Asphalt Pavement Magazine - May/June 2018 - 27

A Green Answer for Higher Recycling
with an asphalt mix temperature
goal of 290 to 300 degrees
Fahrenheit.
Hennepin County's 10-wheel
trucks delivered the mix to an
asphalt paving machine equipped
with sonic controls. They used a
10-ton steel roller in vibratory mode
for initial compaction, which the
roller operator found "easier" on
the southbound lanes treated with
Delta S, according to a survey of the
crew. Elsner said they gave a survey
to the crew members after project
completion and learned that the
team found the southbound lanes
"stickier, but a lot more forgiving
when locking joints or fixing spots."
The survey responses also
showed both mixtures posed the
same difficulty to clean from tools
and equipment after cooling, but
the mixture treated with Delta S
was easier to clean up when still
warm. The crew discovered the
need to spray release agent in truck
bodies before every load to facilitate
smooth movement of material
dosed with Delta S, and found that
the Delta S-treated mixture reacted
to the release agent better than
the control mixture. To the naked
eye, the crew members saw no
difference between the northbound
and southbound mats, but did say
the seams (joints) looked better in
the southbound section.

The Delta S rejuvenator is blended inline at a rate of about 1.5 pounds per finished ton, which Nolan
described as "an exceptionally small amount."

While the crew member survey
represents subjective information,
it gives Hennepin County and
MnDOT a starting point for in-field
research. Elsner said they'll review
the pavement at six months and
again at one year for cracking and
oxidation. She said they specifically
want to learn if it will take longer for
the cracking to come back and what
difference they can get out of the
age of the lanes. She hopes to be able
to use an even higher percentage of
RAP in future mixtures.
"The fact that Delta S is a green,
sustainable product is a factor;
however, the primary concern is

to extend the life of the overlay by
delaying the reflective cracking,"
Elsner said. "That's the primary
benefit we hope to see. With the
side-by-side comparison, we will be
observing if there is a difference in the
oxidation rate with the Delta S." AP
Sandy Lender is a freelance writer and
member of the Construction Media
Alliance, based in Beverly Hills, Fla.
© All photos provided by NAPA

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Asphalt
Pavement Magazine
- May/June 2018
* 27
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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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