Designing FullDesigning Full--Depth Depth Reclamation ... Guthrie - Design Full... · Designing...
Transcript of Designing FullDesigning Full--Depth Depth Reclamation ... Guthrie - Design Full... · Designing...
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Designing FullDesigning Full--Depth Depth ReclamationReclamationReclamationReclamationProjects for Urban AreasProjects for Urban Areas
W. Spencer Guthrie, Ph.D.Associate ProfessorAssociate Professor
Department of Civil and Environmental Engineering, Brigham Young Universityg g, g g y
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INTRODUCTIONINTRODUCTION• Pavement engineers and managers arePavement engineers and managers are
focusing increasingly on preservation of existing roadwaysexisting roadways
• Availability of high quality aggregates is diminishing in many areasdiminishing in many areas
• Funding for road reconstruction remains li it d hil t l tilimited while costs are escalating
• Drivers have high expectations for pavement serviceability
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ASCE Infrastructure Report CardASCE Infrastructure Report Card
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FULLFULL--DEPTH RECLAMATIONDEPTH RECLAMATION• FDR consists of in-situ pulverization of a
typically failed asphalt layer with a portion of the underlying base to create a new basethe underlying base to create a new base layer
• FDR is most commonly used to rebuildFDR is most commonly used to rebuild structurally failed asphalt pavements generally exhibiting at least 20% fatigue
ki th 0 5 i f tticracking or more than 0.5 in. of rutting• FDR is both economically and
environmentally friendlyenvironmentally friendly
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FullFull--Depth Reclamation: Depth Reclamation: Reclaiming the Asphalt PavementReclaiming the Asphalt PavementReclaiming the Asphalt PavementReclaiming the Asphalt Pavement
Schematic courtesy MN DOT
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Advantages of the FDR ProcessAdvantages of the FDR Process• Uses in-place materials
gg
• Requires little or no material to be hauled offMaintains or improves• Maintains or improves existing grade
• Conserves virgin materialConserves virgin material• Saves cost by using
in-place “investment”in place investment• Saves energy by reducing
mining and hauls• Is a very sustainable
process
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Economic Benefits of FullEconomic Benefits of Full--Depth Depth R l ti (f PCA)R l ti (f PCA)Reclamation (from PCA)Reclamation (from PCA)
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Effect of RAP ContentEffect of RAP Content
• Blending with RAP can also 60
70
lead to reductions in structural 30
40
50
BR
(%)
structural quality of aggregate 10
20
30
CB
aggregate base materials
00 25 50 75 100
RAP Content (%)
B1 B2
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Base Material PropertiesBase Material Properties
250
300
350
R (%
)_
150
200
250
ge B
ase
CBR
0
50
100
Ave
rag
Just beforeReclamation
Just afterReclamation
1 Year afterReclamation
Orem San Marcos South Jordan
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Benefits of FDR Using CementBenefits of FDR Using Cementgg• Increased rigidity
f di t ib ti l dfor distributing loads• Elimination of rutting
below surfacebelow surface• Reduced moisture and
frost susceptibilityp y• Reduced fatigue
cracking• Thinner pavement
sections
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Stress Distribution
Wheel Load
AsphaltTensile Strain -cracking p
U t t d
cracking
Untreated Base
SubgradeCompressive strain -i Subgraderutting
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Stress Distribution
Wheel Load
AsphaltTensile Strain -cracking pcracking
CTB
SubgradeCompressive strain -i Subgraderutting
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CementCement--Based Pavement Based Pavement M t i lM t i l
Roller-Compacted Conventional
MaterialsMaterialsPerviousp
Concrete ConcretePerviousConcrete
ent Soil-Cement
ent C
onte
Flowable Fill
Cement-Treated
Base
Cem
e Flowable Fill
Cement-ModifiedSoil
Full-DepthReclamation
Water Content
Soil
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FDR Construction ProcessFDR Construction ProcessPulverize, Shape, Add Cement, Mix In Place,
Compact, and Surface
Bituminous New Surfacing
GranularBase
SurfacingPulverized
Pulverized Stabilized Stabilized
New Surfacing
Base
Subgrade Subgrade Subgrade Subgrade Subgrade
Existingroad
Pulverizationto desired
Removal ofexcess
Addition of cement,
Application of final surface
depth material (if necessary)and shaping
mixing, reshaping, and
