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

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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

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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

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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.

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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

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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

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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

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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.

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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%

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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

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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

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RAP Processing

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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.

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Fine Fractionated RAP Fine Fractionated RAP StockpileStockpile

2525

Coarse Fractionated RAP Coarse Fractionated RAP ProductProduct

3/8”minus RAP

2626

2727

2828

2929

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THANK YOU

3131

QuestionsQuestionsPascal Mascarenhas

Vulcan Materialsmascarenhasp@vmcmail.com

626-856-6190 Phone626-969-2918 Fax626-705-6611 Cell