Technology for a better society 1

Carl Christian Thodesen

Recycling

of

Asphalt Pavements

Technology for a better society 2

Technology for a better society

PEOPLE

PROFIT

PLANET

Technology for a better society

Technology for a better society

1. Warm mix

2. Doubling reclaimed materials use

3. Increased use of porous pavements

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Technology for a better society

1. Warm mix

2. Doubling reclaimed materials use

3. Increased use of porous pavements

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Technology for a better society 7

What are the three most important requirements of a pavement with RAP?

Technology for a better society

1. Cost effective

2. Environmentally responsible

3. Perform well

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Technology for a better society

1. Cost effective

2. Environmentally responsible

3. Perform well

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Technology for a better society 10

Technology for a better society 11

binder 4%

aggregate 96%

1 ton asphalt: by weight

Technology for a better society 12

binder 62%

aggregate 38%

1 ton asphalt: by value

Technology for a better society 13

RAP is a valuable resource

Technology for a better society

1. Cost effective

2. Environmentally responsible

3. Perform well

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Technology for a better society

Santero, N., E. Masanet, and A. Horvath. 2011. “Life-Cycle Assessment of Pavements Part I: Critical Review.” Resources, Conservation, and Recycling. 55(9–10):801–809.

Technology for a better society

Rolling Resistance: Roughness

Rolling Resistance: Structure

Albedo: Radiative Forcing

Albedo: Urban Heat Island

Roadway Lighting

Carbonation

Traffic Delay

Onsite Equipment

Transportation

Materials

Global Warming Potential (Mg CO2e/lane-km)

100 101 102 104 103 105

Santero, N., E. Masanet, and A. Horvath. 2011. “Life-Cycle Assessment of Pavements Part I: Critical Review.” Resources, Conservation, and Recycling. 55(9–10):801–809.

Technology for a better society 17

Technology for a better society 18

RAP is environmentally friendly

Technology for a better society

1. Cost effective

2. Environmentally responsible

3. Perform well

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Technology for a better society

• Statistical Comparison of pavements

• 35% RAP pavements vs. virgin pavements

• Data from 5 test sections

• Pavement sections from 6 -17 years old

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Hong, F., et al. (2010). “Long-Term Performance Evaluation of Recycled Asphalt Pavement Results from Texas: Pavement Studies Category 5 Sections from the Long-Term Pavement Performance Program,” Transportation Research Record 2180, Transportation Research Board, Washington, DC.

Technology for a better society

• IRI

• Rutting

• Fatigue cracking

• Longitudinal cracking

• Transverse cracking

• Block cracking

• Raveling

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Technology for a better society 22

Virgin performed significantly

better than RAP 42%

RAP performed significantly better than

virgin 39%

Insignificant difference

between RAP and virgin

19%

IRI

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0

25

50

75

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nal

Technology for a better society 24

RAP pavements can perform

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What is holding us back?

Technology for a better society

• Specification limitations

• Lack of processing

• Lack of RAP availability

• Past experiences

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Technology for a better society 27

Summary

Technology for a better society

• RAP is a valuable resource

• RAP is environmentally friendly

• RAP pavements can perform

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Technology for a better society

Technology for a better society

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