Asphalt Pavement Magazine - September/October 2017 - 25

Thinlays with NAPA President Mike Acott
Thinlay work. Thinlays can also be
designed using polymer-modified
binders for improved strength and
cracking resistance. High friction
aggregates can be used for improved
skid resistance.
AP: How is constructing a
Thinlay different from other
asphalt pavements?
Acott: Because Thinlays are
placed in thin layers, there are a
few differences from constructing
thicker sections. First, they cool
more quickly, so it is important
to avoid placing them in cold
temperatures and to keep rollers
close behind to the paver. The
MultiCool software and app are
a good tool for determining how
fast a mix, including a Thinlay
mix, will cool under different
environmental conditions.
Warm-mix asphalt can also be
beneficial for Thinlays as it allows
mixtures to be compacted at lower
temperatures. When placed thinner
than 1.5 inches, compaction
testing will not be possible. A roller
pattern should be established at
the start of the job using nondestructive density gauges and
periodically checked, especially if
environmental conditions change.
One of the most important steps
in placing any type of overlay is the
tack coat. Tack should be uniformly
applied and allowed to break and
set so that construction equipment
does not pull up the tack during
construction. NAPA has some good
guidelines on the placement of
tack coats. There is no difference
in the paving equipment used to
place a Thinlay. Contractors should
balance the plant production,
trucking, paving speed, and
compaction so that the paver

moves at a steady pace for the best
quality. Again, NAPA has some
good guidance on how to balance
production rates.
AP: How are mix design and
quality assurance provided
in Thinlay manufacturing
and paving?
Acott: Thinlays use the same
quality control procedures and
tests used for other asphalt
mixtures; for this reason,
Thinlays likely have the most
rigorous mix design and quality
control procedures in place of
all preservation treatments. The
only difference from other asphalt
mixes in quality control is testing
for compaction, which cannot be
done on layers thinner than 1.5
inches.
AP: How can Thinlay reduce
the life-cycle cost of pavement
ownership?
Acott: The cost effectiveness
of pavement preservation is
well established. By preserving
pavements in good condition,
an owner can avoid costly
reconstruction or rehabilitation.
One thing often overlooked,
however, is that we need to look
beyond preserving just the surface
of the road; the road structure
needs preservation, too. We
should not allow the structure to
deteriorate from the bottom up
and just hold the surface together.
Agencies need to look at their
pavement management systems
and see how each treatment
performs under different distresses.
Only then can they really know
which is the right treatment for the
right road at the right time.

"The cost effectiveness of pavement preservation is well
established. By preserving pavements in good condition,
an owner can avoid costly reconstruction or rehabilitation."

In addition, because Thinlays
can add structure to a road, so
long as distresses have not started,
they can be used to increase
carrying capacity while also
preserving the pavement. This
can be important when changing
growth patterns or traffic levels
mean a road is expected to carry
more traffic than it was originally
designed to support. Being able to
strengthen a road as needs increase
while simultaneously extending
pavement life is a very cost-effective
strategy.
AP: How does Thinlay
contribute to the sustainability
of the pavement?
Acott: Sustainability is about
improving economic, social,
and environmental profiles of a
product. Thinlays do this well by
preserving a pavement's structure,
which can extend pavement
life and forestall the need for
rehabilitation or reconstruction.
As with other asphalt pavement
mixtures, recycled materials and
warm-mix asphalt may be used
to improve the environmental
profile of a mix. And by improving
surface smoothness, drivers gain
improved drivability and reduced
rolling resistance, which improves
fuel economy and reduces CO2
generation. A benefit of smallstone-size Thinlays is that they
have a negative surface texture
compared to a positive surface
texture for chip seals. This negative
surface texture generates less noise
and reduces rolling resistance.
AP: Do you see a future for
Thinlays beyond pavement
preservation? If so, what might
that be?
Acott: Yes, several states are using
small stone (3/8" max. aggregate
size) SMA for high volume traffic.
continued on page 26

Asphalt Pavement Magazine - September/October 2017 * 25



Table of Contents for the Digital Edition of Asphalt Pavement Magazine - September/October 2017

