Recycled Asphalt Pavement

Transcription

1 Recycled Asphalt Pavement Gavin Soward QDTMR Principal Engineer Road Surfacings Rob Vos AAPA Queensland Executive Recycled Asphalt Pavement 1

2 Benefits of RAP Benefits Reduced energy consumption Conserving raw materials Reduced cost Recycled Asphalt Pavement 2

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4 The Findings RAP increased resilient modulus RAP increased creep resistance RAP can be readily manufactured to a nominated design Fragmenting and screening required Recycled Asphalt Pavement 4

5 The Recommendations Provision should be made within Departmental documentation for RAP material to be able to be incorporated into production mix used on Main Roads works Recycled Asphalt Pavement 5

6 MRTS30 and 31 RAP Requirements RAP permitted up to 15% Required to be fragmented and screened Recycled Asphalt Pavement 6

7 The Future Research on fatigue properties Use of higher percentages of RAP Use in surfacings??? Recycled Asphalt Pavement 7

8 HMA producer s view Changed Main Roads specification welcomed Production based focus simplifies changes to mix approval Is common practice in local municipal asphalt - 10 to 20 years experience Mackay Gladstone Sunshine Coast Gold Coast Recycled Asphalt Pavement 8

9 Portable RAP crushing and screening plant Recycled Asphalt Pavement 9

10 Portable RAP production plant with stockpiles Recycled Asphalt Pavement 10

11 RAP valuable and locked up Recycled Asphalt Pavement 11

12 Recycled Asphalt Pavement 12 Fixed RAP production facilities Uniformity of gradation & binder content

13 RAP into Batch Plant Pug Mill Recycled Asphalt Pavement 13

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16 Three covered stockpile bins Three RAP cold feeders Covered collector belt Recycled Asphalt Pavement 16

17 Screen Screen & delivery belt Recycled Asphalt Pavement 17

18 Difficult upgrade RAP capability will vary across HMA plants space considerations extra capex to upgrade plant age vs investment size of market for RAP availability of RAP Easy expansion Recycled Asphalt Pavement 18

19 RAP & Sustainability Reduces material consumption binders / aggregates Energy saving carbon saving Warm Mix Asphalt extra advantages Recycled Asphalt Pavement 19

20 RAP is Worth the Virgin Material it Replaces Recycled Asphalt Pavement 20

21 Waste dump site Bitumen $800 / tonne 5.5% $44 materials Aggregate $38 / tonne 93.5% $35 $81 / tonne Lime $230 / tonne 1% $2 plus Haulage $0.50 / tonne / km???? haulage RAP at 15% ( 3.5% bitumen, 96.5% aggregate) = 0.15x($800 x.035 +$38 x.965) - processing haulage = $9.70 less processing less haulage cost (not 15% $81) RA Asphalt Plant Road Project with RAP available Aggregate quarry At least 15% RAP * saves haulage waste * reuses bitumen (reduces mix requirement) * reduces aggregate (haul & volumes) Recycled Asphalt Pavement 21

22 RAP potential Availability Major projects high volumes (>75Kt p.a.) Collection & management on smaller works (>25Kt p.a.) Need to develop collection capabilities Usage Current 15%, Cl320 DG14 & 20 in bases good start Limited in effectiveness limited demand Wearing course not included Long term savings expect $2 to $5 per tonne for 20% Business as usual = $1.25 million budget saving = $2.88 million resource saving Recycled Asphalt Pavement 22

23 RAP members capacity All new plant in SEQ can handle 25% to 50% RAP Projects are being undertaken with up to 30% RAP Stockpiles of more than tonnes ready to be used Mackay Gladstone Sunshine Coast Gold Coast Recycled Asphalt Pavement 23

24 RAP next steps Get going on major projects higher percentages >30% possible Would increase rut resistance / modulus Binder stiffening CL320 towards CL600 Cost savings on cheaper binder (~10%) in wearing course Currently used for municipal areas along coast Should be suitable in low skid demand areas Overlays, milling & shape correction in future Recycled Asphalt Pavement 24

25 Valuable product RAP - vision savings possible up to $8 / tonne (after capex) Ongoing improvements & energy efficiency Commercial drivers best for implementation Even better when used with Warm Mix Asphalt C0 2, worker friendly, energy saving Recycled Asphalt Pavement 25

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