Structural Evaluation of Cold Recycling Reclaimed Asphalt Pavement (RAP) Blends
GREEN TECHNOLOGY: OPTIMIZING PAVEMENT RECYCLING...
Transcript of GREEN TECHNOLOGY: OPTIMIZING PAVEMENT RECYCLING...
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GREEN TECHNOLOGY:
OPTIMIZING PAVEMENT
RECYCLING METHODS
IN
INGHAM COUNTY
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Why Recycle? Utilize Already Paid-For Materials
Existing Pavement Source of Quality Aggregates
Reduce Cost, Extend Project Budgets
Facilitate Improved Pavement Structure
Conserve Resources
Reduce Trucking Costs
Reduce Virgin Material Consumption
Reduce Energy Consumption
But Most Important…
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RECYCLING SAVES $$
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Most Common Pavement
Recycling Methods -
Cold Milling Hot Mix Asphalt (HMA) Pavements
HMA Base Crushing and Shaping
Hot-in-Place Recycling (1 – 2 inch partial depth)
Cold-in-Place Recycling (3 – 5 inch partial
depth)
Full Depth Reclamation (4 – 8 inch depth)
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Emerging Technology - Ground Tire (Crumb) Rubber Modified
HMA Pavements
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COLD MILLING
HMA
PAVEMENTS
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Cold Milling HMA Surface
Traditionally Contractor Property, RAP
utilized in Hot Mix Asphalt
No Compensation to
Owner
Material Value Lost
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Cold Milling HMA Surface
Repurposed Uses by Ingham County
Maintenance Stockpiles
Trucking Cost Not
Eligible for Federal
Participation
Trucking Costs Double
Trucking Currently
Scarce, Expensive
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Cold Milling HMA SurfaceRecycling HMA Surfaces Special Provision:
Repurposed RAP Used on the Project
Multiplies Cost Savings:
Eliminate Trucking Out RAP
Reduce/Eliminate Trucking Pit Aggregate In
Repurpose Material on Nearby Project(s)
Trucking Paid Separately (One Way Only)
Non-Participating Pay Item
Coordinate Projects for Efficiency
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HMA BASE CRUSHING
(AND SHAPING)
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HMA Base Crushing (and Shaping)
Same Recycling Principles as Cold
Milling
Recycling HMA Surfaces Special
Provision:
Separate Crushing from “Crushing and
Shaping” (Recycled Aggregate Production)
All HMA Removals Specified for Recycling
(HMA Surface, Rem, Special)
Stockpiling and Handling
Included with Modified or
Special Pay Items
Estimate Available Quantity
with Pavement Cores
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Recycled Aggregate Use
Aggregate Bases
(Especially Crush & Shape/Widening Projects)
Stabilized RAP/Aggregate Bases (CIPR, FDR)
Approach, Cl III
Shoulder, Cl III
Subgrade Undercutting
Embankment
Engineer Retains Authority to Restrict Use
of All Recycled Aggregates
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Recycled Aggregate Sources
Project Removals (Crushing/Cold Milling)
Imported from Off-Site Location(s)
Other County Project(s)
Processed/Crushed Material Supplier
Contractor Yard
Other Contractor Projects
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Recycled Aggregate Base (Imported)
Aggregate Base, Modified Special
Provision: 21AA Base Gradation (Imported Aggregate)
Tolerance Ranges Permit Acceptable
Variability
Testing at Engineer Discretion:
At Stockpile (Source) Location
On Project
Remediation Permitted
1/2 the Cost of Virgin (Pit) Aggregate
Quality Comparable (Better?) than Pit
Aggregate
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Recycled Aggregate Base
Aggregate Base, Modified Special
Provision:
Compensation Strategies Separate Pay Items for Different Depths (SYD)
(Within X-Section, e.g. Widening)
Amalgamated Depth Pay Item (SYD)
Weight (TON) – Requires Scale Tickets
Volume, LM (CYD)
Volume, CIP (CYD)??
