10. lvrm ch12 ukraine materials
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MATERIALS•Surfacing Standards Surfacing Standards •Soil and Aggregate PropertiesSoil and Aggregate Properties•Aggregate DesignAggregate Design•Soil StabilizationSoil Stabilization•CompactionCompaction•Quality Control/Sampling and TestingQuality Control/Sampling and Testing•Quarry Development and ReclamationQuarry Development and Reclamation
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Babeldoab Island, PalauHydrated tubular halloysite soilBob Gavenda NRCS
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Dust and Palliatives
D. Elton
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STABILIZERS AND DUST STABILIZERS AND DUST SUPPRESSANTSSUPPRESSANTS
• Cement, Lime, Fly Ash, Asphalt, Cement, Lime, Fly Ash, Asphalt, WaterWater
• Moisture Absorbing Products (Hygroscopic materials):Moisture Absorbing Products (Hygroscopic materials): Calcium chlorideCalcium chloride Magnesium chlorideMagnesium chloride Sodium chlorideSodium chloride
• Organic Petroleum Products:Organic Petroleum Products: Asphalt emulsionsAsphalt emulsions Liquid asphaltLiquid asphalt Dust oilsDust oils Modified asphalt emulsionModified asphalt emulsion
• Organic Non-Petroleum Products:Organic Non-Petroleum Products: LignosulfonatesLignosulfonates Animal FatsAnimal Fats Tree Resins, MolassesTree Resins, Molasses Tall Oils, Vegetable OilsTall Oils, Vegetable Oils
• Enzymes, Synthetic Polymers, Clay AdditivesEnzymes, Synthetic Polymers, Clay Additives
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Surfacing Alternatives
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Aggregate Use and Requirements
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Aggregate Surface Design (30 mm, high quality)
0
100
200
300
400
500
600
700
0 10000 20000 30000 40000 50000 60000
Traffic, 18-kip ESALs
Aggr
egat
e Th
ickn
ess,
mm
CBR - 3CBR - 5CBR - 8CBR - 12
Aggregate Surface Design for 30mm Minus Aggregate of High Quality
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Quality Control
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DCP
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You Get What You Inspect, Not What You Expect
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Compaction
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Drainage
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Separation/Reinforcement
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Unpaved Road DesignUnpaved Road Design00
2020
4040
6060
8080
100100
120120
00
0.50.5
1.01.0
1.51.5
2.02.0
2.52.5
3.03.0
3.53.5
4.04.0
0011
223344
55667788
9910101111
12121313
CO
NE
IND
EXC
ON
E IN
DEX
CB
RC
BR
SHEA
R S
TREN
GTH
, PSI
(C)
SHEA
R S
TREN
GTH
, PSI
(C)
Relationship between shear strength, CBR, & cone indexRelationship between shear strength, CBR, & cone index
C = 4.8 PSIC = 4.8 PSIFOR CBR = 1FOR CBR = 1
BearingCapacityFactors
Unreinforced:
With Geotextile:
With Geogrid/Geotextile: Typically CBR < 4
NNCC = 2.8 = 2.8
NNCC = 5.0 = 5.0
NNCC = 5.7 = 5.7
With Geogrid: (CBR > 4)
NNCC = 5.7 = 5.7
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24 “
15 “13 “
WITHOUT GEOTEXTILE
WITH GEOTEXTILE
WITH GEOGRID/GEOTEXTILE
Unpaved Road DesignUnpaved Road Design
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Materials RemovalBlack Cotton Soil
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Materials Improvement
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Grid RollerGrid Roller
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Roadside Borrow Areas
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Quarry Developmentand Reclamation
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What is Important?What is Important?• Know your Soils and Traffic• Select the Appropriate Surfacing Standard• Use Appropriate Aggregate Gradation• Consider In-place Soil Stabilization• Use Cost-Effective Local Materials• Use Adequate Q C /Sampling & Testing • Compact your Soils and Aggregates• Drain your Materials• Develop Quarries…then Reclaim Them
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