9 class advances in field compaction houston modified...
TRANSCRIPT
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Advances in Designing Field Compaction:M D RelationsM-D Relations
C. Vipulanandan (VIPU), Ph.D., P.E.p ( ), ,Professor of Civil Engineering
Director of CIGMATDirector of THC-IT
Department of Civil and EnvironmentalDepartment of Civil and Environmental Engineering
University of HoustonHouston, Texas 77204-4003
1994
I G M A TC
1994
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What Have We Done Since 1930?
• Use Laboratory Compaction Results (2 Energy)for Field Compaction. (No Field Standard?)
• Compactor Technology Has Advancedp gy(Multiple Energy). We have not changed?
• Monitoring Technology Has Advanced We areMonitoring Technology Has Advanced. We areonly measuring the density and moisturecontentcontent.
• No Correlation Between Field Compaction andLaboratory Compaction?Laboratory Compaction?
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Field Vs Lab CompactionField Vs. Lab Compaction
Field CompactionLab Compaction(Sample Size, Energy,(Sample Size, Energy,Mold)
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WHAT IS COMPACTION OF SOILS ?WHAT IS COMPACTION OF SOILS ?
COMPACTOR + SOIL COMPACTION+ =
What Advancements?
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Major Components in Field Compaction
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Compacted Soil Properties Depend on the Energy/Stress Path of Compaction
Strength?gPermeability?
DryWet
Same Soil (Dry & Wet) Compacted Differently
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What Have We Done ? Laboratory Correlations & Modeling..
Will This Help in The Field?
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How to Interpret the Compaction Curve?Soil is a 3 Phase Material: Solid Water and AirSoil is a 3 Phase Material: Solid, Water and Air
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OBJECTIVES• Field Versus Laboratory Compaction ?
• Computer Generated (CG) Curves
• Intelligent Compactor (IC)
• Design and Build New Devices (A Device for• Design and Build New Devices (A Device for Compacted Soil Characterization (SP-CIGMAT)).
• Verify the Performance of SP-CIGMAT in the Field .
1994
I G M A TC
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Field Test Site
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Field CompactionField Compaction
Before Compaction After Compaction
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Field Checks of Density
Nuclear density gauge18
y g g
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Quality Control ProcedureCalifornia Bearing Ratio (CBR) TestPushing Cap Drilling Rig Bar
Cutting EdgeCBR Mould
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Field Study: 10 Soils (CL, CH, SC)Field Study: 10 Soils (CL, CH, SC)
SELECTED CL SOIL
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Field Vs. Lab (CL): Curve Location & Shape
How to get the field curve (FC)?
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Compacted Soil Properties (CL): Field vs Lab (Moisture γ S e N )Field vs. Lab (Moisture, γd, Sr, e, Na)
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Computer Generated (CG) Curves
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Major Issues With Compaction….
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INTELLIGENT COMPACTIONINTELLIGENT COMPACTION(IC)(IC)
IS IT COMPACTORIS IT COMPACTOROR COMPACTION?OR COMPACTION?
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FHWA
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(1)(1)
(2)
1. Measures the Stiffness of subgrade. 3. QA/QC tool1. Measures the Stiffness of subgrade.
2. Stiffness Related to Plate Bearing test (Strength?)
3. QA/QC tool
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Year 2010
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SDOT StudiesSDOT Studies
Include Texas……
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COMPACTORS – Measurement Values (MV)(A t ti F db k C t l)(Automatic Feedback Control)
Ks & E – Stiffness of Soil CMV – Compaction Meter Value
What is the Soil Property?CCV – Continuous Compaction Value
What is the Soil Property?Dry Density, M/C, Modulus?
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What is Need for Field Compaction?p
1. What is the M/C for Compaction?1. What is the M/C for Compaction? (Lab or Field)
2. Will the IC give you the M/C? No
3. How Many Roller Passes?3. How Many Roller Passes?
(Intelligent Compaction?)
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S il Stiff (K )Soil Stiffness (Ks)
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Wh t Sh ld b th M i t C t t?What Should be the Moisture Content?
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Controls in a Compactorp
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CCC
GPS Accuracy0 4 to 0 8 inch0.4 to 0.8 inch
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NEW MONITORING DEVICES
1 Modulus1. Modulus
2. Strength
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Modulus ?
1. Initial, Tangent, Secant, Resilient, Cyclic?
2 What Test? Lab vs Field2. What Test? Lab vs. Field
3. Replace Dry Density?
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NEW PENETROMETER
SP- CIGMAT
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Pavement DesignPavement Design
Modulus of Resilient (Mr) = k (CBR)n
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CBR = m (Su)fCBR m (Su)
R ili t M d l M f(S )Resilient Modulus Mr = f(Su)
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Field Penetrometer: SP-CIGMAT
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Quality Control Procedure
SP-CIGMAT Penetrometer
Hole created after shelby tube sample
CIGMAT Penetrometer performing the test
Deflected Spring Aft T t
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shelby tube sample performing the test After Test
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Conclusions
(1)Field Compaction is not LaboratoryC iCompaction.
(2)Intelligent Compactor is being Used asQA/QC for Compaction (Soil Modulus?)
(3)New Advances in Compaction Technology( ) p gy(Computer Generated Curves) Can be Usedfor Design and Monitoringg g
(4) Others/SP-CIGMAT Can be Used DuringConstruction for Compacted SoilConstruction for Compacted SoilCharacterization (Strength, CBR).
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1994
I G M A TC
Thank You & Questions?
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