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Recycled Aggregate Base
Aggregate Base, Modified Special
Provision:
Separate Pay Items for Different Depths Multiple Pay Items = Inspection Intensive
Aggregate Base Conditioning (No Grade Change)
Aggregate Base, Salv, __ inch (Widening, Cut, Fill)
Aggregate Base, RAP __ inch (for Stabilized Base)
Transition Points Subjective
Overrun Risk to Owner
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Recycled Aggregate Base
Aggregate Base, Modified Special
Provision:
Amalgamated (All Inclusive) Depth Pay Item Single Pay Item Regardless of Depth Variation,
Either Across X-Section OR Throughout Alignment
Aggregate Base, Modified, _ inch
Pay Limits Per Typical Section = Reduced Inspection
Contractor Assumes Risk for Available vs
Imported Material
Include Pavement Cores in Contract Docs
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= COST SAVINGS
New Construction
With
Recycled Aggregates
Produced from
Cold Milling HMA Surface
HMA Base Crushing
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ICRD Recent Project Savings
2015 Lake Lansing Road,
Meridian Twp: 1.0 mi, Widen 2 to 3 Lanes, Crush & Shape
Quantity for Widening Will Be Imported
Aggregate Base, Modified, 9 inch $ 3.78/SYD
MDOT Statewide AUP (22A) $ 7.29
48% Savings
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ICRD Recent Project Savings
2014 Intersection Safety
Projects
College @ Kipp and Williams @
Decamp
Vertical and Horizontal Intersection ReAlignment
Recycled Aggregate Removed and Replaced on
New Alignments
Aggregate Base, Salv, 7 inch $ 3.28/SYD
Std Spec (21AA) Aggregate Base, 7 inch $ 6.44
49% Savings
Minimal to No Imported Aggregate
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ICRD Recent Projects
2014 Intersection Safety
College Rd @ Kipp Rd
Before
After
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ICRD Recent Projects
2014 Intersection Safety
Williams Rd @ DeCamp Rd
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ICRD Recent Project Savings
2013 Zimmer Road,
Williamstown Twp 4 mi Widen for Paved Shldr, Crush &
Shape;
Aggregate Base, Salv, 7 inch $ 3.12/SYD
Std Spec Aggregate Base, 7 inch $ 6.64
53% Savings
Aggregate Base, Salv, 5 inch $ 2.50/SYD
Std Spec Aggregate Base, 5 inch $ 4.69
47% Savings
High Quality Recycled Material Imported from State Complex
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ICRD Recent Projects
2013 Zimmer Rd
Zimmer Rd @ M-43 Grand River Ave
Before
After
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ICRD Recent Projects
2013 Zimmer Rd
Zimmer Rd
Before
After
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ICRD Recent Project Savings
2013 Cornell Road, Meridian
Twp 2 mi, 2 Lane Crush & Shape,
Over 5,000 CYD RAP Imported from Nearby
Marsh Rd Mill/Fill Project (1/2 mi Long Stockpile!)
Aggregate Base, RAP, LM $ 8.77/CYD
Trucking $ 2.50/SYD (From Marsh Rd)
Total In-Place Cost $ 1.56/SYD
Placed 5” LM (±4” CIP)
Crumb Rubber Modified HMA
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ICRD Recent Projects
2013 Cornell Rd, Meridian Twp
Before
After
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ICRD Recent Project Savings
2012 Raby Road, Meridian Twp ±0.8 mi, 2 Lane Unpaved Local Rd
Numerous Resident Dust and Pothole Complaints
2,500 CYD RAP Imported from Nearby
Haslett Rd CIPR Project
Graded, Compacted by ICRC Maintenance Crew
Placed ±8” LM (±6.5” CIP)
Trucking $ 3.00/CYD (From Haslett Rd)
In-Place Material Cost $ 0.67/SYD
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ICRD Recent Project
2012 Raby Road, Meridian Twp
No More Resident Complaints!
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HOT IN PLACE RECYCLING
(HIPR)
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Hot In-Place Recycling (HIPR) HIPR is an On-Site, In-Place Rehabilitation of
Existing Pavement Consisting of:
Heating (Softening)
Rejuvinating (Binder)
Mixing
Placing
Compacting
Typically 1 to 2 inches in Depth
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Hot in Place Recycling (HIPR)
Primary Heater
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Hot in Place Recycling (HIPR)
Secondary Heater
Rejuvinating
Oil Distributor
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Hot in Place Recycling (HIPR)
Screed
Tines & Auger
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Hot in Place Recycling (HIPR) Immediate Open to
Traffic (1-2 Weeks Max)
Finished HIPR Surface
Requires Surface
Course
HMA Overlay
Chip Seal
$4-6/SYD (Quantity Dependent) Compacted HIPR Surface
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Hot in Place Recycling (HIPR)
Scred
HMA Overlay
Curb RevealICRD 2014 Local Road Program
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Hot in Place Recycling (HIPR) Advantages:
Single Pass Operation
Lowering/Adjusting Castings Not Required
Immediate Open to Traffic
Disadvantages:
Limited Depth
Crown Correction Not Possible
Reflective Cracking Eventual
Not Suitable with Overband/Hot Poured Joint Sealers
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ICRD Recent Project Savings
2014 Shoeman Rd, Meridian
Twp 2.4 mi Cold Milling, HIPR, and Intersection Grade
Raise w/ HMA Base Crushing
2,000 CYD RAP Generated from Cold Milling
Aggregate Base, Salv, 7 inch $ 4.50/CYD
Aggregate Base, 21AA, 7 inch $ 10.00/CYD
31,000 SYD HIPR @ $ 4.24/SYD
Maintained Traffic for 8 weeks (NOT Recommended!)
