High RAP Asphalt Mixes and Asphalt Mixes with Shingles...2 5 4 RAP Stockpiling and Management...
Transcript of High RAP Asphalt Mixes and Asphalt Mixes with Shingles...2 5 4 RAP Stockpiling and Management...
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High RAP Asphalt Mixesand
Asphalt Mixes with ShinglesPennsylvania Asphalt Pavement Association
56th Annual ConferenceHershey, PA
January 27, 2016
Mansour SolaimanianPenn State University
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RAP Stockpiling and Management4
Outline
Brief Review of Shingles in Asphalt Mixes
3 Proposed Changes for Design of RAP Mixes
2 General Info. on RAP Characterization
1 Introduction to RAP Usage in Asphalt
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RAP Stockpiling and Management4
Outline
Brief Review of Shingles in Asphalt Mixes
3 Proposed Changes for Design of RAP Mixes
2 General Info. on RAP Characterization
1 Introduction to RAP Usage in Asphalt
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RAP USAGE Approximately 71.9 million tons of RAP placed in pavements in 2014.
(Source: NAPA)
#1 Recycling Product in USA
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Environmental/Economical Benefits
Landfill Saving: 50 Million Cubic Yards each Year
Cost Savings: $2.8 Billion
Source of Information: NAPA
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56.162.1
66.7 68.3 67.871.9
0
10
20
30
40
50
60
70
80R
AP
Usa
ge in
HM
A/W
MA
, Mill
ion
Tons
Year2009 2010 2011 2012 2013 2014
RAP Usage in HMA/WMANumbers are in Million Tons
Source of Information: NAPA
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RAP Usage in HMA/WMAPennsylvania Data
Data: Courtesy of PennDOT
0.8
1.11.1
0.9
0.6
1.11.2
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
RA
P U
sage
in H
MA
/WM
A
(Mill
ion
Tons
)
2009 2010 2011 2012 2013 2014 2015
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HMA/WMA with RAPPennsylvania Data
Data: Courtesy of PennDOT
5.6
7.46.9
5.8
4.2
6.3
7.3
0.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
HM
A/W
MA
with
RA
P, M
illio
n To
ns
2009 2010 2011 2012 2013 2014 2015
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HMA/WMA with RAPPennsylvania Data
Data: Courtesy of PennDOT
71.5
83.6 80.988.6 88.9 86.5
92.1
0
10
20
30
40
50
60
70
80
90
100
HM
A/W
MA
with
RA
P (P
erce
nt o
f Tot
al)
2009 2010 2011 2012 2013 2014 2015
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RAP Stockpiling and Management4
Outline
Brief Review of Shingles in Asphalt Mixes
3 Proposed Changes for Design of RAP Mixes
2 General Info. on RAP Characterization
1 Introduction to RAP Usage in Asphalt
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Questions Is there full binder blending? How to find RAP aggregate gradation? How to find RAP binder content? Do we need to grade RAP binder and how? What is the best way to stockpile RAP? Do we need to fractionate RAP into sizes? How is application temperature affected by
RAP usage? What percent of RAP to use in the mix?
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Aggregate Gradation vs. Black Rock Gradation
Black Rock
Extracted Aggregate
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RAP Binder Content
13
Using Solvent Extraction
As received
Scalped (Finer Portion)
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0.00.51.01.52.02.53.03.54.04.55.05.56.06.5
Burn-off 1, RAP as Received
Burn-off 2, RAP as Received
Burn-off 3, RAP after Scalped
Burn-off 4, RAP after Scalped
Burn-off 5, RAP after Scalped
Burn-off 6, RAP after Scalped
% B
ind
er C
onte
nt
Burn-Offs
% Binder Content from Burn-Offs (After Cf)
RAP Binder Content from Burn-off
Using Ignition Oven
As received
Scalped (Finer Portion)
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Process for RAP Binder Characterization
Common practice for determination of RAP binder properties?
Binder ExtractionBinder RecoveryBinder AgingRheological Testing to Grade
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RAP Stockpiling and Management4
Outline
Brief Review of Shingles in Asphalt Mixes
3 Proposed Changes for Design of RAP Mixes
2 General Info. on RAP Characterization
1 Introduction to RAP Usage in Asphalt
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Main Source of Information for Changes
NCHRP Report 752, 2013, Transportation Research Board, National Research Council, Business Office, 500 Fifth Street N.W., Washington D.C. 20001.
