Download - Fundamentals of Intelligent Compaction
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FHWA Intelligent Compaction National Workshop
May 3, 2012 Minneapolis, MN
Session No. 3 Fundamentals of
Intelligent Compaction
By George Chang Transtec Group
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Outlines
• IC Definition • IC Roller Systems • Correlation Tests • GPS • IC Data Maps
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Intelligent Compaction
Continuous Measurement System
Global Positioning
System (GPS)
Onboard Report System
Courtesy of Bomag
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Single Drum IC Rollers
Bomag
Caterpillar Ammann-Case
Dynapac Sakai
HAMM-Wirtgen
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Retrofit Single Drum IC Roller Volvo with Trimble Retrofit
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Double Drum IC Rollers Bomag
Caterpillar Sakai
HAMM-Wirtgen
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Retrofit Double Drum IC Roller Conventional Roller with Trimble Retrofit
Printer
Control Box GNSS Receiver
Temperature Sensor
Temperature Sensor
Courtesy of Trimble
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Caterpillar Soils IC System GPS
Receiver Radio
Slope Sensor Accelerometer
Controllers
Display
Courtesy of Caterpillar
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Sakai Double Drum IC System
Temperature Sensor
GPS Radio/Receiver
Control Panel
Accelerometer CIS Display
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HAMM Double Drum IC System
Accelerometer
GPS Receiver
HCQ GPS Navigator
Temperature Sensors Control Panel
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Caterpillar CMV, MDP
Dynapac CMV
Bomag EVIB
Sakai CCV
Ammann kb
Roller Measurement Values
HAMM/Wirtgen HMV
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Compaction Meter Value CMV
modified from Thurner and Sandström 1980
Ω
Ω⋅=AA
C CMV 2
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Compaction Control Value CCV
Courtesy of Sakai
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Roller Integrated Stiffness Kb
zd
csks
mf
ksuspcsusp
fe(t)
zf
Equivalent frame weight
Suspension stiffnessand damping
Drum weightand dynamicforce generated
Soil stiffnessand damping
md
Fs
Courtesy of Ammann
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Vibration Modulus Evib
Courtesy of Bomag
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De-Coupled - Layer Moduli
Courtesy of Bomag
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Machine Drive Power MDP
)MDP(37.1150MDP80 −=
)MDP(75.2150MDP40 −=
Scaled Values
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Ammann Auto-Feedback
Courtesy of Ammann
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Bomag Auto-Feedback
Courtesy of Bomag
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Correlation with In-Situ Testing
Courtesy of David White
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In-Situ Tests for Soils/Subbase LWD
FWD
DCP NDG
PLT DSPA BCD
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Soils Density vs. Modulus
Courtesy of Prof. Briaud
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In-Situ Tests for HMA NG
PSPA
NNG
LWD-a
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100 % Coverage
1 / 1,000,000
Courtesy of Trimble/Caterpillar
Sampling Coverage
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ICMV vs LWD Sakai CCV
LWD
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GPS Measurements
GPS location: 37o 23.323’ N
122o 02.162’ W
Space Segment
Control Segment
User Segment Courtesy of Trimble
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GPS Precisions • Autonomous:10 -15m • DGPS: 0.5 - 5m • Float : 1 m • Fixed :1-3 cm
Courtesy of Trimble
Not to scale
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GPS Accuracy for IC
Unspecified Source
1 2 3 4
IC Pass
Counts
Poor GPS Good GPS
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GPS Planning - DOP
Courtesy of Trimble
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GPS Plane Projection
• From Curved Earth Surface to Flat Maps
Longitude Latitudes
Easting Northing Elevation
Courtesy of Franson/CoordTrans
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US UTM Zones
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State Plane Coordinate System
Courtesy of PennState U.
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RTK GPS
Connected by Radio Link
GPS Base Station GPS Rover
Roller GPS Radio/Receiver
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Virtual Base Station System
OmniSTAR HP Subscription
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GPS Onsite Verification
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GPS Rovers for Point Tests
TopCon OmniSTAR Trimble
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Point Tests and IC Data
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Caterpillar Soils IC System
Courtesy of Caterpillar
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HAMM Asphalt HCQ System
Courtesy of HAMM/Wirtgen