Surplus RAP Hauled to Unpaved Local Road
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ICRD Recent Projects
2014 Shoeman Rd
HIPR Surface
Texture
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ICRD Recent Projects
2014 Shoeman Rd
RAP Surfaced Local Road
Grade
Raise
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COLD IN PLACE RECYCLING
(CIPR)
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What is Cold-in-Place
Recycling (CIPR)?
In-Place Resurfacing Using Existing Materials with No Heat
Partial Depth Cold Milling, Bituminous Stabilization Processing, and Repaving in a Single Pass
Removes Distress at Depths Up to 5 inches
Requires Wearing Course
HMA – Higher Volume Roads
Chip, Cape Seal or Micro Surfacing - Lower Volume Roadways
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Cold-in-Place Recycling
(CIPR) Distresses that can be treated with CIR
Thermal Cracking
Fatigue and Edge Cracking
Reflective Cracking
Rutting
Raveling
Poor Ride Quality
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Cold-in-Place Recycling
(CIPR) Process
Cold Mill 3 – 5 inches Deep
Inject Binder/Stabilizing Agent
Mix All Components
Re-Pave with Treated Recycled Mixture
Compact and Cure Recycled Mixture
Apply Wearing Course
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Cold-in-Place Recycling
(CIPR)- Types of Stabilization Agents Bituminous Stabilization:
Conventional Emulsion
Engineered Emulsion
Foamed Hot AC
Chemical Stabilization (Pozzolanic), e.g.
Cement (Usually an Additive)
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Cold-in-Place Recycling
(CIPR)
- Types of Stabilization Agents
Conventional Asphalt Emulsions
Mechanical Break
Graded for Seal Coat Specifications
Temperature and Moisture (Weather) Sensitive
Longer Cure Time / Delay Open To Traffic
Cost Effective
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Cold-in-Place Recycling (CIPR)
- Types of Stabilization
Agents Engineered Emulsion
Higher Asphalt Content
DurabilityFlexible
Climate-Specific Binder
Formulated for Each Project
Faster Cure (vs Conventional Emulsions)
Better Dispersion with Higher Film
Thickness
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Cold-in-Place Recycling (CIPR)
- Types of Stabilization
Agents Foamed Asphalt (Expanded Asphalt)
Water (± 2% by Weight) Injected into PG Grade Hot AC (350° F)
Water Evaporates Abruptly; Causes Explosive
Foaming in the Asphalt Stream
Asphalt Expands 15 To 20 Times Original
Volume
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Wirtgen Asphalt Foaming
System
To Other
Nozzles
Expansion Chamber
Hot Asphalt
Cleaning Plunger
AirFoaming
Water
Foamed Asphalt
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Cold-in-Place Recycling (CIPR)
- Types of Stabilization
AgentsFoamed Asphalt (Expanded Asphalt)
Steam Surface tension
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Cold-in-Place Recycling
(CIPR) Process Repaving Treated Material
Conventional Asphalt Paver (Preferred)
Screed w/Electronic Grade & Slope
Controls
Elevator Loads Paver Hopper
Maintain Constant Material Depth
30 Ft Averaging Ski for Smooth Ride
Keep Paver Close to Mixing Unit
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Cold-in-Place Recycling
(CIPR) Process Repaving Treated Material
Some Equipment Has Integral Paving
Screed
Material Handling Capability Limited
Not Suitable for Crown Correction or
Widening Pavement
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Cold-in-Place Recycling (CIPR)
Equipment Types of CIR Trains
Single Unit Train
Two Unit Train
Multi Unit Train
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Cold-in-Place Recycling (CIPR)
Equipment Single Unit Train (Preferred)
“Down-Cut” Mill Controls Gradation
Mill Cuts Existing Pavement to Proper Depth and Slope with Electronic Controls
Spray Bar in Cutting Chamber Injects Binder, Water, Additives into Mix with Computer Controlled System
Treated Material Windrowed Between Processing Unit Tracks
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Cold-in-Place Recycling (CIPR)
EquipmentProcessing Operation
Single Unit Train
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Cold-in-Place Recycling (CIPR)
EquipmentDown Cut Milling Head
Asphalt Or
Emulsion Spray Bar
Computerized
Proportioning
System
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Cold-in-Place Recycling (CIPR)
EquipmentHMA PAVER
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Cold-in-Place Recycling (CIPR)
EquipmentProcessing Operation
Two Unit Train
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Cold-in-Place Recycling (CIPR)
EquipmentProcessing Operation
Multi-Unit Train
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Cold-in-Place Recycling (CIPR)
EquipmentCompaction
CIPR Mixes are Stiffer, Placed in Thicker Lifts;
Heavier Rollers Required for Compaction
Compaction Follows Emulsion Break (Color
Change)
Water System Prevents Mix from Sticking to Rollers
95% - 102% Density as Determined by Growth
Curve
