Application of Warm Mix Asphalt on Non- Typical Paving Projects. Steve Jackson NB West Contracting St. Louis, MO

Transcription

1 Application of Warm Mix Asphalt on Non- Typical Paving Projects Steve Jackson NB West Contracting St. Louis, MO

2 Outline Warm Mix Asphalt (WMA) using polymer modified asphalt cement, Reclaimed Asphalt Pavement (RAP), and Reclaimed Asphalt Shingles (RAS) Cold Weather Paving with WMA Bonded Dense Graded WMA Ultra Thin Bonded Asphalt Wearing Course WMA

3 Definitions SP Superpave 12.5 mm nominal max aggregate size surface mix RAS Recycled Asphalt Shingles Tear off shingles not factory rejects MoDOT Missouri Department of Transportation

4 Why Warm Mix? Moisture Surfactant in Evotherm Longer haul distances Compaction aid Joint bump prevention Higher recycled percentages

5 Why Warm Mix? Reduced emissions Non-Attainment Area Less heat on workers Consistency in Pay Factors

6 Rte. 50, Gasconade County SP 125C, PG RAP Shingles Hot Mix Asphalt 60 minute haul to the job Experienced VMA collapse. Deducts, we shut the job down

7 Route 50 Warm Mix Asphalt 1 st Test Air voids: 3.5% Density: 95.9%, 96.1% Joint Density: 95.0% Average density (Job): 93.5% 19.1% DEDUCT on density

8 Route 50

9 Route 50

10 Route 50

11 I-44 Maintenance

12 I-70 Maintenance SP 125CLP PG Evotherm 3G M1 Shingles RAP 60 mile haul Cold weather paving, ~23 F

13 I-70

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15 Ease of Use

16 I-70

17 I % Density Good Paving Practices Transfer machine Tarp and strap

18 I-70

19 Cold Weather Paving City of Rolla December 2010 Occupancy Permit needed to be issued for a new housing development

20 City of Rolla

21 Fresh Concrete

22 Good Paving Practices

23 TSR Bonus in Missouri 3% bonus for field TSR over 90.0% Evotherm is an adhesion promoter No anti-strip needed $ $1.00 per ton savings by removing the anti-strip agent

24 Thermal Segregation

25 Density Consistent mat temperature gives more consistent density Pay factor Unconfined joint density Less heat Less lateral movement Joint density spec trumps all other specs in Missouri. Removal if joint density is not obtained.

26 Other Benefits Mix starts at a lower temperature Open the road quicker Less delay to motorists Green Technology St. Louis Non-Attainment Area DNR C0 2 emissions

27 Reduced Plant Wear

28 Recycle Issues Superheating Aggregates

29 Warm Mix Asphalt Yes you can use RAP and shingles with Warm Mix Asphalt Lower temperature may decrease drum heat issues

