Asphalt Pavement Magazine - May/June 2018 - 49

SPONSORED CONTENT

Enabling sustainable practices through
performance-based innovations
The asphalt industry continually strives to incorporate
sustainable practices that improve performance and reduce
the environmental impact while remaining cost competitive.
One growing area is increasing recycled content in
pavement projects, not just in the base layer but in the top
layer as well.
The primary mode asphalt pavement producers have used
to incorporate more recycled content into their pavement is
to add soft asphalt, or flux, to the mixture to offset the effects
of oxidation and aging. Another approach commonly used
has been to use additives that "soften" the aged asphalt.
Unfortunately, these methods have proven problematic
because they lead to rutting in the finished pavement and
other performance issues.

"Our approach was to find a way
to increase recycled content in
asphalt pavement that meets
standard performance specs."
"Asphalt oxidizes as it ages, becoming more brittle,"
said Robert Neumann, Cargill Industrial Specialties (CIS)
North American Asphalt Commercial Lead. "As a result,
using higher levels of recycled content in 'new' pavement
makes the end product stiffer-and the stiffer it is, the more
susceptible it is to cracking."
"Softening asphalt doesn't tackle the real problems of
cracking and rutting," Neumann said. "Our approach
was to find a way for manufacturers to increase recycled
content to produce an asphalt pavement that meets
standard performance specs-even up to 100-percentinclusion rates."

How Cargill's Anova™ asphalt rejuvenators work

Virgin asphalt consists of different chemical fractions, or
building blocks, according to Hassan Tabatabaee, Ph.D.
Anova Asphalt Solutions Global Technical Manager. Each
building block plays an integral role in creating stable,
durable and high-performing asphalt pavement. Aging
"unbalances" these fractions and disrupts the bitumen's
chemical structure.
"We were able to rebalance the chemical composition of
the aged bitumen by replenishing the affected chemical
fractions with a carefully engineered, stable, biobased
additive," Tabatabaee said. "Our proprietary additive
efficiently reestablishes the chemical balance and the
functionality of the aged bitumen."
© 2017 Cargill, Incorporated. All rights reserved.

The left side of the road was paved with 45% RAP, 5% RAS
and Cargill's Anova™ Rejuvenator. The right side of the road
was paved using only 20% RAP.

Unlike many other known additives manufacturers have
used to try to soften aged asphalt, these proprietary
additives truly rejuvenate aged asphalt and restore desired
characteristics. Anova rejuvenators incorporating high
inclusion levels of RAP have passed internal laboratory
tests and independent third-party testing for cracking,
fatigue and rutting.
"Some of our customers are reporting that their customers
like the rejuvenated asphalt better than their previous
mixes," Neumann said. "It's easier to handle and compact;
it looks better-blacker-and it resists aging better.

Reducing raw material costs also improves
sustainability practices

Asphalt mixes incorporating higher recycled content with
Anova rejuvenators can reduce the raw material costs of
asphalt mixes up to 25 percent. At the same time, these
mixes diminish demands for newly mined sand, gravel and
rock and help eliminate the problems of growing stockpiles
and the use of recycled content in low-value uses such as
fill. It also opens the door to a new level of sustainability
around the production of asphalt.
Ultimately, Anova rejuvenators support the industry's
sustainability efforts by enabling even higher incorporation
levels of recycled content that meet
performance criteria and a
money-saving solution that
can serve the asphalt
pavement industry for the
foreseeable future.


http://www.cargill.com/anova-asphalt

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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