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Cold-in-Place Recycling (CIPR)
EquipmentRollers
Breakdown Roller
Finish Roller
Intermediate Roller
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Cold-in-Place Recycling (CIPR)
Equipment
Behind Paver
After Compaction
1 Week of Traffic
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Cold in Place Recycling (CIPR) Advantages:
Single Pass Operation
Short Cure for Open to Traffic
Minor Crown Corrections Possible
Works Well in Curb Sections
Disadvantages:
Lowering/Adjusting Castings Required
Partial Depth (Reflective Cracking Eventual)
Mat Tender During Cure Time
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Ingham County Project
2012 Haslett Road, Meridian
Township 2.25 mi 4 Lane Urban C&G Road Resurfacing; 5
inch CIPR Depth, 2 inch 4E HMA Wearing Course
55,000 SYD CIPR @ $8.00/SYD
Profile Milling Along C&G;
2,500 CYD RAP Exported to Raby Rd
Crumb Rubber Modified HMA
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Ingham County Project
2012 Haslett Road, Meridian
Township
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Ingham County Project
2012 Haslett Road,
Meridian Township
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Ingham County Project
2012 Haslett Road, Meridian
Township
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Ingham County Project
2012 Haslett Road, Meridian
Township2015
2012
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FULL DEPTH RECLAMATION
(FDR)
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What is Full Depth
Reclamation (FDR) Crushed (& Shaped) HMA Base
Blend Aggregate Base with Pulverized HMA
75 – 80% RAP to Aggregate Ratio Preferred
Add Aggregate to Improve Structure Number (SN)
Regrade Base
Base Stabilization (4 to 8 inches) Improves Aggregate SN:
Bituminous Stabilization
Chemical Stabilization
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Types of (FDR) Stabilization
(Binders) Bituminous Base Stabilization:
Engineered or Conventional Emulsion
Hot Liquid AC
Foamed Hot AC
Chemical Stabilization (Pozzolanic)
Cement
Lime
Type C Fly Ash
Kiln Dust
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Full Depth Reclamation (FDR)
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Full Depth Reclamation
(FDR) Equipment/Processing Variations:
Single Pass Equipment (Same as CIPR)
Paver Placed
Multiple Pass Equipment
Single or Multi-Drum Stabilizer
Stabilized in Place
Graded and Compacted
Requires Wearing Course (HMA, Chip Seal)
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Single Pass FDR Process Same Equipment as CIPR
No Grading
Separate Paver Can Be Used
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Multi-Pass FDR
Equipment
Single Drum Unit
(PreCrushing Optional)
Multi-Drum Unit
(Requires PreCrushing)
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Multi-Pass, Multi Drum FDR
Process
PreCrushing
Grading/Balancing
This Method Provides More
Uniform Stabilization Depth
Where Crown Correction is Required
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Multi-Pass FDR
Equipment/Process
Spray Bar – Multi Drum
Compaction
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Multi-Pass FDR Process
Grading Stabilized Base
Completed Grade
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Completed FDR
Stabilized Base
Overla
y
Texture
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Full Depth Reclamation (FDR) Pavement Deficiency/Distress Corrected
with FDR
Frequent Deep Transverse and/or Lateral Cracking
Heavy Map/D Cracking
Reflective Cracking
Heavily Patched/Potholed
Severe Rutting or Shoving
Parabolic Crown
Insufficient base strength
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Suitable FDR Candidates
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Full Depth Reclamation (FDR) FDR Advantages
Cost Effective Compared to Reconstruction $5-7/SYD Depending on Depth, AC Content
Reduced Trucking
Reduced Construction Time (Short Cure)
Allows for Cross Section/Crown Corrections
Added Pavement Structure
Add RAP or Aggregate
Stabilized Base 2.5 x SN Untreated Aggregate
Minimal Grade Raise
Reflective Cracking eliminated
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Full Depth Reclamation (FDR)
FDR Disadvantages
Must Lower Structures, Survey Monuments
Traffic Disruption > CIPR (Aggregate Surface)
Minimal Grade Raise
Moisture Sensitive
Must Correct Drainage Problems
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Not a Good Candidate
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ICRD Recent Projects
2009 Williamston Rd,
Williamstown Twp
3” HMA, 13A Surface over
6” Engineered Emulsion Stabilized FDR
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ICRD Recent Projects
2010 Mt. Hope Rd, Meridian
Twp
300 lb/syd HMA LVSP, 6.5” AC FDR
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GROUND TIRE
(CRUMB) RUBBER MODIFIED
HMA PAVEMENTS
IN INGHAM COUNTY
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Crumb Rubber (CR) Modified
HMA
- Proven Technologies in
U.S.A.
