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Pavement Recycling
October 7, 2014
David Kaulfers, P.E., PMP
Assistant State Materials Engineer
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Pavement Recycling
• What it is
• Types
• When to use it
• Elements of the specifications
• What we have done
• Way Forward
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What is it
Simple – Taking existing materials and using
them….again.
But not all recycling is equal…..
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Types
• RAP (Reclaimed Asphalt Pavement) in Hot Mix
• Using RAP with the Virgin Mix
Focusing on these types:
• CCPR – Cold Central Plant Recycling
• Typically 100% RAP processed off site and stabilized (thickness varies)
• CIR – Cold In-Place Recycling
• Bound asphalt layers mixed in-place and stabilized (3” to 6”)
• FDR – Full Depth Recycling
• Deep mixing-includes bound and unbound (aggregate/soil) material (6”to12”)
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When to use it
• RAP (Reclaimed Asphalt Pavement) in Hot Mix Asphalt (HMA)
• Used since the 1980’s
• Currently allow up to 30%
• Contractor Option
• CCPR – Cold Central Plant Recycling
• As a base material replacing a portion of Base Mix/Aggregate Base, shoulder
strengthening, can be placed in multiple lifts (3” to 6”)
• CIR – Cold In-Place Recycling
• Pavement has deterioration in the deeper layers (3” to 6”), but only the
bound layers – Major Rehabilitation
• FDR – Full Depth Recycling
• Pavement has deep deterioration (6” to 12”) – secondary roads and primary
routes where applicable – Major Rehabilitation
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CCPR – Cold Central Plant Recycling
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Millings being plant processed
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CCPR – Cold Central Plant Recycling
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Looks Like HMA…..Placed like HMA….
Compacted Like CMA
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CIR – Cold In-Place Recycling
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Cement placed ahead, mixing with
asphalt
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FDR – Full Depth Recycling
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Cement placed ahead, mixing with water
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Elements of the Specifications
• Test Strip Prior to full production
• Quality Control Plan
• Identify team responsible for quality and duties
• Sampling, Testing and Analysis Plan for QC
• Quality Control activities – what is being done
• Actions to meet contract requirements when corrective actions are required
• How the stabilized material will be protected
• Technical Representative
• Experienced with the process
• May be a manufacturer’s representative, consultant or other experienced rep
• Responsible for design of mix (Job Mix Formula)
• Gradation
• Density
• Stabilizing agents
• Water
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What we have done
Since 2008
• FDR, 11 Projects
• CIR, 4 Projects, 3 additional projects
advertised, but not awarded (1 over estimate
and 2 alternate designs not selected)
• CCPR, 2 Projects (one of which is underway)
Lessons
• CIR – Nighttime work, open to traffic too soon
• Apply to the right project can be very
beneficial – an investment 11
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Way Forward
Early Oct 14 – CIR specification to be posted and current FDR specification
circulated for feedback
Mid Oct 14– Draft permissive CCPR spec for Section 200 & 300 circulated
Late Oct 14– Strengthen Recycling Requirements – Issue Materials
Division Memorandum for inclusion in Section 600 – Manuel of
Instructions
Late Nov 14– (Revised – if necessary) FDR Specification posted
Mar 15 – Permissive CCPR spec posted
Approx $50-$60M/year spent on restorative maintenance and
reconstruction – first consideration is recycling.
Use of CIR and CCPR is still new and we are learning together to take
existing materials and use them…..again
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Pavement Recycling
October 7, 2014
David Kaulfers, P.E., PMP
Assistant State Materials Engineer