Transcript Recycled Asphalt Pavement In Preservation Doug Ford Pavement Coatings Co. Sriracha All Agencies Need Revenue Not in My Backyard Lets Talk Recycling Reclaimed Asphalt Pavement (RAP) Utilizing the Value 

Recycled Asphalt Pavement
In Preservation
Doug Ford
Pavement Coatings Co.
Sriracha
All Agencies Need Revenue
Not in My Backyard
Lets Talk Recycling
Reclaimed Asphalt Pavement (RAP)
Utilizing the Value
 Asphalt has always been
Recyclable
 Valuable material in Hot
Mix Asphalt
 Used when and where
feasible
 How do we expand to better
utilize this value
RAP Utilization
 Products
 Chip Seal
 Slurry Seal & Micro Surfacing
 Processing
 Unique Example
 Deep Recycling
 Cold In-Place Recycling (CIR)
 Cold Central Plant Recycling (CCPR)
Products
Typical Uses
 RAP Base
 Shoulder Backing
 Trucking yards
 Dust Control
 Crushed Miscellaneous Base
Good products but they don’t
use the most valuable asphalt
Products
Chip Seals
RAP Chip Gradation
TABLE 200-1.2.1 (A)
Percent Passing1
Sieve Size
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. Determined by CT362, CT379 or CT382.
RAP Chip Material
Residual Asphalt
Chips
Single stones and conglomerations
Residual asphalt content will vary by sample
Laboratory Tests on Chip
 Los Angeles Abrasion
(ASTM C 131)
Cleanness
Spec
 5% Loss -100 Revolutions
 23% Loss – 500 Revolutions
Sieve Analysis:
Value: 58 (Cal 227)
is 75 minimum
But not an issue
1
2
3
Ave.
Extracted
3
100
37
5
3
3
2
100
42
8
5
5
2
100
38
7
4
3
2
100
39
7
4
4
2
100
51
18
14
12
6
(ASTM C136 & C117)
3/8”
No. 4
No. 8
No. 16
No. 30
No. 200
Asphalt Cont. (%):
3.9
3/8” Chips
Appearance is dirty but
the dust is actually
asphalt dust. Bonding
capability is outstanding.
RAP Chip Seal
Early Projects
El Rivino Rd
San Bernardino County
2006
November 2014
RAP Chip Seal
Los Angeles County
Avenue J 2009
Scrub seal with
rejuvenating
emulsion
Extensive block
cracking and
alligator cracking
RAP Chip Seal
Los Angeles County
Hand applied
additional chip
to low areas
Rain fell that night
RAP Chip Seal
Los Angeles County
Avenue J 7/18/14
Great Retention
Best Practices
RAP Chip Seal
 What is a clean chip seal
 Dust is not dust, it’s
asphalt
 Gradation problems will
affect ability to bond
 With emulsions chips
should be moist
 Rejuvenators are very
good but should not be
overapplied
 Double chips seal
 One layer should not be
RAP
RAP Slurry Seal and Micro Surfacing
Type II RAP Slurry Aggregate
RAP Slurry Gradation
RAP Slurry Dust
Sieve Size
Percent Passing UNextracted
Percent Passing Extracted
ISSA Specification
3/8"
100
100
100
No. 4
95-100
95-100
90-100
No. 8
65-85
70-90
65-90
No. 16
35-60
50-75
45-70
No. 30
18-38
35-55
30-50
No. 50
8-25
22-40
18-30
No. 100
5-20
13-38
10-21
No. 200
2-12
10-20
5-15
Residual AC
6.5% Min.
Rap Slurry Gradations
Gradation Curves
100
Unextracted
90
Percent Passing
80
Extracted
70
60
50
ISSA Type II
40
30
20
10
0
100.000
10.000
1.000
0.100
Grain Size (mm)
0.010
0.001
RAP Slurry Material
Consistent Residual Asphalt through Segregation
Slurry Dust
Very few conglomerations
Residual asphalt remains consistent
RAP Slurry Seal Laboratory Test Results
RAP Slurry Seal
Component
Amount
ISSA Type II
Amount
Emulsion
10% - 14%
12% - 18%
Residual AC
12.5% Min.
7.5% - 13.5%
Minimum
12.5% Residual @
10% Emulsion
Minimum
7.5% Residual @
12% Emulsion
Field Test Applications
Calibration: as with any slurry
or micro, calibration is
essential!
 RAP is lighter than
virgin aggregate.
 Because RAP
emulsion percentage
is low, gate may need
to be modified.
 Insure material will
run through gate
without clumping.
Field Test Applications
 July 2003, Descanso
Gardens, La Canada, CA.
 13.5% CQS-1h
2005
Subject to excessive water
Field Test Applications
 August 2003,
Rodeo Access
Rd, Devore,
CA
 Varied
percentages
and additives
RAP Slurry Through 2014



















