California Asphalt Pavement Association...— 2016 NAPA Annual RAP/RAS/WMA Survey. 7. ... Account...
Transcript of California Asphalt Pavement Association...— 2016 NAPA Annual RAP/RAS/WMA Survey. 7. ... Account...
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California Asphalt Pavement Association
November 16, 2018Building Better Roads Workgroup, San Diego, CA
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Asphalt PavementRecycling
SurfaceRecycling
Cold-MixRecycling
HMARecycling
Hot In-PlaceRecycling
Central Plant
Cold In-PlaceRecycling
HMA with RAP
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Material generated from the removal of an existing asphalt pavement or excess material generated from the production of an asphalt mix.
Composed of aggregate and asphalt binder.
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• Source of material for the production of asphalt mixes.
• Aggregate• Binder
• Environmental• Reduce waste to landfills• Reduce need for material extraction, production
and transportation• Reduce Emissions
• Mix Performance• Improved resistance to permanent Deformation
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77 million tons RAP used in HMA 99% of the asphalt pavement removed during widening and resurfacingprojects reused in pavement construction
— 2016 NAPA Annual RAP/RAS/WMA Survey
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RUTTING CRACKING (FATIGUE)
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Rocks are REALLY old before we use them
Binders are REALLY old before we use them
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Aggregate Characteristics Aggregate Type Typically same as local sources
Aggregate Gradation Fines (Mill & crush ½” or ¾” mixes)
Binder Characteristics “Stiffer”/Higher viscosity
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Mix Design Keys:
Aggregates Adjust aggregate
proportions Binder Adjust virgin binder
content Adjust virgin binder
grade Consider additiives
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Is extraction, recovery, and testing of the RAP binder properties necessary?
Time Solvents Effects on recovered
binder
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0-15% RAP Select Normally Used
Binder Grade
16-25% RAP Reduce the specified PG
grade (high and low requirements) by 6°C ª Ex. If PG 64-10 Normal,
then PG 58-16
>25% RAP Use Blending Charts
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Caltrans: allows up to 25% in HMA-A 0-15% - no change in virgin Binder Grade 15-25% - reduce binder grade 6C for high and low
temperature. No recycling agents.
Greenbook: allows high RAP mixes 0-25% - no change in virgin binder grade >25% - evaluate with blending charts to meet
specified grades. Recycling agents allowed.
City of Los Angeles: requires minimum 50% RAP in dense graded mixes with recycling agents.
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Sustainable Reducing virgin resource
needsª Petroleumª Aggregate
Reducing waste from construction projects
Proven Performance Research Projects State DOTs Local Agencies
Specification tools are in-place!!!
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Brandon Milar, P.E.Technical DirectorCalifornia Asphalt Pavement Association(916) [email protected]
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