Advances in Designing Field Compaction: M D Relations M-D Relations C. Vipu lanandan (VIPU), Ph.D., P.E. Professor of Civil Engineering Director of CIGMAT Director of THC-IT Department of Civil and Environmental Department of Civil and Environmental Engineering University of Houston Houston, Texas 77204-4003 1994 I GM A T C 1994
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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
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?
Field Vs Lab CompactionField Vs. Lab Compaction
Field CompactionLab Compaction(Sample Size, Energy,(Sample Size, Energy,Mold)
WHAT IS COMPACTION OF SOILS ?WHAT IS COMPACTION OF SOILS ?
COMPACTOR + SOIL COMPACTION+ =
What Advancements?
Major Components in Field Compaction
Compacted Soil Properties Depend on the Energy/Stress Path of Compaction
Strength?gPermeability?
DryWet
Same Soil (Dry & Wet) Compacted Differently
What Have We Done ? Laboratory Correlations & Modeling..
Will This Help in The Field?
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
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
Field Test Site
Field CompactionField Compaction
Before Compaction After Compaction
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Field Checks of Density
Nuclear density gauge18
y g g
Quality Control ProcedureCalifornia Bearing Ratio (CBR) TestPushing Cap Drilling Rig Bar