This publication is also available on the Internet at
http://onlinepubs.trb.org/onlinepubs/nchrp/nchrp_rpt_752.pdf
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Affected PennDOT Publicationsregarding Changes in
RAP/RAS Usage
Bulletin 27 (Mix Design)
Section 409 of Spec 408 (Construction Spec.)
Publication 2 (POM)
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RAP Mix Design
Design Covered in Bulletin 27
Details in Chapter H of Bulletin 27
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RAP Mixes in PA
Current Protocols Tier 1 (Low RAP): Less than 15% RAP in Mix Tier 2 (High RAP): More than 15% RAP in Mix
Notes: The above are based on RAP content in the mix. Move is taking place to consider RAP binder
content rather than the RAP content in the mix.
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New Definitions for RAP Usage
New Term: Reclaimed Asphalt Binder Ratio: RBR
Definition: RBR is defined as the amount of RAP and RAS
asphalt binder in the mixture divided by the total asphalt binder in the mixture.
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Example Calculation for RBRRAP content in total mix: 20%RAP binder content: 4.8%
RAS content in total mix: 5%RAS binder content: 21.5%
Mix total binder content: 6.6%
Determine RBR:
RAP binder content in the mix= 0.2 X 4.8 = 0.96%
RAS binder content in the mix= 0.05 X 21.5 = 1.08%
RBR = 2.04/6.6 = 0.31
Total binder contribution from RAP and RAS0.96%+1.08% = 2.04%
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Proposed Mix Design Tiers
Mix Design
Tier
Pavement Course(s) RBR
IWearing and Binder ≤ 0.20
Base ≤ 0.25
IIWearing and Binder > 0.20 and < 0.25
Base > 0.25 and < 0.30
IIIWearing and Binder ≥ 0.25
Base ≥ 0.30
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How Does the Change ImpactExisting Mix Designs?
3429
994
1930 1926
567
0
500
1000
1500
2000
2500
3000
3500
4000
Num
ber
of M
ix D
esig
n
Old System
New System
Tier 1 Tier 2 Tier 3
Total of 4423 Mixes
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Concern about RAP Aggregate Gsb
How Do We Find RAP Aggregate Sp. Gr. (Gsb)?
Two Ways Are Proposed: 1. Do solvent extraction and run AASHTO T84
and T 85 2. Backcalculate Gsb using RAP Aggregate
Effective Sp. Gr. and Binder Absorption
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Concern about RAP Aggregate Binder Absorption
How Do We Find RAP Aggregate Binder Absorption?
Two Ways Are Proposed: Assume absorption based on historical data Use Lab Work
1. Find Gsb of ignition oven extracted aggregate using T84 and T85.2. Blend aggregate from ignition oven with binder and find Gse3. Use results from steps 1 and 2 to find Gsb.
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Work under Proposed New Tiers
Tier 1 Sampling Gradation of RAP Aggregate Asphalt Content
• Ignition or Solvent Extraction
RAP Aggregate Sp. Gr. • Several Options Exist
• Sp. Gr. on aggregate from solvent extraction• Using Gmm, Gse, and binder absorption
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Tier 2 Sampling – Split Samples needed from Stockpile Gradation of RAP Aggregate Consensus Properties of RAP Aggregate Asphalt Content
• Only through Solvent Extraction
RAP Aggregate Sp. Gr.
Work under Proposed New Tiers
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Tier 3 Sampling – Three Split Samples needed
• One Set for Testing in an Independent Laboratory.• One Set for Mix Design• One Set for LTS
Gradation of RAP Aggregate Continuous Binder Grade by Independent Lab Consensus Properties of RAP Aggregate Asphalt Content
• Only through Solvent Extraction
RAP Aggregate Sp. Gr.
Work under Proposed New Tiers
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Tier 3 Determine Required Binder Grade Performance Testing (Hamburg Wheel Tracking)
Design ESALs (million) Maximum HamburgRut Depth, (mm)
< 3 ---3 to <10 1010 to <30 8
≥ 30 6
Work under Proposed New Tiers
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RAP Stockpiling and Management4
Outline
Brief Review of Shingles in Asphalt Mixes
3 Proposed Changes for Design of RAP Mixes
2 General Info. on RAP Characterization
1 Introduction to RAP Usage in Asphalt
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QUESTIONS?