30 Increased Recycled Content MoDOT allows up to 40% Effective Binder replacement PG in the contract PG for high recycle

31 MoDOT RAP RAS Effective Asphalt Workbook Contribution of Binder from Recycled Materials Effective Binder Computation Gmm Gse Pb Type of Stockpile Pbmv 5.10 Gb Pba 1.36 virgin - Quarried w/o RAS aggregate Pbmv w/ RAS 4.80 Gsb Pbe 4.44 reclaim - Reclaimed aggregate such as concrete, steel slag, wet bottom slag, chat RAP - Reclaimed asphalt pavement Stockpile Type P x P br F* smv RAS - Reclaimed asphalt shingles P s br P sr P P smr P bmr virgin RAP RAS P be 4.44 P bev 3.44 F= 1.00 Pbmv P smv * Leave F blank to calculate, then insert calculated F in table. P sr x P br 1.15 Pb Pbmr2 Pbr2 Pbr2 P smr Psr2 Psmr2 RAS P bmr 1.08 R 77 Pbmr1 Pbr1 Pbr1 Psmr1 RAP Psr1 Pb Psv(1,2,..) Psr(1,2,..) Pbr(1,2,..) Psmv(1,2,..) Psmr(1,2,..) Psmr Pbmr(1,2,..) Pbmr Pbmv R F - Percent total binder in mixture - Pecent stone by fraction for virgin or reclaimed aggregate - Pecent stone by fraction for RAP or RAS aggregate - Percent binder by fraction in RAP or RAS - Pecent stone by fraction for virgin or reclaimed aggregate by weight of total mixture - Pecent stone by fraction for RAP or RAS aggregate by weight of total mixture - Pecent stone of RAP or RAS aggregate by weight of total mixture - Percent binder by fraction in RAP or RAS by weight of total mixture - Percent binder of RAP or RAS by weight of total mixture - Pecent new binder by weight of total mixture - Percentage of new binder (Pbvm) to total binder (Pb) - Availability factor for asphalt shingles (Typical 0.50 for 1/2" minus, 0.75 for 1/4" minus) Psm Psmv2 Psmv1 Steel Slag Limestone Psv2 Psv1 P smv1 100 P sr1 P br1 Psv Pb P P P sr2 br2 sr3 P br3... /100 P P P P P smv smr1 smr bmr bmr Psmv 1 Psmv2 Psmv 3... ( Psr 1 Psr 1 Pbr 1 /100) 100 Pb 100 (( Psr 1 Pbr 1 Psr2 Pbr2 Psr3 Pbr3...) /100) P P P... 1 smr 1 smr 2 smr 3 Psr 1 Pbr Pb Pbmr 1 Pbmr 2 Pbmr 3... Pbmv Pb Pbmr Pbmv 100 R P b Estimated contribution of shingles to total binder content; where: F Pbv Pbmv Pbmr F - Availability factor for asphalt shingles (Typical for 1/2" minus, 0.75 for 1/4" minus) - Virgin binder content of mixture without shingles - Virgin binder content of recycle mixture with shingles - Percent binder in asphalt shingles by weight of total mixture Pbv P P bmr bmv

32 Warm Mix Asphalt Start the day at an elevated temperature Heats bag house Heats transfer machine and screed Hot mix when pulling off your header

33 Warm Mix Asphalt Finish the day at an elevated temperature Keeps transfer machine clean Hot mix for header/end Dries bag house moisture Keeps dryer flights cleaner

34 Dryer Flights

35 Warm Mix Asphalt Works with AC used in Missouri PG PG PG64-22 PG PMA PG PMA

36 2010 Innovations PG PMA with RAP and Shingles with Evotherm 3G Missouri does not allow PMA & RAS Permeability along with cores MoDOT modified Pay Factors to allow for increased compaction. Old: 94.0% +/- 2.0% New: 94.5% +/- 2.5%

37 Rte.. 47 Franklin County Scratch Course ¾ thick SP095C Hot Mix No density requirement RAP, Shingles Surface Mix SP125CLP 5% Shingles, 10% RAP PG PMA Evotherm 3G M1

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39 2010 Innovations Evotherm 3G M1 with Nova Chip Evotherm 3G M1 with Bonded Dense Graded Asphalt through Spray Paver Increased bond strength Clean tack coat Evotherm + Water from emulsion

40 Warm Mix Novachip

41 Clayton Road

42 MAPA Quality Award

43 Bonded Dense Graded Warm Mix Asphalt

44 Bonded Dense Graded Warm Mix Asphalt

45 2011 Innovations West Contracting has moved to ~95% asphalt mixes using Evotherm 3G M1 Worked with Road Science to develop a 9.5mm Thin Bonded Overlay

46 Route 100 Looking for a crack-resistant, thin overlay with long term performance High quality materials High polymer asphalt Rhyolite Trap Rock aggregate

47 Thin Bonded Overlay

48 Thin Bonded Overlay

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50 What do we need to fully implement WMA? Education Commercial applicators, Cities and Counties Implement the best paving practices WMA doesn t fix bad paving techniques

51 Thank You

52 Contact Information Steve Jackson

53 Rock On!