Asphalt Pavement Magazine - May/June 2018 - 28

SPECIAL FOCUS: RECYCLED MATERIALS AND ECO-CONSCIOUS PAVEMENTS

Reducing Rolling Resistance

to Reduce Emissions

In Europe, low rolling resistance mixtures have been designed for environmental
performance and durability.
By Dr. J. Richard Willis

R

olling resistance is the
force required to keep
a wheel in motion.
Several factors impact
vehicular fuel economy,
including vehicle aerodynamics,
engine type, and, of course,
pavement. Research has suggested
that three pavement properties
might influence vehicular rolling
resistance: smoothness, texture, and
pavement structure or deflection.
While science has consistently
shown that pavement smoothness
and texture always impact rolling
resistance, the research regarding
pavement structure has been
more varied. Last fall, NAPA and
the European Asphalt Pavement
Association (EAPA) co-hosted
the European Asphalt Rolling
Resistance Workshop at the EAPA
office in Brussels, Belgium. The
one-day event was developed
to help both organizations gain
a better understanding of how
asphalt pavements and mixtures
can impact the rolling resistance of
vehicles.
Researchers from Belgium,
Switzerland, the United Kingdom,
and Denmark convened during
the workshop to share their
experiences with EAPA, Eurobitume,
the National Center for Asphalt

Technology (NCAT), and NAPA.
In the United States, research
has investigated the impacts of
pavement properties on rolling
resistance while European efforts
have focused on measuring rolling
resistance. In particular, many
universities and organizations
abroad have developed trailers
that attempt to measure rolling
resistance using either force or
angle-based systems. Draft EU
specifications were even developed
as part of the ROSANNE project, a
collaborative project completed in
2016 that developed measurement
methods for skid resistance, noise
emission, and rolling resistance of
road pavements as a preparation
for standardization. 
During the morning
session of the workshop,
Dr. Ulf Sandberg of the
Swedish National Road
and Transport Research
Institute presented
research on the textural impacts
of an asphalt mixture on rolling
resistance. He also discussed an
innovative approach to directly
pull fuel economy data from trucks
and match that data with pavement
properties from mile-long intervals
of actual pavements. One unique
challenge in Europe is that many

28 * View past issues online at www.naylornetwork.com/nap-nxt

countries have textural requirements
for their roadways as a surrogate
friction and safety measurement.
These requirements account for the
fact that the asphalt mixtures must
have enough texture to remain
safe while also realizing that the
more texture the pavement has, the
greater the rolling resistance.
The afternoon highlighted two
studies, the first of which was
conducted by the Danish Road
Directorate. Denmark, as with most
of Europe, is committed to reducing
© PHOTO COURTESY CARSTEN KARCHER AND FAN GUO

Overall, the rolling resistance device from the
Technical University of Gdansk (TUG) and Belgian
Road Research Center (BRRC) showed the most
consistency and accuracy. Both devices measure
rolling resistance through an angle-based system
instead of a force-based methodology.


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Asphalt Pavement Magazine - May/June 2018

Table of Contents for the Digital Edition of Asphalt Pavement Magazine - May/June 2018

Chairman’s Commentary
Industry News
Tools for the Trade
A Green Answer for Higher Recycling
Reducing Rolling Resistance to Reduce Emissions
Recycled Tire Rubber Mixture Yields High-Performing Road
The Pavement Economics Committee: A Powerful Partnership
Focus on the Field: Job Spotlight
Industry Events
Index of Advertisers/Advertisers.com
Perspectives
Asphalt Pavement Magazine - May/June 2018 - intro
Asphalt Pavement Magazine - May/June 2018 - cover1
Asphalt Pavement Magazine - May/June 2018 - cover2
Asphalt Pavement Magazine - May/June 2018 - 3
Asphalt Pavement Magazine - May/June 2018 - 4
Asphalt Pavement Magazine - May/June 2018 - 5
Asphalt Pavement Magazine - May/June 2018 - 6
Asphalt Pavement Magazine - May/June 2018 - 7
Asphalt Pavement Magazine - May/June 2018 - 8
Asphalt Pavement Magazine - May/June 2018 - Chairman’s Commentary
Asphalt Pavement Magazine - May/June 2018 - 10
Asphalt Pavement Magazine - May/June 2018 - Industry News
Asphalt Pavement Magazine - May/June 2018 - 12
Asphalt Pavement Magazine - May/June 2018 - 13
Asphalt Pavement Magazine - May/June 2018 - 14
Asphalt Pavement Magazine - May/June 2018 - 15
Asphalt Pavement Magazine - May/June 2018 - 16
Asphalt Pavement Magazine - May/June 2018 - 17
Asphalt Pavement Magazine - May/June 2018 - Tools for the Trade
Asphalt Pavement Magazine - May/June 2018 - 19
Asphalt Pavement Magazine - May/June 2018 - 20
Asphalt Pavement Magazine - May/June 2018 - 21
Asphalt Pavement Magazine - May/June 2018 - A Green Answer for Higher Recycling
Asphalt Pavement Magazine - May/June 2018 - 23
Asphalt Pavement Magazine - May/June 2018 - 24
Asphalt Pavement Magazine - May/June 2018 - 25
Asphalt Pavement Magazine - May/June 2018 - 26
Asphalt Pavement Magazine - May/June 2018 - 27
Asphalt Pavement Magazine - May/June 2018 - Reducing Rolling Resistance to Reduce Emissions
Asphalt Pavement Magazine - May/June 2018 - 29
Asphalt Pavement Magazine - May/June 2018 - 30
Asphalt Pavement Magazine - May/June 2018 - 31
Asphalt Pavement Magazine - May/June 2018 - Recycled Tire Rubber Mixture Yields High-Performing Road
Asphalt Pavement Magazine - May/June 2018 - 33
Asphalt Pavement Magazine - May/June 2018 - 34
Asphalt Pavement Magazine - May/June 2018 - 35
Asphalt Pavement Magazine - May/June 2018 - 36
Asphalt Pavement Magazine - May/June 2018 - 37
Asphalt Pavement Magazine - May/June 2018 - 38
Asphalt Pavement Magazine - May/June 2018 - 39
Asphalt Pavement Magazine - May/June 2018 - The Pavement Economics Committee: A Powerful Partnership
Asphalt Pavement Magazine - May/June 2018 - 41
Asphalt Pavement Magazine - May/June 2018 - 42
Asphalt Pavement Magazine - May/June 2018 - 43
Asphalt Pavement Magazine - May/June 2018 - 44
Asphalt Pavement Magazine - May/June 2018 - 45
Asphalt Pavement Magazine - May/June 2018 - 46
Asphalt Pavement Magazine - May/June 2018 - 47
Asphalt Pavement Magazine - May/June 2018 - Focus on the Field: Job Spotlight
Asphalt Pavement Magazine - May/June 2018 - 49
Asphalt Pavement Magazine - May/June 2018 - 50
Asphalt Pavement Magazine - May/June 2018 - 51
Asphalt Pavement Magazine - May/June 2018 - Industry Events
Asphalt Pavement Magazine - May/June 2018 - 53
Asphalt Pavement Magazine - May/June 2018 - 54
Asphalt Pavement Magazine - May/June 2018 - Index of Advertisers/Advertisers.com
Asphalt Pavement Magazine - May/June 2018 - 56
Asphalt Pavement Magazine - May/June 2018 - 57
Asphalt Pavement Magazine - May/June 2018 - Perspectives
Asphalt Pavement Magazine - May/June 2018 - cover3
Asphalt Pavement Magazine - May/June 2018 - cover4
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