Post on 08-Mar-2018
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Recycled Asphalt Pavement
Gavin SowardQDTMR Principal Engineer Road Surfacings
Rob VosAAPA Queensland Executive
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Benefits of RAP
• Benefits– Reduced energy
consumption
– Conserving raw materials
– Reduced cost
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The Findings
• RAP increased resilient modulus
• RAP increased creep resistance
• RAP can be readily manufactured to a nominated design
• Fragmenting and screening required
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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”
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MRTS30 and 31 – RAP Requirements
• RAP permitted up to 15%
• Required to be fragmented and screened
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The Future
• Research on fatigue properties
• Use of higher percentages of RAP
• Use in surfacings???
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Gold Coast
Sunshine CoastGladstone
Mackay
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
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Portable RAP crushing and screening plant Portable RAP crushing and screening plant
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Portable RAP production plant with stockpilesPortable RAP production plant with stockpiles
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RAP valuable and locked upRAP valuable and locked up
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Fixed RAP production facilities
Uniformity of gradation & binder content
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RAP into Batch Plant Pug Mill
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Three covered stockpile bins Three RAP cold feeders
Covered collector belt
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Screen
Screen & delivery belt
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Easy expansion
Difficult upgrade
RAP capability will varyacross HMA plants• space considerations• extra capex to upgrade• plant age vs investment• size of market for RAP• availability of RAP
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RAP & Sustainability
• Reduces material consumption – binders / aggregates
• Energy saving – carbon saving
• Warm Mix Asphalt – extra advantages
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RAP is Worth the Virgin Material it Replaces
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RA
Road Project with RAP available
Waste dump siteA
ggregate quarry
Asphalt Plant
At least 15% RAP* saves haulage “waste”* reuses bitumen (reduces mix requirement)
* reduces aggregate (haul & volumes)
Bitumen $800 / tonne 5.5% $44 materialsAggregate $38 / tonne 93.5% $35 $81 / tonneLime $230 / tonne 1% $2 plusHaulage $0.50 / tonne / km ???? haulageRAP 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)
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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
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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 6 000 tonnes ready to be used Gold Coast
Sunshine CoastGladstone
Mackay
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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
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RAP - vision• Valuable product
– 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 – C02, worker friendly, energy saving
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