micro milling - amazon web services · micro milling in conjunction with pavement preservation 1....
TRANSCRIPT
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MICRO MILLING Applications and Advantages for Pavement
Preservation
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Presentation Overview
1. Difference between standard milling, fine milling and
micro milling
2. Factors that dictate surface texture
3. Applications and advantages of micro milling
4. Job stories
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Drum Categories:
• Standard Milling- 5/8” (15mm) Spacing
• Fine Milling-3/10” (8mm) Spacing
• Micro Milling-2/10” (5mm) Spacing
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Surface Comparison
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Determining Factors of Surface
Texture/Surface Pattern
1. Bit Spacing
2. Forward Cutting Speed
3. Wrap Configuration
4. RPM
5. Diameter of the Drum
6. Drum Maintenance
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1. BIT SPACING
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Standard Milling Drum
• “Triple Wrap” at 5/8” (15mm) Spacing
Triple Wrap Lacing at 5/8” (15mm)
Spacing – 150 Bits
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Fine Milling Drum
Triple Wrap Lacing at 5/16” (8mm)
Spacing - 300 Bits
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Micro Mill Drum
Triple Wrap Lacing at 2/10” (5mm)
Spacing - 450 Bits
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2. FORWARD CUTTING
SPEED
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5/8”(15mm) Standard Drum Bit Strikes
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Forward Cutting Speed
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Forward Cutting Speed
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3. WRAP DESIGN
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Triple Wrap vs. Quad Wrap
5/8” -15mm Spacing (150 Bits) 15/16”- 22.5mm spacing (200
Bits)
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Wrap Design and Micro Milling
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Spacing Can Be Misleading
12mm-.45” vs. 8mm-.3” Triple Wrap
Same Forward Cutting Speed and RPM
Tighter Spacing Does NOT = Smoother Surface
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2. Forward Cutting Speed
8 mm Triple Wrap Fine Drum (300 Bits) Vs. 22.5mm-15/16” Quad Wrap Standard Drum (200 Bits)
Both Milled at 85’/Minute
Increased Bit Count Does NOT = Smoother Surface
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Remaining Factors
4. RPMs- Equally important as speed but
is far less volatile
5. Diameter of the drum-Usually set by
machine manufacturer
6. Cutter drum maintenance
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2. Forward Cutting Speed
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Specifications
Equipment Specs
DO NOT insure end result
Performance Specs
INSURES end result
Allows room for competitiveness and creativity
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Performance Based Specs for Micro
Milling
• Georgia- Laser Road Profilograph
-Remove/Replace OGFC
-Multiple Lifts Required Before Micro Milling Spec
-Laser Measures the Distance of the Peak/Valley
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Performance Based Specs for Fine Milling
• Virginia- Fine Milling Sand Test
-Smoothness for Safety Reasons
-Disconnect of Milling and Paving Operations
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Micro Milling Applications
• Ride Corrective Tool Before Preservation Treatment
• Surface Preparation Tool Before Preservation Treatment
• Surface/ Friction Course Removal
• Correctional Work
• Faulted Concrete Correction
• Wheel Rut Removal
• Temporary Driving Surface
• Bridge Deck Repair
• In-field Crushing of Material
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Micro Milling Advantages
• Improved Ride on Overlays/Surface Treatments
• Enhances Pavement Life Cycle
• Reduction in Material Cost
• Reduction in Construction Cost
• Safer Driving Surface
• Restores Curb Line
• Reduction in RAP Processing Costs
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Micro Milling in Conjunction with
Pavement Preservation
1. Improve Ride/Smoothness of Road
2. Provides a Better Bonding Surface
- Removal of Old Surface
- Removal of Paint, Oil Slicks
- Reduction in the Size of Surface Cracks
3. Restores Curb Line
4. Less Material Required (vs. standard milling)
-Shallower Grooves .1” vs. .5”
-Improved Spread Rate
5. PUBLIC PERCEPTION
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• Rough Road- 7.3 Magnitude Earthquake
• 22.5 Miles- 11,747 Must Grinds Identified
• Low Volume Road
• Structurally Sound Base
• Minor Number of Structural Repairs Needed
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:
1. Thin Lift Overlay/Surface Treatment
-Too Rough
2. Mill and Fill
-Too Costly
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Micro Milling-
-Improve ride
Asphalt Rubber Seal Coat-
-Seal Surface
-Provide a New Wearing Course
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RT. 111: BEFORE
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1st Phase: Micro Mill Process
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2nd Phase: Asphalt Rubber Seal Coat
Application
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Aggregate Spreading Process
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Compacting
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AFTER: RT 111
• 61.4% PRI Improvement
• 3.73” per 1/10 of Mile
• Estimated life extension of 10+ Years
• ¼ Price of Mill and Fill*
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Escondido Canyon, L.A. County
• Improved Ride
• Applied to a Clean and Prepped Surface
• Restored Curb Line
Micro Milling Before Cape Seal Surface
Treatment
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Summary….
Provides Options! Ride Improvement Tool
Cost Savings! Reduction in Material and Construction
Costs
Better Quality Product! Better Bonding of Surface Treatment
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Questions?
Andrea Latham
Keystone Engineering
317.319.7639
317.271.6192
www.keystonecutter.com