Pavement Preservation Journal - Summer 2018 - 14

Measuring Sustainability of Preservation
and Eco-Efficiency of Cape Seals
BY BRUCE W. UHLMAN, LCACP

P

avement preservation-the systematic scheduling of nonstructural maintenance applications
to protect engineered road pavements and extend their service life-helps
promote better road conditions, increases
safe driving by minimizing surface deterioration and the potential for structural
failure, and is an efficient use of tax dollars.
In many parts of the United States, government and public agencies mandate the
use of eco-efficient asphalt construction
materials that are durable, and aid in the
speed of construction for pavement preservation projects.
However, the challenge facing many
of these agencies and key material
specifiers is how can they decide which
technologies and materials are the most
eco-efficient? On what basis should they
make their comparison, and what metrics truly define the sustainability of road
construction materials?

ECO-EFFICIENCY ANALYSIS
In this article, an eco-efficiency analysis
will be presented that compares the relative
eco-efficiencies of a pavement preservation
technology, namely a cape seal (chip seal
covered with a micro surfacing treatment),
vs. standard road construction practice,
namely a hot mix overlay for roads in two
unique regions of the United States.
Utilizing a regional approach allowed for
modeling of regional variations such as the
chip seal technology, durability and costs.
The analysis considered the environmental
and economic impacts required to maintain
a one-mile stretch of a 12-ft.-wide lane of
road using best engineering practices for
a 40-year lifetime.
Results of the analysis, which have been
third-party verified by NSF International
(www.nsf.org), can be found on NSF's certified products and systems website1.
Though the specific results vary for each
region analyzed, the study shows that cape

seals provide both the lowest life-cycle
cost, while also contributing the least environmental impact when compared to hot
mix overlays.
Cape seals achieve these advantages
because of their ability to maintain desired
road characteristics and performance using
a significantly reduced amount of materials
compared to hot mix overlays.
The report also supports through additional scenario analyses, the continued
emphasis on advancements in hot mix
technologies that reduce application temperatures and increase the usage amount
of recycled asphalt pavement (RAP). These
advances can lead to significant improvements in the overall sustainability of hot
mix overlays.
Finally, the study supports the overall
conclusion that doing preventive maintenance, specifically cape seals, early in a
pavement's life cycle, can cost-effectively
extend the life of the road as well as reduce

Fig. 1: Global Warming Potential (southeast)
14

View past issues of the PAVEMENT PRESERVATION JOURNAL online at www.naylornetwork.com/fpp-nxt


http://www.nsf.org http://www.naylornetwork.com/fpp-nxt

Table of Contents for the Digital Edition of Pavement Preservation Journal - Summer 2018

President’s Message
PPRS Nice 2018: U.S. in Era of Asset Management, Pavement Preservation, Says Aashto’s Wright
Measuring Sustainability of Preservation and Eco-Efficiency of Cape Seals
Dedicated, Consistent Funding for World-Class Preservation Programs
As Loadings Rise, Preservation Data Gathers
‘Green’ Antistrip Offers Option in Pennsylvania
AEMA + ARRA + ISSA = PPRA
Profiles in Preservation: Surprises in Emulsions
Index of Advertisers
Pavement Preservation Journal - Summer 2018 - Intro
Pavement Preservation Journal - Summer 2018 - cover1
Pavement Preservation Journal - Summer 2018 - cover2
Pavement Preservation Journal - Summer 2018 - 3
Pavement Preservation Journal - Summer 2018 - 4
Pavement Preservation Journal - Summer 2018 - 5
Pavement Preservation Journal - Summer 2018 - 6
Pavement Preservation Journal - Summer 2018 - 7
Pavement Preservation Journal - Summer 2018 - 8
Pavement Preservation Journal - Summer 2018 - President’s Message
Pavement Preservation Journal - Summer 2018 - PPRS Nice 2018: U.S. in Era of Asset Management, Pavement Preservation, Says Aashto’s Wright
Pavement Preservation Journal - Summer 2018 - 11
Pavement Preservation Journal - Summer 2018 - 12
Pavement Preservation Journal - Summer 2018 - 13
Pavement Preservation Journal - Summer 2018 - Measuring Sustainability of Preservation and Eco-Efficiency of Cape Seals
Pavement Preservation Journal - Summer 2018 - 15
Pavement Preservation Journal - Summer 2018 - 16
Pavement Preservation Journal - Summer 2018 - 17
Pavement Preservation Journal - Summer 2018 - 18
Pavement Preservation Journal - Summer 2018 - 19
Pavement Preservation Journal - Summer 2018 - 20
Pavement Preservation Journal - Summer 2018 - 21
Pavement Preservation Journal - Summer 2018 - Dedicated, Consistent Funding for World-Class Preservation Programs
Pavement Preservation Journal - Summer 2018 - 23
Pavement Preservation Journal - Summer 2018 - 24
Pavement Preservation Journal - Summer 2018 - As Loadings Rise, Preservation Data Gathers
Pavement Preservation Journal - Summer 2018 - 26
Pavement Preservation Journal - Summer 2018 - ‘Green’ Antistrip Offers Option in Pennsylvania
Pavement Preservation Journal - Summer 2018 - 28
Pavement Preservation Journal - Summer 2018 - 29
Pavement Preservation Journal - Summer 2018 - 30
Pavement Preservation Journal - Summer 2018 - 31
Pavement Preservation Journal - Summer 2018 - AEMA + ARRA + ISSA = PPRA
Pavement Preservation Journal - Summer 2018 - 33
Pavement Preservation Journal - Summer 2018 - 34
Pavement Preservation Journal - Summer 2018 - Profiles in Preservation: Surprises in Emulsions
Pavement Preservation Journal - Summer 2018 - 36
Pavement Preservation Journal - Summer 2018 - Index of Advertisers
Pavement Preservation Journal - Summer 2018 - 38
Pavement Preservation Journal - Summer 2018 - cover3
Pavement Preservation Journal - Summer 2018 - cover4
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