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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
5
Technology for a better society
1. Warm mix
2. Doubling reclaimed materials use
3. Increased use of porous pavements
6
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
8
Technology for a better society
1. Cost effective
2. Environmentally responsible
3. Perform well
9
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
14
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
19
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
20
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
21
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
Technology for a better society 23
0
25
50
75
100%
RA
P p
ave
me
nts
pe
rfo
rmin
g e
qu
al o
r b
ette
r th
an o
rigi
nal
Technology for a better society 24
RAP pavements can perform
Technology for a better society 25
What is holding us back?
Technology for a better society
• Specification limitations
• Lack of processing
• Lack of RAP availability
• Past experiences
26
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
28
Technology for a better society
Technology for a better society
29