Pavement Preservation Journal - Summer 2018 - 18

Figure 3. Eco-efficiency portfolio base case analysis (southeast)

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18

(polymer modified emulsion-based cape
seal) alternative scored the lowest in each
category, followed by the GTR modified cape
seal and then the hot mix overlay (HMA).
Specific to resource depletion, the HMA
overlay scored the best while the cape seal
technologies had about 30 percent higher
impact. Eutrophication is the process by
which water bodies become enriched in
dissolved nutrients leading to the depletion
of dissolved oxygen ultimately resulting
in harm to aquatic life. The Cape Seal II
technology had the highest impact in fresh
water eutrophication.
Applying weighting factors to the normalized results in Fig. 2, the polymer modified emulsion-based cape seal (Cape Seal II)
scored the lowest in overall environmental
impact, followed by the Cape Seal I (GTR
modified) alternative. The hot mix overlay
technology had the highest overall environmental impact.
For the California (West Coast) analysis,
the asphalt rubber (AR) modified cape seal
technology demonstrated reduced overall
environmental impacts in all environmental
categories, when compared against the
competing technologies. The key factor
influencing the reduced overall environmental impact is the technology's longer
durability and lower resource consumption.
The life-cycle costs for the southeast
cape seal analysis are shown in Table 1.
Material unit costs were provided by material suppliers. The pricing data were recent
(2017) from multiple sources, specific to the
region assessed, and deemed representative
of standard industry pricing. Due to their

identical durability and low material costs,
both cape seal alternatives were the least
expensive alternatives, about 25 percent less
expensive than the HMA overlay.
The life-cycle costs for the California
(West Coast) cape seal analysis also
showed a life-cycle cost advantage for the
cape seal technologies when compared to
the hot mix overlay.
Due to its low material costs and high
durability, the AR-based cape seal was
the least expensive alternative-about
50 percent less expensive than the most
expensive alternative, the HMA overlay. The
Cape Seal II alternative was about 30 percent
less expensive than the HMA overlay.
To determine the relative eco-efficiency
of each alternative, the life-cycle costs and
environmental impact of each alternative
is plotted on the eco-efficiency portfolio.
The portfolio allows for the balancing of
benefits and trade-offs between products
economic value proposition and environmental impact.
As can be seen in Fig. 3, for the southeast analysis, due to their slightly better
performance in both the environmental
and economic assessments, the cape seal
alternatives were the more eco-efficient
alternatives when compared to the
HMA overlay.
Both cape seal technologies scored
an eco-efficiency index score within
10 percent of one another, and thus were
deemed of similar eco-efficiencies. The
Cape Seal II alternative combined the lowest overall environmental impact and lowest life-cycle cost, giving it a 12 percent

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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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