Going Green with Sustainable Asphalt
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Going Green with Sustainable Asphalt RAP, Recycling, Energy and the Carbon Footprint. Greening the Blacktop. Overview. Why Asphalt is sustainable Perpetual Pavements Carbon Footprint RAP & Recycling Warm Mix Asphalt Porous Asphalt Energy & Emission Reductions. Why

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Going Green with Sustainable Asphalt

RAP, Recycling, Energy and the Carbon Footprint

Greening the Blacktop


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Overview

  • Why Asphalt is sustainable

    • Perpetual Pavements

    • Carbon Footprint

    • RAP & Recycling

    • Warm Mix Asphalt

    • Porous Asphalt

    • Energy & Emission Reductions


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Why

Asphalt is Sustainable



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Sustainable Pavement

  • Durability…

    • Asphalt is the Perpetual Pavement

  • Road itself doesn’t wear out

  • Simple, fast maintenance

  • Reclaimed…is then reused

  • Total removal/reconstruction not needed


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Sustainable Pavement

  • Requires less energy to construct an asphalt pavement

  • Per ASCE…20% less

  • Less energy consumed by public

  • Less maintenance keeps traffic moving


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Perpetual Pavements

}

40-75 mm STONE MATRIX ASPHALT, OGFC or Superpave

100 mm

to

150 mm

Zone

Of High

Compression

High Modulus

Rut Resistant Material

(Varies As Needed)

Flexible Fatigue Resistant

Material 75 - 100 mm

Max Tensile Strain

Pavement Foundation


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Rehabilitation

  • Possible Distresses

    • Top-Down Fatigue

    • Thermal Cracking

    • Raveling

  • Solutions

    • Mill & Fill

    • Thin Overlay

Mill Surface – Use for RAP

{

High Quality Stone Matrix, OGFC or Superpave

50 - 100 mm

20+ Years

Later

Structure Remains Intact




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A carbon footprintis defined as:

The total amount of greenhouse gases produced to directly and indirectly support human activities, usually expressed in equivalent tons of (CO2)

Doesn’t segregate GHGs

Environmental Sustainability


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Climate Registries

  • Organizations that collect and compile emissions data generally voluntary (CA, NE US)

  • Encourages voluntary early actions to increase energy efficiency and decrease GHG emissions


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What is a Greenhouse Gas?

  • Gases that trap heat in the atmosphere – Allows us to live here

  • Some occur from nature, others from anthropogenic activities


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What is a Greenhouse Gas?

  • Principal greenhouse gases entering the atmosphere from human activities are:

    • Carbon dioxide (CO2)

    • Methane (CH4)

    • Nitrous Oxides (N2O)

    • Fluorinated gases (HFCs & PFCs)


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Regulatory Concerns

  • Efforts to make you report emissions

  • Benefits of being ahead of the wave

  • Demonstrates concern for the public and the environment


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Opportunities to Reduce Emissions

  • Sustainable Pavements

  • Warm Mix

  • RAP

  • Plant O & M

  • Truck and other equipment maintenance


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RAP &

Recycling


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Recyclability

  • Asphalt is the No. 1 recycled material

  • Biggest Re-user

  • 1995 FHWA Report to congress

    • 90 Million tons reclaimed

    • 80% recycled

  • 2006 Contractor Survey

    • ~69% reused in HMA

    • ~27% other recycling

    • <3% discarded


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Why Recycle RAP into HMA?

  • Best and Highest use

  • Reduces demand for new materials

  • Reduces carbon footprint

  • Contains valuable materials

    • Aggregate ~95% >$10/ton

    • Asphalt ~5% > $400/ton

    • Value >$29.50/ton (minus processing)


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Shingles

  • Shingles

    • Materials used in HMA

      • >20% asphalt binder

      • Fibers

      • Sand

    • Usually 5% of mix

      • Saves 1% binder > $6.00/ ton of HMA/WMA

    • Tear-offs


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Over the past two years, MoDOT has allowed contractors to put used shingles that have been removed from rooftops into their asphalt mix. The result is a very durable, more-rut resistant asphalt at a much lower price.

The use of recycled shingles saves $3 to $5 per ton of asphalt. That may not sound like much at first, but consider this: a typical resurfacing project would use about 30,000 tons of asphalt, for a savings of $90,000 to $150,000.


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Other Recycled Materials

Crumb rubber (from tires)

Steel slag

Glass



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Lower Temperature Advantages

  • Lower energy consumption (≈30%)

  • Lower plant wear

  • Decreased binder aging

  • Early site opening – Return to user

  • Cool weather paving

  • Compaction aid for stiff mixes

  • Cooler working conditions



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What are Porous Pavements?

Open-Graded HMA/WMA ~ 2 ½”

½” Agg. (#57) ~ 1” – 2” Thick

Clean Uniformly Graded 2”-3”

Crushed Agg. (#2) – 40% Voids

Non-Woven Geotextile

Uncompacted Subgrade


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Porous Pavement

  • Stormwater quality improved with:

    • Porous pavement, and

    • Open Grade Friction Course

  • Can eliminate the need for stormwater structures



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Walden Pond 1977

1997 Report: “Twenty years later, a long time for one paving job on that busy parking lot, it still looks good and works well.”

2008



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Warm Mix

  • Will dominate the market in < 5 years

  • Reduced energy consumption

  • Reduced emissions

    • No hazardous fumes/worker exposure

  • Plants compatible in congested areas

  • No odors

    The sooner the better!


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Remedial Efforts

  • Use the components of the carbon footprint to identify problem areas

  • Take action and make adjustments to reduce emissions

  • Switch to Warm Mix sooner

  • Conduct energy audits

  • Take action to reduce energy



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Reduced Energy Consumption

  • Energy Audits

  • DOE Software

  • Use RAP

  • Warm Mix Can Reduce Energy by

    Cover the Aggregate


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Why is Asphalt Sustainable

  • 100% Recyclable

  • Can use other recycled materials

  • Low carbon footprint pavement

  • Long life & fast resurfacing

  • Warm-Mix Asphalt

  • Porous pavement for stormwater


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NAPA Theme

RAP + Porous+ Warm Mix + Perpetual Pavements =

Sustainability


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Summary & Review

  • Why Asphalt is sustainable

    • Perpetual Pavements

    • Carbon Footprint

    • RAP & Recycling

    • Warm Mix Asphalt

    • Porous Asphalt

    • Energy & Emission Reductions



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