Asphalt Pavement Magazine - May/June 2017 - 30

is to fractionate, but match the
asphalt content percentages.

High-Quality Coordination

I-459's on and off-ramps were concrete, requiring an asphalt overlay.

oldest general contractor in
Alabama, we've got where we are
today by operating with integrity
and doing the right thing."

Working Toward the Same Goal
Perhaps because of the longstanding relationships between
companies such as Dunn
Construction or because of the
proximity to the National Center
for Asphalt Technology (NCAT) at
Auburn University, ALDOT treats
its work with contractors as a
partnership. Instead of providing
an asphalt mix recipe that the
contractor must use, ALDOT
allows the contractor to choose
its own materials and submit a
job mix formula that falls within
ALDOT's general parameters.
"We're not just working for the
owner," Dunn said. "We both want
a good job. ALDOT trusts us to
know what we are doing and come
up with a mix that will meet their
requirements. They listen to us."
ALDOT allows the contractor
to create a mix within a range and
percentage of materials and asphalt
content to meet the road's needs,
including traffic volume, speed limit,
and skid resistance. The contractor is
responsible for ensuring the mix they
create lays well, gets density, has a
good appearance, and meets
drainage needs.

Recycled in the Mixes
Within Dunn Construction's
operations to create an asphalt mix
that meets ALDOT's requirements,

the company turns to recycled
materials in the mix to help it
compete. "Our goal is to be the lowcost producer," said Dunn. "Our
quality assurance/quality control,
as well as plant personnel, all make
sure that we produce cost-effective,
high-quality asphalt mixes."
Dunn utiliized the maximum
amount of RAP allowed by ALDOT
in the asphalt mixes. For the roadwidening portion, which required
demolition of a center island as
well as shoulder, Dunn placed a
3-inch base contained 25 percent
RAP, followed by two 2.5-inch
lower binder lifts with 25 percent
RAP, a 2-inch upper binder lift
with 25 percent RAP, and a 1.5inch wearing surface with 20
percent RAP. For better aggregate
coating, rather than temperature
reduction, Dunn used asphalt
foamers in its hot asphalt mix.
To improve friction, the wearing
surface mixture was augmented by
adding blast furnace and steel slag.
As with other minerals incorporated
into Dunn's job mix formula, these
materials are locally sourced and
readily available, principally due
to Birmingham's industrial base,
which results in reduced costs for
both Dunn Construction and the
taxpayer. These materials are much
more affordable than using bauxite.
"We try to recycle as much as
possible. If we don't, it piles up.
We won't run out for a couple
of decades," Dunn said. With
so much RAP on hand, the
company's strategy for using RAP

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

In the work zone, Dunn
Construction was the prime
contractor, subcontracting the
planing of the project to Mill
It Up LLC. The heavily traveled
intersections required precise
planning in order to finish the
grading, planing, concrete grinding
of the on and off ramps, and paving
on time, while simultaneously
restriping the roadway to reflect
the changes being made and
safely guide traffic through the
construction zone in cooperation
with signalization changes.
Existing concrete on and off
ramps received an application
of Open Graded Friction Course
(OGFC) tack coat, which acted
as both a sealant, by protecting
the underlying substrate from
water penetration, and also as
an adhesive for the subsequent
placement of a polymer modified
OGFC. Even at a rate of only 90
pounds per square yard, rideability
and drainage on older concrete
surfaces can be greatly improved.
The majority of the work
occurred at night due to the high
daytime traffic volumes and only
one lane was blocked at a time.
Many of the local businesses
depend on the continuous flow
of traffic through the work
zone, day and night. The project
took a total of 75 work days.

High-Quality, High Value
Dunn Construction's strategy to be
the low-cost, high-quality producer
by using recycled materials paid off.
ALDOT's Hays agrees, "We really
got our money's worth." AP
Martha K. Silver is editor of Asphalt
Pavement magazine. Contact her at
Martha@Woodfield
Communications.com.


http://www.naylornetwork.com/nap-nxt

Table of Contents for the Digital Edition of Asphalt Pavement Magazine - May/June 2017

