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Pascal Mascarenhas - RAP and RAS
Pascal Mascarenhas - RAP and RAS
Pascal Mascarenhas - RAP and RAS
Pascal Mascarenhas - RAP and RAS
Pascal Mascarenhas - RAP and RAS
Pascal Mascarenhas - RAP and RAS
Pascal Mascarenhas - RAP and RAS
Pascal Mascarenhas - RAP and RAS
Pascal Mascarenhas - RAP and RAS
Pascal Mascarenhas - RAP and RAS
Pascal Mascarenhas - RAP and RAS
Pascal Mascarenhas - RAP and RAS
Pascal Mascarenhas - RAP and RAS
Pascal Mascarenhas - RAP and RAS
Pascal Mascarenhas - RAP and RAS
Pascal Mascarenhas - RAP and RAS
Pascal Mascarenhas - RAP and RAS
Pascal Mascarenhas - RAP and RAS
Pascal Mascarenhas - RAP and RAS
Pascal Mascarenhas - RAP and RAS
Pascal Mascarenhas - RAP and RAS
Pascal Mascarenhas - RAP and RAS
Pascal Mascarenhas - RAP and RAS
Pascal Mascarenhas - RAP and RAS
Pascal Mascarenhas - RAP and RAS
Pascal Mascarenhas - RAP and RAS
Pascal Mascarenhas - RAP and RAS
Pascal Mascarenhas - RAP and RAS
Pascal Mascarenhas - RAP and RAS
Pascal Mascarenhas - RAP and RAS
Pascal Mascarenhas - RAP and RAS
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Pascal Mascarenhas - RAP and RAS

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Presentation delivered at the CalAPA Spring Asphalt Pavement Conference April 9-10, 2014 in Ontario. Topic: The use of Reclaimed Asphalt Pavement and Recycled Asphalt Shinges is explored in-depth.

Presentation delivered at the CalAPA Spring Asphalt Pavement Conference April 9-10, 2014 in Ontario. Topic: The use of Reclaimed Asphalt Pavement and Recycled Asphalt Shinges is explored in-depth.

Published in: Engineering, Business, Technology
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  • The tusks were built in 1952 to commemorate the visit of Queen Elizabeth. Oscar Pistorious the South African athlete shot his girlfriend on Valentine’s day. I don’t understand why the trial is taking so long. He doesn’t have a leg to stand on. Actually he may not have legs but he was fully armed.
  • One square of shingles covers 100 square feet.
  • Typically the asphalt cement that is used for shingles is an air blown product that is blown to about 200 F Softening Point and a relatively high pen
  • Technology in shingles production has improved tremenendously. 30 years is not uncommon. Longevity depends on the environment. They last longer in cooler climates.
  • There was a concern with asbestos fibers as 40 years ago shingles were commonly made with asbestos.
  • There really isn’t one way of designing mixes with RAS/RAP.
  • Typically shingles are loaded with fines. You will see in a later slide what the gradation is like. It is considered that not all the asphalt in RAS is effective. A portion of it is considered black rock.
  • The extraction of RAS takes a long time sometimes as long as 3 days because of the harder nature of the RAS binder. The finer RAS material is better for mixing with HMA. Our first experience with RAS was a minus ½” ground shingle. We used 5% of this RAS along with a WMA additivie in a mix that we used to pave our haul road. Everything went well except when you looked at the mat from one direction you could see some fibers sticking. You could say that it gave us a warm and fuzzy feeling.
  • We have a fairly well equipped binder lab
  • Recovery of the RAS binder also does not follow typical protocol. Even 0.5% solvent left in the residue will give you erroneous readings. Again because of the viscous nature of the RAS binder we have to up the temperature of the bath.
  • Our DSR machine cannot characterize PG greater than 100. Once we have recovered the RAS binder we work with blends of PG or Recycling agents.
  • This slide shows the physical properties of hot mix recycling agents contained in ASTM D4552. The important properties mentioned include:(1) Viscosity at 60oC, (2) Flash point, (3) Percentage of Saturates, and (4) Viscosity Ratio (Table 8-2)
  • In the final analysis it’s all a matter of having the right proportions of materials during production. BTW notice the tile roof on the house – No shingles here.
  • It always helps to have a great crew.
  • Getting intimate with the mix helps.
  • Earlier you saw a picture of giant tusks. Just like that photo you see giraffe forming the letter M. I know your think it stands for Mascarenhas. The message here is M for more RAP.1
  • Transcript

