11
HIGH RAP % IN HMAHIGH RAP % IN HMACALAPA SPRING CONFERENCE
ONTARIO
APRIL 10, 2014
22
33
WHAT IS RASWHAT IS RAS
Recycled Asphalt ShinglesRecycled Asphalt Shingles About a dozen manufacturers About a dozen manufacturers Four out of five homes are covered Four out of five homes are covered
with asphalt shingles.with asphalt shingles. 111 million squares of shingles111 million squares of shingles 123 million tons123 million tons
44
COMPOSTION OF ROOFING COMPOSTION OF ROOFING SHINGLESSHINGLES
30% TO 40% ASPHALT CEMENT. Harder (About 25 Pen 30% TO 40% ASPHALT CEMENT. Harder (About 25 Pen
@77F) than paving asphalt @77F) than paving asphalt
40% to 60% hard rock granules (minus #10) and filler 40% to 60% hard rock granules (minus #10) and filler
(minus 0.15mm)(minus 0.15mm)
1% to 12% fiber (0.5 to 4.5mm long fiberglass or cellulose) 1% to 12% fiber (0.5 to 4.5mm long fiberglass or cellulose)
felt or miscellaneous materials.felt or miscellaneous materials.
SOURCES OF RASSOURCES OF RAS
From Tearoffs – Post consumerFrom Tearoffs – Post consumer From manufacturing waste/seconds – From manufacturing waste/seconds –
typically 5% to 10% of production - typically 5% to 10% of production - PreconsumerPreconsumer
55
66
WHY RECYCLE?WHY RECYCLE? Landfill shortage. If RAS not Landfill shortage. If RAS not
recycled it will end up in landfills - recycled it will end up in landfills - 95% of all roofing waste.95% of all roofing waste.
In 1992 disposal costs ranged from In 1992 disposal costs ranged from $30 to $55/ton$30 to $55/ton
Beneficial UseBeneficial Use Excellent performanceExcellent performance
77
USE OF RASUSE OF RAS
AASHTO MP15-12 Use of Reclaimed AASHTO MP15-12 Use of Reclaimed Asphalt Shingles as an Additive in Asphalt Shingles as an Additive in HMAHMA
AASHTO PP-53 2012 – Design AASHTO PP-53 2012 – Design Considerations When Using RAS in Considerations When Using RAS in New HMA New HMA
Researchers are still trying to come Researchers are still trying to come up with a simple mix design method.up with a simple mix design method.
88
Design ConsiderationsDesign Considerations
Determining Shingles Aggregate Determining Shingles Aggregate Gradation and Specific GravityGradation and Specific Gravity
Estimating the Contribution of the Estimating the Contribution of the RAS asphalt binder to the Final RAS asphalt binder to the Final Blended Binder in New HMA.Blended Binder in New HMA.
PG and Percentage of the Virgin PG and Percentage of the Virgin Asphalt Binder in New HMAAsphalt Binder in New HMA
99
MIX DESIGN PROCESSMIX DESIGN PROCESS
Representative Samples of RAS.Representative Samples of RAS. ASTM D 2172 or AASHTO T308 .ASTM D 2172 or AASHTO T308 . RAS used is minus 8 MeshRAS used is minus 8 Mesh Either Abson Recovery (ASTM D1856) Either Abson Recovery (ASTM D1856)
or Rotary Evaporator (ASTM D 5404)or Rotary Evaporator (ASTM D 5404) PG grading of Tearoff RAS - +PG 150PG grading of Tearoff RAS - +PG 150 Blend to PG 64 -10 with blending Blend to PG 64 -10 with blending
chartscharts
1010
Vulcan Los Angeles Regional LabVulcan Los Angeles Regional Lab
Viscosity Testing
Extraction/Recovery
Recovery of RAS BinderRecovery of RAS Binder
1111
1212
Typical RAS MaterialTypical RAS Material
1313
RAS Test DataRAS Test Data
1414
Recycling Agents (ASTM D4552)
RA1 RA5 RA25 RA75 RA250 RA500
Viscosity @ 60C (cSt) 50-175176-900901-
45004501-12500
12501-37500
37501-60,000
Flash Point, C, Minimum
218 218 218 218 218 218
Saturates, %, Minimum
30 30 30 30 30 30
Viscosity Ratio (RTFO or TFO)
3 3 3 3 3 3
1616
Mix Design ProceduresMix Design Procedures
Asphalt Content, Aggregate Asphalt Content, Aggregate Gradation and PG or RAPGradation and PG or RAP
Gradation of New AggregateGradation of New Aggregate Combined Gradation of Recycled MixCombined Gradation of Recycled Mix Either Hveem, Marshall or Superpave Either Hveem, Marshall or Superpave Binder Replacement specBinder Replacement spec
Binder ReplacementBinder Replacement
Binder Replacement +( (A x B)/C ) x Binder Replacement +( (A x B)/C ) x 100100
A = RAS percent binder contentA = RAS percent binder content B = RAS percent in mixtureB = RAS percent in mixture C = Total percent binder content in C = Total percent binder content in
mixture.mixture.
1717
Binder Replacement Binder Replacement ExampleExample
A = RAS AC% = 30.0A = RAS AC% = 30.0 B = RAS % in mixture = 4.3B = RAS % in mixture = 4.3 C = Total percent binder in mixture C = Total percent binder in mixture
= 5.2= 5.2
Binder Replacement = 24.8%Binder Replacement = 24.8%
1818
1919
Caltrans Superpave SpecsCaltrans Superpave Specs
For HMA with Binder Replacement For HMA with Binder Replacement less than or equal to 25% of OBC you less than or equal to 25% of OBC you may REQUEST step down PG bindermay REQUEST step down PG binder
For HMA with a binder replacement For HMA with a binder replacement greater than 25% but less than 40% greater than 25% but less than 40% of OBC you MUST USE step down PG of OBC you MUST USE step down PG binderbinder
No provisions for Rejuvenating No provisions for Rejuvenating AgentsAgents
2020
Caltrans Superpave SpecsCaltrans Superpave Specs
For HMA with RAP the maximum For HMA with RAP the maximum binder replacement must be:binder replacement must be:– 25.0% percent of OBC for surface 25.0% percent of OBC for surface
coursecourse– 40.o% percent of OBC for lower courses40.o% percent of OBC for lower courses
2121
RAP Processing
2222
RAP Processing
RAP FractionationRAP Fractionation
For RAP substitution of 15% or less, For RAP substitution of 15% or less, fractionation is not required.fractionation is not required.
For RAP substitution greater than 15% For RAP substitution greater than 15% Fractionate RAP stockpiles into 2 sizes:Fractionate RAP stockpiles into 2 sizes:– Coarse RAP – Retained on 3/8” screen – Coarse RAP – Retained on 3/8” screen –
100% Passing the 1” screen100% Passing the 1” screen– Fine RAP – Passing 3/8” screen (98 -100%)Fine RAP – Passing 3/8” screen (98 -100%)– You may use the Coarse fraction, fine You may use the Coarse fraction, fine
fraction or combo of both.fraction or combo of both.
2323
2424
Fine Fractionated RAP Fine Fractionated RAP StockpileStockpile
2525
Coarse Fractionated RAP Coarse Fractionated RAP ProductProduct
3/8”minus RAP
2626
2727
2828
2929
3030
THANK YOU
3131
QuestionsQuestionsPascal Mascarenhas
Vulcan [email protected]
626-856-6190 Phone626-969-2918 Fax626-705-6611 Cell