why more recycling of asphalt pavements? · some facts to start: • asphalt is 95% stone and 5%...
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Why More Recycling of Asphalt Pavements?
Vince Egan Director
International Sales Asia Oceania
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Some Facts to Start:
• Asphalt is 95% Stone and 5% Asphalt
• 2.6M Miles of US Roads are 94% Surfaced with Asphalt
• 85% of Parking Lots & Airports are Surfaced with Asphalt
• There are 4,000 mixing plants in the USA
• In US, 500,000,000 tons of Asphalt are produced annually
• 60,000,000 tons is recycled into pavement annually
• 40,000,000 tons is recycled into other applications
• There are 300,000 employees in this industry
• NCAT Facility (40,000 sq. ft., 1.7 mile test track, $5M budget)
• Asphalt Plants have been de-listed by the EPA
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Four Technologies that have the potential to transform the field of “Sustainable Pavements” :
• Warm Mix Asphalt (Typically 320°F now 280° to 212°)
• Doubling the use of Recycled Asphalt Pavements (RAP)
• Perpetual Pavements
• Porous Pavements and Open Graded Pavements
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Doubling the use of Recycled Asphalt Pavements (RAP):
• Currently States Average Only 12% RAP
• Americas most Recycled Product (100M tons per year)
• Roofing Shingles are being introduced
• What if we increased RAP to 25% average per state? • 10% less greenhouse emissions• or over 2 million tons annually
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RAP
• Cold Planing generates “RAP” -Recyclable Asphalt Pavement
• All RAP is reusable as:– 1) New Hot Mixed Asphalt– 2) Cold Mixed Asphalt– 3) Stabilized Aggregate Base– 4) Aggregate Base
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Cold Recycling
Introduction to cold in-place recycling
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Two major types of treatment
• Partial Depth– 0 to 150 mm (6”) normally– Uses Milling Machines
• Full Depth– Typically 100 mm to 400 mm (4” to 16”)– Uses Stabilizers
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Single Machine Recycling
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The Other Partial Depth Methods
Wirtgen adds a screed to their W-2100R to place the material.
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The Train Machine Concept
Used when the Engineer’s design requires milled material needs to be screened, be of a
uniform size and fully mixed in a pugmill
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RT-500 Roadtec CIR Trailer
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The screen deck is fed by the milling machine if the material is too big, it goes to a crusher to reduce the size, an oversize conveyor loop back to the top of the screen. If the material passes the screen it goes to a belt and a belt scale to feed a
double shaft pugmill.
As the belt scale sends the weight back to the computer, the pump sends the right amount of additives to the pugmill just as the material goes in. The now sized, additive added and mixed material is dropped onto the ground in a windrow ready to pave.
This machine can also be fed by a front end loader and can operate as a stand alone mixing unit without the milling machine for some
static site projects.
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An Astec Mobile 5 x 16 Screen deck with electric drives being fed by the rear loading RX-900-4 milling machine. A Telsmith 4248 Impactor crusher reduces the over size and re-circulates this to the screen deck. A 1.2 m wide conveyor with a weigh bridge weighs the material, sends a signal to the Bearcat computer that open and closes valves to add the liquid additives to the KPI pugmill. These can be emulsions, foamed asphalt and/or other liquids or solids. A portable generator set runs the entire CIR Trailer (RT-500).
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RT-500 Working in Nevada
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Full Depth Recycling
• Normally done with a Stabilizer• Complete depth of materials are used• Various materials are used as a stabilization
medium – – Water– Cement, Lime or Fly ash– Emulsion (Water and Bitumen mixed)– Foamed Asphalt– Specialty oils and stabilization liquids
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Full Depth means Stabilizers• Originally designed to work in soils, the stabilizer has now become a Full Depth pavement recycling machine.
• The two shown here are adding fly ash into soil to create road (top) or parking lot base (bottom).
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Stabilizers
• Stabilizers are used for pavement in-place recycling
• The Caterpillar Stabilizer shown here is working on a Michigan Interstate Highway
• This project used Bituminous Emulsion and was overlaid by two lifts of HMA, a binder layer and a wearing course.
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Stabilizers use cement•Dry Cement or fly ash can be placed on the ground and the stabilizer will mix this into the underlying materials.
•At the left, a wet slurry is sprayed onto the ground and the stabilizer is used to mix this into the roadway being stabilized.
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Stabilizers come in Various sizes
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Stabilizers reuse all materials
The use of a stabilizer can rehabilitate pavements that are almost beyond hope.
Additives have been developed that will rejuvenate the lowest residual penetration grades and mix these materials into the base to create a new base
100% recycling is a major goal of the stabilization industry
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Screening and Processing RAP
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Pavement Recycling
• Approximately 100,000,000 tons of asphalt pavement is reclaimed each year.
• That is 95% of what is produced using virgin materials.
• 75% is reused for new pavement. • Another 20% is recycled for other highway
uses (aggregate base, etc.)
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Most Difficult Part of Implementation is
GETTING STARTED
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Level 1
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Level 1
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Level 2
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Level 2
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Level 3
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Level 3
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Level 4
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Level 4
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Relocateable System
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Relocateable System
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www.berapready.com www.befrapready.com
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Why More Recycling?Because it is good for the environment and economically sustainable.
Vince Egan Director
International Sales Asia And Pacific Rim