Do We Need to Categorize/Classify RAP Stockpiles
Do We Need to Tie Field Usage and RAP Content to RAP Categories?
Do We Need to Have Limits on the RAP Content Depending on the Pavement Layers/Traffic?
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Example of RAP Stockpile Classification(Iowa DOT)
Classified RAP Certified RAP Unclassified RAP
Requirements- Documented source- Stockpiled Separately- Meets Quality Control
Requirements- Undocumented Source- Poor Stockpiling- Meets Quality Control
Requirements- Undocumented Source- Unknown/Poor Aggregate- Poor Stockpiling- No Quality Control
Allowable Usage- 15% weight in surface- Min. 70% virgin AC- No limit in other layers
Allowable Usage- 10% surface ≤ 300K ESAL- 20% Interm. ≤ 1M ESAL- 20% Base for all ESAL
Allowable Usage- 0% surface for all ESAL- 10% Interm. ≤ 1M ESAL- 10% Base for all ESAL
Source: Section 2303. Hot Mix Asphalt Mixtures. Iowa DOT Standard Specifications
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Example of RAP Stockpile Classification(Illinois DOT)
FractionatedRAP (FRAP)
HomogenousRAP
ConglomerateRAP
Non-Quality
Requirements- May represent more
than one aggregate type or quality
- At least C quality- Min. two size
fractions- 100% pass 1.5, 3/4, or
1/2 inches
Requirements- Same aggregate- At least C quality- Similar gradation/AC
Requirements- May represent more
than one aggregatetype or quality
- Unknown/PoorAggregate
- RAP stockpiles that do not meet the requirementsof the stockpile categories
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RAP/RAS Maximum Asphalt Binder Replacement (ABR) Percentage
(Illinois DOT)HMA
Mixtures RAP/RAS Maximum ABR %
Ndesign Binder/Leveling Surface Polymer
Modified30 30 30 10
50 25 15 10
70 15 10 10
90 10 10 10
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FRAP/RAS Max. Asphalt Binder Replacement (ABR) Percentage
(Illinois DOT)
HMA Mixtures FRAP/RAS Maximum ABR %
Ndesign Binder/LevelingBinder Surface Polymer
Modified
30 50 40 10
50 40 35 10
70 40 30 10
90 40 30 10
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RAP in Construction
Specs covered in Section 409
Minimum QC requirements covered in the Project Office Manual (Pub 2)
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Attention to RAP Quality
Reference Publications: Publication 23, Maintenance Manual. Publication 2, Project Office Manual.
Distinguish between Clean RAP: Free of subbase, dirt, soil, … Contaminated RAP: mixed with subbase, soil, …
NECEPT
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Where to Use Clean RAP
Where to Use Clean RAP: Exclusively for paving roadways or shoulders Don’t use for shoulder back-up and fill activities
Where to Use Contaminated RAP: Shoulder back up and/or stabilization
NECEPT
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Change from %RAP to %RBR
Current: Special Consideration when 15% < RAP Usage < 35%
Proposed: Special Consideration when RBR >0.20 for Wearing/Binder or RBR > 0.25 for Base Mixes
Follow Minimum QC Requirements for RAP Stockpiles: Incoming RAP (Raw RAP) Processed RAP
NECEPT
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for Processed RAP Level Pad (Follow Section 106.05 of Spec 408). Max. Agg. Size of RAP ≤ NMAS Sample every 1,000 tons during processing for asphalt content
and gradation Sample every 3,000 tons for Gmm, Gse, and Gsb
If RBR≥ 0.25, then use PTM 702 for asphalt content Ok. to use PTM 757 if correlation factor is established. Determine average and std. dev. of 10 samples Baseline std. dev. shall meet Spec 409 Table B-1
NECEPT
RAP Stockpile Preparation
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Yes if
Take Samples every 1,000 tons
Determine A New Standard Deviation
Ensure the New Standard Deviation meets specification limits
NECEPT
Could We Add Mat’l to Stockpile?
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What Size of Stockpile? And Should It Be Covered?
