Innovations in Recycled Asphalt Pavements North Dakota Asphalt Conference Bismarck, ND March 29,...
Transcript of Innovations in Recycled Asphalt Pavements North Dakota Asphalt Conference Bismarck, ND March 29,...
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2017 North Dakota Asphalt Conference
Bismarck, NDMarch 29, 2017
Donald Matthews, PE
Pavement Recycling Systems, Inc.
Innovations
in
Recycled Asphalt Pavements
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What We Know
Asphalt has always been recyclable.
# 2 in world after recycled water
Valuable Material in Hot Mix Asphalt
Provided Feasible and Cost Effective
When Nearby to HMA Plant
More Going Out Then Into the Facility
No Inventory Build Up
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Other Historical Low Value Reclaimed
Asphalt Pavement (RAP) Uses
Shoulder Backing
Trucking & Equipment Yards
Haul Roads
Dust Control
Crushed Miscellaneous Base
These Are Poor Uses for Such a Valuable Asset
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No Need to Squander Virgin Aggregate
RAP In Many Cases Out Performs Native Aggregates
Neutral Charge, Works Well With Binders
Cost Effective
Environmentally Smart
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Alternative Uses of RAP in Pavement Preservation
Recycled In-Place
HIR - Hot In-place Recycling (Not Discussed)
Cold In-place Recycling (CIR)
Cold Central Plant Recycling (CCPR)
As Aggregate
RAP Chip Seals
RAP Slurry Seals/Micro Surfacing
RAP Cape Seals
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Cold In-place Recycling (CIR)
Distressed Pavement = New Pavement Using
Train of Equipment that:
– Mills deteriorated pavement - Reclaimed asphalt pavement
(RAP)
– Crushes RAP to gradation
– Mixes with recycling agent
– Additive if needed
– Re-Paves recycled mix
– Compacts to specified density
– Readies for surface treatment
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CIR Crushing and Sizing Train
(Some Variations But Same Concept)
Full Lane MillRecycling Unit
Recycling Agent
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Pavement Milled
Main Mill
Self-propelled
Minimum 12.5 ft cutter
Automatic depth controls to maintain the depth
Control cross slope
Supplemental Mill
Put millings in front of main mill to pickup and process
Shoulders and misc. areas
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Cracking Pattern Disrupted
70% Rule for Mitigation of
Reflective Cracking
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May Add Additive
(Dry Cement)
Spread Just in
Front of Mill
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Quick Lime Slurry
Applied to Cutting Teeth
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Recycling Plant Meets All
Calibration Requirements
Crusher
Pug Mill
Screen Deck
New MixMass Flow
Meter
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Crushing and Sizing Equipment,
100% Closed Circuit System
Crushing and sizing equipment capable of reducing RAP to the 100% passing 1-inch to 1¼-inch sieve
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Mixed in Pugmill
Continuous pugmill equipped
with paddles to provide sufficient
mixing
Belt scale and integrated
microprocessor control
Automatic controls to obtain the
proper amount of binder
Weighing and measuring
devices calibrated
Emulsion or Foamed Asphalt Injection
System
Mass Flow Meter
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New Recycled Mix Windrowed
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Pick Up and Installation
Caltrans State Route 33
Recycled Asphalt
Surface
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Cold Central Plant Recycling (CCPR)
Stockpiled Clean RAP
= New Pavement
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1) Mill and Stockpile RAP
Onsite CCPR - Cold Milled from
Roadway and Recycled Back to Same
Roadway
Imported CCPR – RAP is Brought
from One Project and Recycled to
Another
Central Facility CCPR – RAP
Stockpiled from Various Projects for
Future Use
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Onsite CCPRSame Road - RAP Milled from Roadway to be Reconstructed
Prior to Milling
Cold Milled
Stockpiled Nearby
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Imported CCPR
RAP Imported from One Roadway and Processed and
Returned to Different Application
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Central Facility CCPRRAP Imported from Various Projects and Stockpiled for
Future Use
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2) RAP is Sized (Typically 1” to 11/4” Max)
Using a Scalping Screen on the Feed Hopper of Processing Plant
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100% RAP Crushed and ScreenedClosed Loop System
Screen
Crusher
Return
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RAP Fractionization
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3/8” New Agg.
