evaluation of hybrid slurry resulting from the introduction of additives to mineral slurry fdot...
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![Page 1: Evaluation of Hybrid Slurry Resulting from the Introduction of Additives to Mineral Slurry FDOT Construction Conference Presented by: Sastry Putcha, P.E](https://reader035.vdocuments.site/reader035/viewer/2022062407/56649d885503460f94a6d5dd/html5/thumbnails/1.jpg)
Civil & Environmental EngineeringCivil & Environmental Engineering
Evaluation of Hybrid Slurry Resulting from the Introduction of Additives to Mineral Slurry
FDOT Construction Conference
Presented by: Sastry Putcha, P.E.
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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
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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
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Slurry Products
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Additive Products
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Slurry Testing
Viscosity Density API Filter Press
(infiltration rate) Sand Content pH
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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
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Testing Apparatus
Density 1000 mL volumetric flask
and a digital scale used to obtain accurate density measurements
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Testing Apparatus
Viscosity Marsh funnel used to fill
a smaller cross section container that provides consistent results between experimentalists
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Slurry density results
State Spec 64 - 73pcf
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Slurry viscosity results
State Spec 28 – 40s/qt
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API filter press flow rate versus viscosity (excluding attapulgite)
State Spec 28 – 40s/qt
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API filter press flow rate versus density (excluding attapulgite)
State Spec 64 – 73pcf
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Required Wyo-Vis DP
0
0.05
0.1
0.15
0.2
0.25
0.3
0 10 20 30 40 50 60
Pure Gold Mix Ratio (lb dry powder/100 gal)
Addi
tive
Requ
ired
(lb/1
00 g
al)
30 s/qt35 s/qt40 s/qt
0.03
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Settling Column Tests
Viscosity Density Sand Content at
various depths pH Temperature Sand Fallout Rate
(accumulation on bottom of shaft)
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0.00
2.00
4.00
6.00
8.00
10.00
12.00
14.00
0 5 10 15 20 25
Sand Content (%)
Dept
h (ft
)0 min 15 min30 min 60 min120 min 240 min1440 min
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0.00
2.00
4.00
6.00
8.00
10.00
12.00
14.00
0 5 10 15 20 25
Sand Content (%)
Dept
h (ft
)
0 min 15 min30 min 60 min120 min 240 min
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Ongoing / Future Work
Sand Settling rates for polymer fortified / hybrid slurry
Test additional additives Establish sand content limits for hybrid
slurries