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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. FDOT Construction Conference Presented by: Sastry Putcha, P.E. Project Overview. The mechanism by which mineral and polymer slurries perform is quite different

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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

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