compacting
final surface course
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Failed PavementFailed Pavement
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PulverizationPulverization
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ReshapingReshaping
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Spreading Cement SlurrySpreading Cement Slurry
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Spreading Cement SlurrySpreading Cement Slurry
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Cement UniformityCement Uniformity
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Spreading Cement SlurrySpreading Cement Slurry
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Spreading Cement PowderSpreading Cement Powder
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Material BlendingMaterial Blending
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CompactionCompaction
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GradingGrading
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CuringCuring
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Minimal DisruptionMinimal Disruption
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MicrocrackingMicrocracking
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MicrocrackingMicrocracking
• Purpose is to minimize propagation of CTB shrinkage cracks into asphalt surface course
• Process involves providing moist curing for 2 to 3 days, rolling at maximum vibration and l d t t i k dslow speed to create microcracks, and
providing moist curing for another 2 to 3 daysR lli h ld t h th tiff f th• Rolling should stop when the stiffness of the layer decreases by 40 to 50%
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MicrocrackingMicrocracking
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Reflection Cracking from Reflection Cracking from Heavily Stabilized CTB LayerHeavily Stabilized CTB LayerHeavily Stabilized CTB LayerHeavily Stabilized CTB Layer
Photo Courtesy of Tom Scullion, TTI
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CTB Field TestingCTB Field TestingCTB Field TestingCTB Field Testing
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SurfacingSurfacing
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PavementPavement AnalysisAnalysis• Service Life = 20 years• Design Equivalent Single Axle Loads =3 in. HMA • Design Equivalent Single Axle Loads =
15,000• Overall Standard Deviation = 0.45
Initial Serviceability 4 5New Surfacing8 in. CTB
• Initial Serviceability = 4.5• Terminal Serviceability = 2.0• Asphalt Structural Layer Coefficient =
Subgrade
0.40• Cement-Treated Base Structural Layer
Coefficient = 0.18Final
Pavement St t • Drainage Coefficient = 1.0
• Subgrade Resilient Modulus = 15 ksi
Structure
Cost = 20% Less than Traditional ReconstructionCost = 20% Less than Traditional ReconstructionCost = 20% Less than Traditional ReconstructionCost = 20% Less than Traditional ReconstructionReliability = 99%Reliability = 99%
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Material SamplingMaterial Sampling
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Determining Asphalt Determining Asphalt ThicknessThicknessThicknessThickness
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Material SamplingMaterial Sampling
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Material SamplingMaterial Sampling
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CalciumCalcium--Induced Heave of Induced Heave of SulfateSulfate Bearing SoilBearing Soil (ASTM C1580)SulfateSulfate--Bearing Soil Bearing Soil (ASTM C1580)
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CalciumCalcium--Induced Heave of Induced Heave of SulfateSulfate Bearing SoilBearing Soil (ASTM C1580)SulfateSulfate--Bearing Soil Bearing Soil (ASTM C1580)
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Soil Classification and Selection Soil Classification and Selection of Trial Cement Contentsof Trial Cement Contents
ASTM C136ASTM D4318ASTM D4318
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Determining RAPDetermining RAP--Base RatioBase RatioDetermining RAPDetermining RAP Base Ratio Base Ratio for Material Weighfor Material Weigh--OutsOuts
FDR layer thickness should generally not exceed 8 to 10 in forFDR layer thickness should generally not exceed 8 to 10 in. for single-lift construction
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Slurry PreparationSlurry Preparation
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Slurry PreparationSlurry Preparation
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Slurry Aging and Slurry Aging and Proportioning for AggregateProportioning for Aggregate