Terminal Blend – CR & Polymer Blend Mixed at
Asphalt Terminal
Wet Process – CR Mixed at HMA Plant with Specialized
Equipment
Dry Process – CR Blended with RAP Stockpile at HMA
Plant
NOTE: CR Granules Soften, But Do Not Melt in AC
Binder or HMA Mixture
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CRUMB RUBBER (CR) MODIFIED HMA
- EMERGING TECHNOLOGIES Pre-Swollen – CR Pretreated/Soaked in Liquid Asphalt
Absorbs AC and Expands; Blended with HMA Mixture
with RAP Stockpile
Devulcanized – Emerging Technology to Process CR
into Liquid Introduced to AC at HMA Plant, Akin to
Liquid Polymer (Rubber Melts)
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MDEQ SCRAP TIRE MARKET
DEVELOPMENT PROGRAM
GRANT Up to $500,000 Per Year
ICRD Partners with Michigan State University
to Research/Develop CR Modified Mixtures
Suitable for Michigan Climate
YEAR PROJECT TYPE GRANT AMOUNT
2011 WAVERLY RD TERMINAL BLEND 287,400.00$
2012 HASLETT RD WET PROCESS 151,100.00$
2013 CORNELL RD TB/DRY HYBRID 192,000.00$
2014 BENNETT RD TB/HIGH RAP 178,200.00$
2014 KINAWA RD TB/HIGH RAP 189,900.00$
2014 HAGADORN RD TB/HIGH RAP 38,500.00$
2015 LAKE LANSING RD PRE-SWOLLEN 300,000.00$
2016 ?OKEMOS/JOLLY RDS DEVULCANIZED 300,000.00$
Total MDEQ Grant Funding 1,637,100.00$
CRUMB RUBBER MODIFIED HMA PROJECTS IN INGHAM COUNTY
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2013 Cornell Road
Meridian Twp
CR MIX / CONTROL MIX
HYBRID DRY/TERMINAL BLEND
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2014 Bennett Road, Meridian
Twp 1.5 mi 2 Lane w/ Paved Shoulders; Full
Depth Cold Milling, Aggregate Base
Conditioning, Intersection Widening, and
Repaving
2,700 CYD RAP Delivered to 2 Locations
High RAP Content Crumb Rubber Modified
HMA
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2014 Bennett Road
Meridian Twp
Control Mix / CR Mix
CR Mix / Control Mix
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2014 Kinawa Road, Meridian
Twp 1.05 mi 3 Lane Curb & Gutter;
21,000 SYD Cold Milling
1,500 CYD RAP Delivered to Unpaved Local Road
22,000 SYD HIPR @ $ 4.02/SYD
+1,100 CYD Subgrade Undercutting, Type I (RAP
Backfill)
High RAP Content Crumb Rubber Modified HMA
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2014 Kinawa Road
Meridian Twp
CR Mix / Control Mix
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SUMMARY
Ingham County Has Realized Significant
Cost Savings and Extended Project
Budgets with the Successful, Aggressive
Use of Multiple Recycling Methods,
Combined and Coordinated among
Multiple Concurrent Projects
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Acknowledgements
Jim Schwarz – JZS Consulting LLC
Tim Flanagan – Flanagan Sales & Assoc., Inc
Asphalt Recycling and Reclaiming Association
(ARRA) www.ARRA.org
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OPTIMIZING PAVEMENT
RECYCLING METHODS IN INGHAM
COUNTY
QUESTIONS?