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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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slide1

Going Green with Sustainable Asphalt

RAP, Recycling, Energy and the Carbon Footprint

Greening the Blacktop

overview
Overview
  • Why Asphalt is sustainable
    • Perpetual Pavements
    • Carbon Footprint
    • RAP & Recycling
    • Warm Mix Asphalt
    • Porous Asphalt
    • Energy & Emission Reductions
slide3
Why

Asphalt is Sustainable

sustainable pavement
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
sustainable pavement6
Sustainable Pavement
  • Requires less energy to construct an asphalt pavement
  • Per ASCE…20% less
  • Less energy consumed by public
  • Less maintenance keeps traffic moving
slide7

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

rehabilitation
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

a carbon footprint is defined as
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

climate registries
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
what is a greenhouse gas
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
what is a greenhouse gas14
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)
regulatory concerns
Regulatory Concerns
  • Efforts to make you report emissions
  • Benefits of being ahead of the wave
  • Demonstrates concern for the public and the environment
opportunities to reduce emissions
Opportunities to Reduce Emissions
  • Sustainable Pavements
  • Warm Mix
  • RAP
  • Plant O & M
  • Truck and other equipment maintenance
slide17
RAP &

Recycling

recyclability
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
why recycle rap into hma
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)
shingles
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
slide21

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.

other recycled materials
Other Recycled Materials

Crumb rubber (from tires)

Steel slag

Glass

slide24

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
what are porous pavements
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

porous pavement
Porous Pavement
  • Stormwater quality improved with:
    • Porous pavement, and
    • Open Grade Friction Course
  • Can eliminate the need for stormwater structures
walden pond 1977
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

warm mix
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!

remedial efforts
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
reduced energy consumption
Reduced Energy Consumption
  • Energy Audits
  • DOE Software
  • Use RAP
  • Warm Mix Can Reduce Energy by

Cover the Aggregate

slide35

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
napa theme
NAPA Theme

RAP + Porous+ Warm Mix + Perpetual Pavements =

Sustainability

summary review
Summary & Review
  • Why Asphalt is sustainable
    • Perpetual Pavements
    • Carbon Footprint
    • RAP & Recycling
    • Warm Mix Asphalt
    • Porous Asphalt
    • Energy & Emission Reductions
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