Ensure proper drainage of stockpile. Place in shelter with open ends. Use conical stockpile to naturally drain water. Avoid heavy equipment on the top of RAP
stockpile. Limit the height to 20 feet to reduce potential for
self-consolidation.
NECEPT
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Should We Fractionate RAP? Recommended for High RAP Mixes
Pros• Flexibility in meeting Mix Design requirements• Better control of gradation and less variability• Isolate the RAP with high fine content
Cons• Increases the cost• Requires more space• Increases the number of bins needed
NECEPT
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Should We Combine RAP from Multiple Sources?
If large quantity from one project available, better to use a designated stockpile, i.e. single source stockpile Less crushing needed, and possibly less cost Some projects only allow RAP from the same road
If combining multiple sources• Ensure consistency and uniformity
NECEPT
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How Much RAP Crushing is Ok?
Crushing generates fines, and should be minimized.
More crushing also generates more uncoated surface
Use screening to remove large particles from millings before crushing.
NECEPT
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Variability in RAP Stockpiles and Establishing Acceptable
Tolerances
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Looking at RAP Variability
Data from Several Studies Considered: 1. PennDOT Data of Six Stockpiles (PennDOT) 2. TTI Study of 2009 (Zhou et al., 2010) 3. FHWA Report of 1984 (NCHRP 752) 4. NCAT Study of Georgia Mixes (NCHRP 752) 5. ICAR Study of Florida (NCHRP 752) 6. Texas High RAP Study (Solaimanian et al., 1995) 7. Use of RAP in Airfield HMA Pavements (2008,
UNR, Pratheepan, Hajj) 8. Mix Design Manual (NCHRP 673 by AAT)
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0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
1 2 3 4 5 6
Std.
Dev
.
Study Number
Asphalt Content
Min.Max.
Variability in Asphalt Content
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0.0
0.5
1.0
1.5
2.0
2.5
1 2 3 4 5 6
Std.
Dev
.
Study Number
Pass #200 Sieve
Min.Max.
Variability in Mat’l Passing #200
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0.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
1 2 3 4 5 6
Std.
Dev
.
Study Number
Pass #8 Sieve
Min.Max.
Variability in Mat’l Passing #8
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Guidance from NCHRP 673Mix Design Manual
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Guidance from NCHRP 673Mix Design Manual
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Guidance from NCHRP 673Mix Design Manual
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Guidance from NCHRP 673Mix Design Manual
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Data from Two More Sources
0.00
0.05
0.10
0.15
0.20
0.25
0.30
0.35
0.40
0.45
Std.
Dev
.
Asphalt Content
Fine
Single RAP Stockpile
Coarse
Multiple RAP Stockpile
Data Source #8:Mix Design Tool
FractionatedStockpiles
Data Source #7:Mix Design Tool
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Data from Two More Sources
0.00
0.50
1.00
1.50
2.00
2.50
3.00
Std.
Dev
.
Passing #200 Sieve
Fine
Single RAP Stockpile
Coarse
Multiple RAP Stockpile
FractionatedStockpiles
Data Source #7Data Source #8:Mix Design Tool
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Data from Two More Sources
0.00
1.00
2.00
3.00
4.00
5.00
6.00
Std.
Dev
.
Passing #8 Sieve
Fine
Single RAP Stockpile
Coarse
Multiple RAP Stockpile
FractionatedStockpiles
Data Source #7Data Source #8:Mix Design Tool
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Proposed Table for Standard Deviation ofRAP Asphalt Content and RAP Gradation
Mixture NMAS RBR
Max. Std. Dev. for Asphalt Content
Max. Std. Dev. for Percent
Passing No. 200 Sieve
Max. Std. Dev. for Percent
Passing All Other Sieves
≤ 19 mmRBR ≤ 0.20 0.6 2.5 5.0RBR > 0.20 and < 0.25 0.5 2.0 4.0
RBR ≥ 0.25 0.4 1.5 3.0
≥ 25 mmRBR ≤ 0.25 0.6 2.5 5.0RBR > 0.25 and < 0.30 0.5 2.0 4.0
RBR ≥ 0.30 0.4 1.5 3.0
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5
RAP Stockpiling and Management4
Outline
Brief Review of Shingles in Asphalt Mixes
3 Proposed Changes for Design of RAP Mixes
2 General Info. on RAP Characterization
1 Introduction to RAP Usage in Asphalt
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Availability of Recycled Asphalt Shingles (RAS)
Over 10 million tons of RAS annually Almost 90% Post-Consumer Tear Off (RAS-TO) Waste from Production (RAS-MW)
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RAS Usage Approximately 2 million tons of RAS placed in Pavements in 2014.