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Mixing Slurry with AggregateMixing Slurry with Aggregateg y gg gg y gg g
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Selecting Compaction Selecting Compaction Standard and DeterminingStandard and DeterminingStandard and Determining Standard and Determining
MoistureMoisture--Density CurveDensity Curve
ASTM D558
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Optimum Moisture ContentOptimum Moisture Contentpp7.5
6 5
7.0
)
6.0
6.5
OM
C (%
5 0
5.5
5.00 25 50 75 100
RAP Content (%)
49
( )
R1-B1 R1-B2 R2-B1 R2-B2
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Maximum Dry DensityMaximum Dry Densityy yy y140
130
135
t3 )
120
125
MD
D (l
b/ft
110
115
120M
1100 25 50 75 100
RAP Content (%)
50
( )
R1-B1 R1-B2 R2-B1 R2-B2
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Compacting and CuringCompacting and CuringCompacting and CuringCompacting and Curing
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Conditioning in Vacuum Conditioning in Vacuum Saturation TestSaturation Test (ASTM C593)Saturation Test Saturation Test (ASTM C593)
• Specimens are conditioned for 30 minutes in a vacuum h b d 24 i (11 8 i) d h k dchamber evacuated to 24 in. Hg (11.8 psi) and then soaked
for 60 minutes in de-aired, de-ionized water• UCS is immediately measured with specimen in soaked statey p• Conditioning requires less than 2 hours
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44--hr Underwater Soakhr Underwater Soak44 hr Underwater Soakhr Underwater Soak
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Capping and 7Capping and 7--day Unconfined day Unconfined Compressive Strength TestingCompressive Strength TestingCompressive Strength TestingCompressive Strength Testing
Strain rate of 0.05 in./minute
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Materials Materials Engineering and Engineering and Pavement DesignPavement DesignPavement DesignPavement Design
• Specify cement stabilization only if p y ysoluble sulfate concentration is below 3000 ppm
• Specify cement content corresponding to 7-day UCS of between 400 and 500
fpsi after appropriate curing and conditioningU l ffi i ( ) f 0 16• Use a layer coefficient (a2) of 0.16 to 0.20 in structural pavement design or a corresponding moduluscorresponding modulus
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Pavement Pavement ContructionContruction
• Complete compaction before substantial p phydration occurs so that cementitious bonds are not broken during densification– Allowable compaction delay time depends upon
wind speed, air temperature, relative humidity Provide a moist curing period of between 4• Provide a moist-curing period of between 4 and 7 days
• Specify microcracking of the CTB layer if an• Specify microcracking of the CTB layer if an asphalt surface course will be placed
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Quality Control and QualityQuality Control and QualityQuality Control and Quality Quality Control and Quality AssuranceAssurance
• QC/QA on FDR projects can be difficult because the OMC and target dry densitybecause the OMC and target dry density depend upon RAP content, which can greatly vary across a projecty p j
• Profile milling can be utilized to improve uniformity of asphalt thickness prior to FDR so that RAP contents are more constant
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Quality Control and QualityQuality Control and QualityQuality Control and Quality Quality Control and Quality AssuranceAssurance
• In the field, nuclear density gauges have limited utility because relative density is notlimited utility because relative density is not correlated to relative strength for CTB materials
• Stiffness testing is recommended• UCS testing of field-mixed Proctor samples isUCS testing of field mixed Proctor samples is
recommended
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CONCLUSIONCONCLUSION• FDR in conjunction with cement stabilization
is an effective method for reconstructing failed flexible pavementsfailed flexible pavements
• Cement slurry can be utilized in urban, residential areas to eliminate fugitive dust problemsproblems
• Cement content should be determined through laboratory testingg y g
• Microcracking should be utilized to minimize development of reflection cracking in asphalt surface coursessurface courses
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THANK YOUTHANK YOU
W. Spencer Guthrie, Ph.D.D t t f Ci il d E i t lDepartment of Civil and Environmental
EngineeringBrigham Young UniversityBrigham Young University
801-422-3864guthrie@byu [email protected]