City of Agoura Hills
City of Barstow
City of Delano
Caltrans District 8 Maintenance
Caltrans District 11 Maintenance
City of Costa Mesa
City of Corona
City of Garden Grove
City of Hesperia
City of Irvine
City of Oxnard
City of Palmdale
City of Port Hueneme
City of Santa Clarita
City of Sierra Madre
City of Westlake Village
County of Los Angeles
County of San Bernardino – Special Districts
County of Ventura
RAP Slurry & Micro Surfacing
Southern California
Testing Started in
2003
Why RAP
 100% Recycled
 Better Color
Retention
 Cost Effective
 Zero Loss in
Performance
Six Months after Rain & Snow
Conventional Equipment Super Results
From 2003 to 2014
Best Practices

Slurry Seal


RAP Fines must be fresh.
Material that has been stored or
stockpiled too long should be rescreened
Stock Pile Management






Do not stock pile too much
material
Use material as it is delivered
(load out from all sides)
Do not load trucks the night
before
Minimum requirement of 3%
latex polymer
Rubber tire roller, minimum
three passes
High traffic areas can not be
over asphalted
Finished Environmentally Friendly Product
How to Utilize RAP
 Screening Process
 Utilization of In House RAP
Existing RAP Stock Pile
or New RAP Stock Pile
Being Developed
RAP Aggregate Products Prodced





Rap Chips (5/16” and 3/8”)
Rap Type II Slurry Dust
Crushed Miscellaneous Base
AC Base
RAP Base

Mixing Aggregates for CCPR
Stockpile Management
5/16” Chips Made from RAP
All chips must be screened twice!
RAP Slurry/Micro Dust
Screening process for
slurry and chips requires
segregation.

50%-60% Slurry

40%-50% Chips
Balancing the end product
can be challenging
Best Practices
 Clean RAP for Slurry
 Contaminated material should be segregated for use
on other products
 Sand Equivalent (SE)
 Utilization of multiple products at one time
 Chips and slurry dust – Slurry and AC Base
 Minimum of two screenings for chips.
 Moisture content
 Wet for chips on Emulsion Binders
 Dry for chips on Hot Asphalt Binders
 RAP Slurry Seal can not sit more than two to four
weeks without being re-screened.
Caltrans On-Site Management
Caltrans District 8 Maintenance

In house crews




Chip Seal
Crack Seal
Shoulder Backing
Contract Work

Slurry Seal
Utilized four RAP piles separated by
over 150 miles from each other.
This process allowed Caltrans to
make multiple products from
their own material.
The trucking cost can exceed $38
per ton to some locations.
Superior products used for two
years with little to no additional
cost.
RAP Chip and RAP Slurry (RAP Cape)
Aggregates Produced Simultaneously
Caltrans District 8 Maintenance
Application of RAP Chip
Seal using stockpiled
material owned by
the state
Cold In-place Recycling (CIR)
Distressed Pavement = New Pavement Using
A Train of Equipment that:
 Mills old pavement into Reclaimed Asphalt
Pavement (RAP)






Crushes RAP to gradation
Mixes with recycling agent
Re-Paves recycled mix
Compacts to specified density
Readies for surface treatment
Small carbon footprint
Starting Roadway
Cold In-Place Recycling (CIR)
Location
Location
Location
The Train
The Train
Emulsion
Recycler
Mill
Water Truck
Paving and Compaction
Roller Sequence and
Compaction
Cold Central Plant Recycling (CCPR)
From RAP
Clean Rap = New Pavement:



Stockpiled and kept clean
Crushed RAP to gradation
Mixed with engineered emulsion





In a central plant
Transported to lay down area
Paved as a recycled mix
Compacted to specified density
Readied for surface treatment
to Pavement
“Urban Quarries”
Recycle Sustainable Assets on Site!
Loading Reclaimed Asphalt
Pavement (RAP)
New Recycled Asphalt
Truck bring in Old Millings and Haul Back
New Recycled Asphalt
Installation with a Track Paving Machine
Closing Statement
One of the key elements of the County's sustainable program is
maximizing the opportunity to reutilize Reclaimed Asphalt Pavement
(RAP) in our pavement preservation Treatments. For the last three years
we have committed to using RAP in all our pavement preservation
treatments. Aside from the environmental benefits gained by using the
RAP material in these treatments we are very pleased with their
performance as well.
Greg Kelley, Deputy Director of Transportation, County of Los
Angeles
Questions
Thank You
Doug Ford