

  10. State Spec 64 - 73pcf Slurry density results

  11. State Spec 28 – 40s/qt Slurry viscosity results

  12. State Spec 28 – 40s/qt API filter press flow rate versus viscosity (excluding attapulgite)

  13. State Spec 64 – 73pcf API filter press flow rate versus density (excluding attapulgite)

  14. 0.03 Required Wyo-Vis DP

  15. Settling Column Tests • Viscosity • Density • Sand Content at various depths • pH • Temperature • Sand Fallout Rate (accumulation on bottom of shaft)

  16. Ongoing / Future Work • Sand Settling rates for polymer fortified / hybrid slurry • Test additional additives • Establish sand content limits for hybrid slurries