    • 1. 11 HIGH RAP % IN HMAHIGH RAP % IN HMA CALAPA SPRING CONFERENCE ONTARIO APRIL 10, 2014
    • 2. 22
    • 3. 33 WHAT IS RASWHAT IS RAS  Recycled Asphalt ShinglesRecycled Asphalt Shingles  About a dozen manufacturersAbout a dozen manufacturers  Four out of five homes are covered withFour out of five homes are covered with asphalt shingles.asphalt shingles.  111 million squares of shingles111 million squares of shingles  123 million tons123 million tons
    • 4. 44 COMPOSTION OF ROOFINGCOMPOSTION OF ROOFING SHINGLESSHINGLES  30% TO 40% ASPHALT CEMENT. Harder (About 2530% TO 40% ASPHALT CEMENT. Harder (About 25 Pen @77F) than paving asphaltPen @77F) than paving asphalt  40% to 60% hard rock granules (minus #10) and filler40% 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 or1% to 12% fiber (0.5 to 4.5mm long fiberglass or cellulose) felt or miscellaneous materials.cellulose) felt or miscellaneous materials.
    • 5. 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
    • 6. 66 WHY RECYCLE?WHY RECYCLE?  Landfill shortage. If RAS not recycled itLandfill shortage. If RAS not recycled it will end up in landfills - 95% of allwill end up in landfills - 95% of all roofing waste.roofing waste.  In 1992 disposal costs ranged from $30In 1992 disposal costs ranged from $30 to $55/tonto $55/ton  Beneficial UseBeneficial Use  Excellent performanceExcellent performance
    • 7. 77 USE OF RASUSE OF RAS  AASHTO MP15-12 Use of ReclaimedAASHTO MP15-12 Use of Reclaimed Asphalt Shingles as an Additive in HMAAsphalt Shingles as an Additive in HMA  AASHTO PP-53 2012 – DesignAASHTO PP-53 2012 – Design Considerations When Using RAS in NewConsiderations When Using RAS in New HMAHMA  Researchers are still trying to come upResearchers are still trying to come up with a simple mix design method.with a simple mix design method.
    • 8. 88 Design ConsiderationsDesign Considerations  Determining Shingles AggregateDetermining Shingles Aggregate Gradation and Specific GravityGradation and Specific Gravity  Estimating the Contribution of the RASEstimating the Contribution of the RAS asphalt binder to the Final Blended Binderasphalt binder to the Final Blended Binder in New HMA.in New HMA.  PG and Percentage of the Virgin AsphaltPG and Percentage of the Virgin Asphalt Binder in New HMABinder in New HMA
    • 9. 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) orEither Abson Recovery (ASTM D1856) or Rotary Evaporator (ASTM D 5404)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 chartsBlend to PG 64 -10 with blending charts
    • 10. 1010 Vulcan Los Angeles Regional LabVulcan Los Angeles Regional Lab Viscosity Testing Extraction/Recover y
    • 11. Recovery of RAS BinderRecovery of RAS Binder 1111
    • 12. 1212
    • 13. Typical RAS MaterialTypical RAS Material 1313
    • 14. RAS Test DataRAS Test Data 1414
    • 15. Recycling Agents (ASTM D4552) RA1 RA5 RA25 RA75 RA250 RA500 Viscosity @ 60C (cSt) 50-175 176-900901- 4500 4501- 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
    • 16. 1616 Mix Design ProceduresMix Design Procedures  Asphalt Content, Aggregate GradationAsphalt Content, Aggregate Gradation and PG or RAPand PG or RAP  Gradation of New AggregateGradation of New Aggregate  Combined Gradation of Recycled MixCombined Gradation of Recycled Mix  Either Hveem, Marshall or SuperpaveEither Hveem, Marshall or Superpave  Binder Replacement specBinder Replacement spec
    • 17. Binder ReplacementBinder Replacement  Binder Replacement +( (A x B)/C ) x 100Binder Replacement +( (A x B)/C ) x 100  A = RAS percent binder contentA = RAS percent binder content  B = RAS percent in mixtureB = RAS percent in mixture  C = Total percent binder content inC = Total percent binder content in mixture.mixture. 1717
    • 18. Binder Replacement ExampleBinder Replacement Example  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 = 5.2C = Total percent binder in mixture = 5.2  Binder Replacement = 24.8%Binder Replacement = 24.8% 1818
    • 19. 1919 Caltrans Superpave SpecsCaltrans Superpave Specs  For HMA with Binder Replacement lessFor HMA with Binder Replacement less than or equal to 25% of OBC you maythan or equal to 25% of OBC you may REQUEST step down PG binderREQUEST step down PG binder  For HMA with a binder replacementFor HMA with a binder replacement greater than 25% but less than 40% ofgreater than 25% but less than 40% of OBC you MUST USE step down PGOBC you MUST USE step down PG binderbinder  No provisions for Rejuvenating AgentsNo provisions for Rejuvenating Agents
    • 20. 2020 Caltrans Superpave SpecsCaltrans Superpave Specs  For HMA with RAP the maximum binderFor HMA with RAP the maximum binder replacement must be:replacement must be: – 25.0% percent of OBC for surface course25.0% percent of OBC for surface course – 40.o% percent of OBC for lower courses40.o% percent of OBC for lower courses
    • 21. 2121 RAP Processing
    • 22. 2222 RAP Processing
    • 23. 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 fractionYou may use the Coarse fraction, fine fraction or combo of both.or combo of both. 2323
    • 24. 2424 Fine Fractionated RAPFine Fractionated RAP StockpileStockpile
    • 25. 2525 Coarse Fractionated RAP ProductCoarse Fractionated RAP Product 3/8”minus RAP
    • 26. 2626
    • 27. 2727
    • 28. 2828
    • 29. 2929
    • 30. 3030 THANK YOU
    • 31. 3131 QuestionsQuestions Pascal Mascarenhas Vulcan Materials mascarenhasp@vmcmail.com 626-856-6190 Phone 626-969-2918 Fax 626-705-6611 Cell

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