Chairman’s Commentary
Industry News
Back to Basics: Plants and Pavings
NAPA Launches Emerald Eco-Label Tool
Recycled Materials: 2015 RAP/RAS/WMA Survey Results
A High-Quality Pavement Partnership
Making the Jump From 15 Percent to 40 Percent RAP
One Secret to High Quality Pavements
Industry Calendar
Index of Advertisers/Advertisers.com
Asphalt Pavement Magazine - May/June 2017 - Intro
Asphalt Pavement Magazine - May/June 2017 - cover1
Asphalt Pavement Magazine - May/June 2017 - cover2
Asphalt Pavement Magazine - May/June 2017 - 3
Asphalt Pavement Magazine - May/June 2017 - 4
Asphalt Pavement Magazine - May/June 2017 - 5
Asphalt Pavement Magazine - May/June 2017 - 6
Asphalt Pavement Magazine - May/June 2017 - 7
Asphalt Pavement Magazine - May/June 2017 - Chairman’s Commentary
Asphalt Pavement Magazine - May/June 2017 - 9
Asphalt Pavement Magazine - May/June 2017 - Industry News
Asphalt Pavement Magazine - May/June 2017 - 11
Asphalt Pavement Magazine - May/June 2017 - 12
Asphalt Pavement Magazine - May/June 2017 - 13
Asphalt Pavement Magazine - May/June 2017 - 14
Asphalt Pavement Magazine - May/June 2017 - 15
Asphalt Pavement Magazine - May/June 2017 - 16
Asphalt Pavement Magazine - May/June 2017 - 17
Asphalt Pavement Magazine - May/June 2017 - 18
Asphalt Pavement Magazine - May/June 2017 - Back to Basics: Plants and Pavings
Asphalt Pavement Magazine - May/June 2017 - 20
Asphalt Pavement Magazine - May/June 2017 - 21
Asphalt Pavement Magazine - May/June 2017 - NAPA Launches Emerald Eco-Label Tool
Asphalt Pavement Magazine - May/June 2017 - 23
Asphalt Pavement Magazine - May/June 2017 - 24
Asphalt Pavement Magazine - May/June 2017 - 25
Asphalt Pavement Magazine - May/June 2017 - Recycled Materials: 2015 RAP/RAS/WMA Survey Results
Asphalt Pavement Magazine - May/June 2017 - 27
Asphalt Pavement Magazine - May/June 2017 - 28
Asphalt Pavement Magazine - May/June 2017 - A High-Quality Pavement Partnership
Asphalt Pavement Magazine - May/June 2017 - 30
Asphalt Pavement Magazine - May/June 2017 - 31
Asphalt Pavement Magazine - May/June 2017 - 32
Asphalt Pavement Magazine - May/June 2017 - 33
Asphalt Pavement Magazine - May/June 2017 - Making the Jump From 15 Percent to 40 Percent RAP
Asphalt Pavement Magazine - May/June 2017 - 35
Asphalt Pavement Magazine - May/June 2017 - 36
Asphalt Pavement Magazine - May/June 2017 - 37
Asphalt Pavement Magazine - May/June 2017 - 38
Asphalt Pavement Magazine - May/June 2017 - 39
Asphalt Pavement Magazine - May/June 2017 - 40
Asphalt Pavement Magazine - May/June 2017 - 41
Asphalt Pavement Magazine - May/June 2017 - 42
Asphalt Pavement Magazine - May/June 2017 - 43
Asphalt Pavement Magazine - May/June 2017 - 44
Asphalt Pavement Magazine - May/June 2017 - 45
Asphalt Pavement Magazine - May/June 2017 - One Secret to High Quality Pavements
Asphalt Pavement Magazine - May/June 2017 - 47
Asphalt Pavement Magazine - May/June 2017 - 48
Asphalt Pavement Magazine - May/June 2017 - 49
Asphalt Pavement Magazine - May/June 2017 - 50
Asphalt Pavement Magazine - May/June 2017 - 51
Asphalt Pavement Magazine - May/June 2017 - Industry Calendar
Asphalt Pavement Magazine - May/June 2017 - 53
Asphalt Pavement Magazine - May/June 2017 - 54
Asphalt Pavement Magazine - May/June 2017 - Index of Advertisers/Advertisers.com
Asphalt Pavement Magazine - May/June 2017 - 56
Asphalt Pavement Magazine - May/June 2017 - 57
Asphalt Pavement Magazine - May/June 2017 - 58
Asphalt Pavement Magazine - May/June 2017 - cover3
Asphalt Pavement Magazine - May/June 2017 - cover4
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