Chairman’s Commentary
Industry News
Back to Basics: Designed to Perform
NAPA President Mike Acott Talks About Thinlays
Asphalt Pavement Alliance 2016 Perpetual Pavement Awards
PerRoad Version 4.3: Perpetual Pavement Design Software
Tools for the Trade
Industry Calendar
Index of Advertisers/Advertisers.com
Asphalt Pavement Magazine - September/October 2017 - Intro
Asphalt Pavement Magazine - September/October 2017 - cover1
Asphalt Pavement Magazine - September/October 2017 - cover2
Asphalt Pavement Magazine - September/October 2017 - 3
Asphalt Pavement Magazine - September/October 2017 - 4
Asphalt Pavement Magazine - September/October 2017 - 5
Asphalt Pavement Magazine - September/October 2017 - 6
Asphalt Pavement Magazine - September/October 2017 - 7
Asphalt Pavement Magazine - September/October 2017 - 8
Asphalt Pavement Magazine - September/October 2017 - Chairman’s Commentary
Asphalt Pavement Magazine - September/October 2017 - 10
Asphalt Pavement Magazine - September/October 2017 - Industry News
Asphalt Pavement Magazine - September/October 2017 - 12
Asphalt Pavement Magazine - September/October 2017 - 13
Asphalt Pavement Magazine - September/October 2017 - 14
Asphalt Pavement Magazine - September/October 2017 - 15
Asphalt Pavement Magazine - September/October 2017 - 16
Asphalt Pavement Magazine - September/October 2017 - 17
Asphalt Pavement Magazine - September/October 2017 - 18
Asphalt Pavement Magazine - September/October 2017 - Back to Basics: Designed to Perform
Asphalt Pavement Magazine - September/October 2017 - 20
Asphalt Pavement Magazine - September/October 2017 - 21
Asphalt Pavement Magazine - September/October 2017 - NAPA President Mike Acott Talks About Thinlays
Asphalt Pavement Magazine - September/October 2017 - 23
Asphalt Pavement Magazine - September/October 2017 - 24
Asphalt Pavement Magazine - September/October 2017 - 25
Asphalt Pavement Magazine - September/October 2017 - 26
Asphalt Pavement Magazine - September/October 2017 - 27
Asphalt Pavement Magazine - September/October 2017 - 28
Asphalt Pavement Magazine - September/October 2017 - 29
Asphalt Pavement Magazine - September/October 2017 - 30
Asphalt Pavement Magazine - September/October 2017 - 31
Asphalt Pavement Magazine - September/October 2017 - Asphalt Pavement Alliance 2016 Perpetual Pavement Awards
Asphalt Pavement Magazine - September/October 2017 - 33
Asphalt Pavement Magazine - September/October 2017 - 34
Asphalt Pavement Magazine - September/October 2017 - 35
Asphalt Pavement Magazine - September/October 2017 - 36
Asphalt Pavement Magazine - September/October 2017 - 37
Asphalt Pavement Magazine - September/October 2017 - 38
Asphalt Pavement Magazine - September/October 2017 - 39
Asphalt Pavement Magazine - September/October 2017 - PerRoad Version 4.3: Perpetual Pavement Design Software
Asphalt Pavement Magazine - September/October 2017 - 41
Asphalt Pavement Magazine - September/October 2017 - 42
Asphalt Pavement Magazine - September/October 2017 - 43
Asphalt Pavement Magazine - September/October 2017 - 44
Asphalt Pavement Magazine - September/October 2017 - Tools for the Trade
Asphalt Pavement Magazine - September/October 2017 - 46
Asphalt Pavement Magazine - September/October 2017 - 47
Asphalt Pavement Magazine - September/October 2017 - 48
Asphalt Pavement Magazine - September/October 2017 - 49
Asphalt Pavement Magazine - September/October 2017 - 50
Asphalt Pavement Magazine - September/October 2017 - 51
Asphalt Pavement Magazine - September/October 2017 - 52
Asphalt Pavement Magazine - September/October 2017 - Industry Calendar
Asphalt Pavement Magazine - September/October 2017 - 54
Asphalt Pavement Magazine - September/October 2017 - Index of Advertisers/Advertisers.com
Asphalt Pavement Magazine - September/October 2017 - 56
Asphalt Pavement Magazine - September/October 2017 - 57
Asphalt Pavement Magazine - September/October 2017 - 58
Asphalt Pavement Magazine - September/October 2017 - cover3
Asphalt Pavement Magazine - September/October 2017 - cover4
Asphalt Pavement Magazine - September/October 2017 - outsert1
Asphalt Pavement Magazine - September/October 2017 - outsert2
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