Texas Asphalt - Spring 2018 - 34

feature

RAS
DONE
RIGHT
Incorporating
RAS into Your
Sustainability
Toolkit

By Ronald Becker,
Atascosa Recycling

R

ecycling is one way of reducing
environmental impact and let's
face it, "green" is a good thing for
business, too. Adding a recycled
product into the manufacturing process can
pay huge dividends to the environment and
the bottom line. A good example is the
recycled asphalt shingle (RAS). According
to the Federal Highway Administration, we
generate about 10 million metric tons of
tear-off asphalt shingle waste per year, a
figure that has remained constant for the
last 20 years. While some of it gets recycled,
the majority ends up in local landfills where
it can take up to 300 years to decompose.
As an industry, we can have an impact on
these statistics. Because an asphalt shingle
contains valuable recoverable materials that
are beneficial to the production of hot mix
asphalt (HMA), we can take advantage of the
resources and energy that go into making

34 texasasphalt.org

roofing shingles. Rather than allowing
tear-off asphalt shingle waste to be disposed
of, we can put it to work. The asphalt paving
industry has emerged a leader in developing
sustainable practices, and education and
proper application of recycled products is
the key to maintaining that lead.

RAS, ECONOMICS,
AND THE ENVIRONMENT
Under the direction of Texas Department
of Transportation (TxDOT), Texas A&M
University conducted extensive testing on the use of RAS in the making of
asphalt. Their findings allowed TxDOT to
adopt asphalt mix designs including RAS for
state highway use. The report singled out
many attributes for use of RAS in addition
to the obvious environmental benefits.
These attributes include a reduction in
the cost of shingle disposal, a reduction
in the quantities of virgin asphalt used
due to binder replacement, and the added
benefits of useful aggregates and fibers.

The largest cost associated with asphalt
is the binder. We often think of oil as
cheap, but how are we measuring the
cost? Sour crude for asphalt binder is
imported, refined, and then transported
from coastal refineries. Asphalt binder
is a long way from the point of origin.
Processed RAS has recoverable binder
content between 18-20 percent potentially
yielding an average of 400 lbs. per ton of
binder. Introducing RAS at this point of the
process can significantly reduce the amount
of virgin asphalt binder required, while also
minimizing shingle waste to the landfill.
Shingles also contains useful quantities of void filling fibers and aggregates.
The composition typically is 25-30 percent
asphalt binder, 40-60 percent hard aggregates, 5-15 percent fiber and quantities
of sand from the manufacturing process.
Combined with the asphalt binder, the
high-quality granules used on the shingles and the fibers in the shingle mat are
desirable for producing new asphalt for
construction. If all asphalt manufacturers
in the country used just three percent RAS
in their mix designs, all shingle waste could
be eliminated.
The impact of recycling shingles is
more than just keeping the environment
clean. Economically, roofing companies
benefit with a substantially lower tipping
fee than at the landfill. The availability
of shingle recycling centers also reduces
illegal dumping, which saves on expensive
cleanup costs.
Shingle recycling is a highly regulated
and challenging business. When done


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Table of Contents for the Digital Edition of Texas Asphalt - Spring 2018

President’s Message
Notes from the Road
Associate Member Forum
The Major’s Perspective
2017 Annual Membership Meeting: Frost in Austin
2017 Technician of the Year Awards
Congratulations Karen, You Will Be Missed!
Bringing Back Recycle: Using a Balanced Approach to Designing Mixes
Reflecting On the Future of RAP
RAS Done Right
What OSHA’s Ruling for Crystalline Silica Exposure Means to You
Trout Trucking Company, Inc.
History
Calendar of Events
New Members
Products & Services Marketplace
Business Card Exchange
Advertisers Index
Texas Asphalt - Spring 2018 - Intro
Texas Asphalt - Spring 2018 - cover1
Texas Asphalt - Spring 2018 - cover2
Texas Asphalt - Spring 2018 - 3
Texas Asphalt - Spring 2018 - 4
Texas Asphalt - Spring 2018 - 5
Texas Asphalt - Spring 2018 - 6
Texas Asphalt - Spring 2018 - President’s Message
Texas Asphalt - Spring 2018 - 8
Texas Asphalt - Spring 2018 - Notes from the Road
Texas Asphalt - Spring 2018 - 10
Texas Asphalt - Spring 2018 - Associate Member Forum
Texas Asphalt - Spring 2018 - 12
Texas Asphalt - Spring 2018 - The Major’s Perspective
Texas Asphalt - Spring 2018 - 2017 Annual Membership Meeting: Frost in Austin
Texas Asphalt - Spring 2018 - 15
Texas Asphalt - Spring 2018 - 16
Texas Asphalt - Spring 2018 - 17
Texas Asphalt - Spring 2018 - 18
Texas Asphalt - Spring 2018 - 19
Texas Asphalt - Spring 2018 - 2017 Technician of the Year Awards
Texas Asphalt - Spring 2018 - 21
Texas Asphalt - Spring 2018 - Congratulations Karen, You Will Be Missed!
Texas Asphalt - Spring 2018 - 23
Texas Asphalt - Spring 2018 - 24
Texas Asphalt - Spring 2018 - Bringing Back Recycle: Using a Balanced Approach to Designing Mixes
Texas Asphalt - Spring 2018 - 26
Texas Asphalt - Spring 2018 - 27
Texas Asphalt - Spring 2018 - 28
Texas Asphalt - Spring 2018 - 29
Texas Asphalt - Spring 2018 - 30
Texas Asphalt - Spring 2018 - Reflecting On the Future of RAP
Texas Asphalt - Spring 2018 - 32
Texas Asphalt - Spring 2018 - 33
Texas Asphalt - Spring 2018 - RAS Done Right
Texas Asphalt - Spring 2018 - 35
Texas Asphalt - Spring 2018 - What OSHA’s Ruling for Crystalline Silica Exposure Means to You
Texas Asphalt - Spring 2018 - 37
Texas Asphalt - Spring 2018 - 38
Texas Asphalt - Spring 2018 - Trout Trucking Company, Inc.
Texas Asphalt - Spring 2018 - 40
Texas Asphalt - Spring 2018 - History
Texas Asphalt - Spring 2018 - 42
Texas Asphalt - Spring 2018 - Calendar of Events
Texas Asphalt - Spring 2018 - New Members
Texas Asphalt - Spring 2018 - Products & Services Marketplace
Texas Asphalt - Spring 2018 - 46
Texas Asphalt - Spring 2018 - 47
Texas Asphalt - Spring 2018 - Business Card Exchange
Texas Asphalt - Spring 2018 - Advertisers Index
Texas Asphalt - Spring 2018 - 50
Texas Asphalt - Spring 2018 - cover3
Texas Asphalt - Spring 2018 - cover4
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