Asphalt Pavement Magazine - May/June 2017 - 40

Making the Jump From 15 Percent to 40 Percent RAP
mix design extensively in the lab,
MassDOT identified a pavement
section in Worcester where the mix
design could be put to real-world use
in a mill and Thinlay™ application.
This gave MassDOT District 3
an opportunity to explore the
GreenDOT sustainability mandate by
increasing RAP use from 15 percent
in a surface course to 40 percent.
For a mill and Thinlay project
using 40 percent RAP, MassDOT
selected an older asphalt pavement
that they stated was in fair
condition, merely in need of
resurfacing. The approximately
3,000 linear feet of the North Service
Road and westbound ramp onto
I-290 in Worcester had seen no
preservation treatments in the past.
"It showed no signs of
deterioration," Berkley agreed.
"There was some oxidation and
some surface cracking... The
purpose of this project is a pavement
preservation instead of a rebuild."

A Thinlay's purpose is not to
fix structural problems, but to
extend an existing pavement's
life, thus the minor cracking
and oxidation could be resolved
with the simple 1-inch mill
and well-designed Thinlay.
Originally, the test section was
going to be included in a MassDOT
district-wide resurfacing contract.
When the budget was expended
prior to completing the work
in mid-2016, the North Service
Road project had to be pushed
to a later date. October 2016 saw
the project come to fruition.

Design and Produce
Mogawer prepared a Superpave
9.5 mm Sustainable Thin
Overlay (SP9.5 STO) mix design,
which can be considered for lift
thicknesses ranging from 0.75
to 1.5 inches (19.0 to 37.5 mm).
The mixture comprises coarse
aggregate, fine aggregate, mineral

40 860976_Editorial.indd
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filler as needed, and a PG64-28
asphalt binder. A maximum of
40 percent RAP incorporates a
rejuvenator at a dosage of 6 percent
by weight of recycled binder.
The draft specification allows
MassDOT District 3 to increase the
amount of RAP it would typically
include in a surface layer.
Montenegro explains: "When
mixes include a higher percentage
of RAP than 25 percent, the
pavement may experience an early
onset of premature cracking due
to the stiffness of the aged binder.
Industry can offset that brittleness
by using a softer binder grade or
rejuvenators. Mogawer was using
the Delta S rejuvenator in the lab;
now it needed to be put to test
in the field. MassDOT District 3
and P.J. Keating opted to use it
for a pavement in Worcester."
The specification used for
the North Service Road mill and
continued on page 42

3/10/17 7:15 PM


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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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