1” x No. 4 RAP
No. 4 Minus RAP
3) Can Supplement with New Aggregate
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Recycling Agents
Emulsified Asphalt
Engineered Emulsions
Polymer Modified Emulsions
Solvent Based Emulsions (CMS2s)
Expanded Asphalt (Foam)
Recycling Additives (added in small quantities)
Cement Dry
Lime Slurry
4) Mix with Water and Recycling Agent Adding Recycling Additives if Necessary
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Combination Processing Plant
Crusher
Pug Mill
Screen Deck
Mass Flow Meter
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After Sizing Standard Pugmill
Asphalt for 3.3% Foamed
Asphalt
1.0% Cement Added
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5) Loaded into Trucks and Transported To Laydown Area
Swept and Tacked Prior to Paving
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6) Pave Recycled Mix
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7) CIR and CCPR -Compact to Specified Density
Pneumatic-tired roller at least 22 to 25 tons
Double drum vibratory steel-wheeled roller at least 10 tons
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Cold Recycle Surface
Before Sealing
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8) CIR and CCPR-Protect for Temporary Traffic
Apply fog-seal
Apply sand blotter
Release to traffic
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Typically 2 to 10 days
9) CIR and CCPR - Cure and Reroll if Necessary
Reroll (supplemental compaction) if required (typically for emulsified asphalt)
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Because of Higher Void Ratio Must
Be Sealed
Slurry or Micro Surfacing –
Low Volume Shoulders and Lots
Chip Seal – Low
Volume Highways
HMA Overlay – Higher Volume Highways
High Shear Areas
10) CIR and CCPR -Final Surfacing
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City Of Menifee Newport Road3” CCPR over 10” FDR Cement
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Auto Auction 1-Million Square Feet 100% CCPR Recycled Asphalt
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CIR Rural Areas –
Caltrans State Route 36
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CIR Urban Areas –
City of Beverly Hills
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Eucalyptus Avenue Moreno Valley, July 2009
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Project Profile; Moreno Valley, July 2009
“Energy and Cost Savings”
8,744 tons of asphalt removed and repaved.
840 fewer trucks used utilizing CIR, compared to a mill and fill operation.
1,649 fewer barrels of oil used.
79.6% fewer carbon emissions utilizing CIR compared to mill and fill operation.
Cost savings to the City $262,320.00.
Cut 30% off the project
schedule.
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RAP Aggregates
Single stones and conglomerations
Residual asphalt content will vary by sample
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RAP Chip Gradations
Sieve Size
Percent Passing1
Medium 3/8” Medium Fine 5/16”
1/2" (12.5 mm) 100
3/8" (9.5 mm) 85-100 100
No. 4 (4.75mm) 0-15 0-50
No. 8 (2.36 mm) 0-5 0-15
No. 16 (1.18 mm) - 0-5
No. 200 (75 um) 0-2 0-2
Residual Asphalt
Content2
3.5% Min.
(Based on dry
weight of
aggregate)
3.5% Min.
(Based on dry
weight of
aggregate)
1. On unextracted RAP 2. On extracted RAP
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RAP Chips
Appearance may be dusty
but the dust is actually
asphalt
No need to wash. Wet with
an emulsion and keep dry
for asphalt rubber
Bonding is excellent
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RAP 3/8” Terminal Blend Asphalt
Rubber Chip Seal
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RAP 5/16” PME Chip Seal
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RAP Chip Seal San Bernardino County
El Rivino Road 2006 5/16” Chips
Before
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RAP Chip Seal
2006
10 years later
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RAP Chip Scrub Seal Los Angeles
County 2009 Avenue J
Scrub Seal with Polymer
Modified Rejuvenating
Emulsion Broomed into
Cracks
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RAP Chip Seal 2015 After
Los Angeles County Cracks Sealed 6 years later
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RAP Aggregates - Type II Slurry
and Micro Surfacing
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RAP Slurry and Micro Surfacing
Aggregates
Very Few Conglomerations
Residual Asphalt Remains Consistent
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Type II RAP Slurry Aggregate
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RAP vs Conv. Agg. Differences
RAP Slurry Light on Fines for Type II
Coating of Asphalt Limits Crushed Fines
Need to Prevent Clumping
Limit Amount of Material Stockpiled
Rescreen if Necessary
Needs to Be Rubber Tire Rolled
3% Latex Modified Minimum
Adds Early Retention Until Asphalts Meld
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RAP Slurry Seal
RAP ISSA Type II
Component Amount Amount
Emulsion 10% - 14% 12% - 18%
Residual AC 12.5% Min. 7.5% - 13.5%
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Conventional Equipment Can Be Used
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RAP Slurry compared to Conventional, City of La Mirada,
California. Side by Side – One Year later, RAP is Blacker
RAP Slurry Conventional Slurry
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Methods of RAP Management
Require RAP Materials in Conventional Bids
Utilization of In-house RAP
On Site Method
Existing RAP Stockpile or New RAP StockpileDeveloped
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RAP Aggregate Central Production Facility
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5/16” Chips Made from RAP
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Recycle Your RAP on Site
Urban Quarry
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Caltrans On-Site Management
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RAP Chip and RAP Slurry (RAP Cape)
Aggregates Produced Simultaneously
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Some of the Best Aggregates Are in Our Roads
Increasingly Difficult to Open New Pits
Solution
Use Your
RAP!
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Questions?
Don Matthews, PE
Technical Services Manager
Pavement Recycling Systems, Inc.
10240 San Sevaine Way
Jurupa Valley, CA 91752
(951) 934-4753 (T)
www.pavementrecycling.com