(Source: NAPA)
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0.70
1.11.19
1.86
1.65
1.94
0.00
0.50
1.00
1.50
2.00
2.50R
AS
Usa
ge in
HM
A/W
MA
, Mill
ion
Tons
Year2009 2010 2011 2012 2013 2014
Numbers are in Million Tons
RAS Usage in HMA/WMA
Source of Information: NAPA
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Shingle Composition
Base material (fiberglass reinforcing mat or organic felt)
Surface granules (ceramic)(UV, fire Protection, Color)
Asphalt coatingwith mineral stabilizers (lime dust, 70% passing #200 sieve)
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Shingle CompositionOrganic Based Shingles
Asphalt: 30%
Felt: 14%Filler: 19%
Granules: 37%
• Heavier• More Expensive• Higher Wind Resistance
• Asphalt: 30-36%• Felt: 2-15%• Mineral Filler: 8-40%• Mineral Granules: 20-38%
An Example of Composition
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Shingle CompositionFiberglass Based Shingles
• Lighter• Cheaper
• Asphalt: 18-22%• Felt: 2-15%• Mineral Filler: 8-40%• Mineral Granules: 20-38%
An Example of Composition
Asphalt: 20%
Felt: 12%
Filler: 32%
Granules: 36%
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Stockpiling of Processed/Shredded RAS
Remove all deleterious material including nails Process and grind shingles before use
• AASHTO PP 078: grind to 3/8 inch
Blend with fine virgin aggregate at 50-50 blend• Minimizes agglomeration
Avoid direct sunlight and store under roof• Minimizes agglomeration
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Ground Shingles
Coarse
Fine
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How Much of the Mix is RAS?
RAS binder content: 18% Target RBR from RAS: 0.17 Target binder content of the mixture: 6.5% RAS binder needed to deliver target RBR from RAS: 0.17 X 6.5 = 1.11%
of the mixture Amount of RAS needed as a percent of the mix: 1.11/18 X 100 = 6.2% So at 50:50 blend, the RAS-fine aggregate blend will be 12.4% of the
weight of the mixture (i.e. 2 X 6.2=12.4).
EXAMPLE
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Process for RAS Binder Characterization
What is best practice for determination of RAS binder properties?
Binder ExtractionBinder RecoveryRheological Testing to Grade
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Binder Recovered from RAS Too Stiff to Pour
375°F
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Binder Recovered from RASRight after RTFO aging: binder not covering the entire bottle
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Blend before Recovery of Binder
Extract RAS Binder: Alternative 1: Blend with virgin mix before
extraction. Alternative 2: Blend with virgin binder after
extraction Use a Soft Binder Such as PG 52 or 58 Blend at Different Proportions of RAS Binder
Recover the blended Binder
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Limits on RAS Content in the Mix
RBR Contribution from RAS
≤ 0.20 for wearing/binder courses ≤ 0.25 for base course
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Resources for RAS in Asphalt
AASHTO MP023-15:Standard Specification for Reclaimed Asphalt Shingles for Use in Asphalt Mixtures
AASHTO PP078-14:Standard Practice for Design Considerations When Using Reclaimed Asphalt Shingles (RAS) in Asphalt Mixtures
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NAPA IS-136Guidelines for the Use of Reclaimed Asphalt Shingles in Asphalt Pavements (October 2009)
Resources for RAS in Asphalt
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Acknowledgments
The research that resulted in the work presented here was sponsored and funded by Pennsylvania Department of Transportation. This support is greatly appreciated.
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Disclaimer
The contents of this report reflect the views of the author(s) whois (are) responsible for the facts and the accuracy of the datapresented herein. The contents do not necessarily reflect theofficial views or policies of the [Insert Name of Federal AgencyProviding Funding] or the Commonwealth of Pennsylvania at the time of publication. This report does not constitute a standard,specification or regulation."
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Thank You!