Pavement Preservation Journal - Summer 2018 - 16

Live Bottom Trailers

Heavy Duty Trailers

Fig. 2: Environmental fingerprint (southeast)

*

Asphalt Distributors

*

*

ChipSpreaders

*

Asphalt Transports
*

E. D. Etnyre & Co.

www.etnyre.com
800-995-2116
email: sales@etnyre.com

16

For both regions assessed, two cape
seal technologies were compared
against a hot mix overlay. For the southeast assessment, the two cape seal technologies featured a ground tire rubber
(GTR) chip seal and a SBR polymer modified emulsion chip seal. The California
(West Coast) assessment featured an
asphalt rubber (AR) chip seal and a SBR
polymer modified emulsion chip seal.
Composition ranges for all alternatives generally reflected average
industry data.
A full energy accounting of the processes was considered, and included the
energy required to produce and apply
each technology, energy required to produce the crumb/ground tire rubber, and
energy associated with transportation
and disposal.
The maximum amount of RAP
(reclaimed asphalt pavement) allowed
in the base case hot mix asphalt overlay was 15 percent for the California
(West Coast) model and 20 percent for
the southeast model.
Various literature sources 2,3 as well as
input from regional producers and trade
associations helped establish the durabilities list below for each alternative:
❍ Asphalt rubber (AR) based cape seal;
California (West Coast): 14 years
❍ Polymer modified cape seal (CRS-2P):
eight years
❍ Ground tire rubber (GTR) cape seal:
eight years
❍ Hot mix overlay (1.5-in. mill and
overlay): 12 years

*

RESULTS
Fig. 1 shows the respective global warming
potential (carbon footprints) for the alternatives considered in the southeast analysis.
The polymer modified emulsion based cape
seal (Cape Seal II) had the lowest carbon
footprint: 20 percent lower than the GTR
chip seal-based cape seal, and 30 percent
lower than the hot mix overlay.
Contributions to CO2 emissions come from
both material use and energy consumption
during manufacturing and transport. The
main contributor to the hot mix overlay was
the large amount of energy required during
the production, storage and application of
the asphalt. The binder contribution to the
global warming potential (GWP) for each
alternative was roughly the same.
For the California (West Coast) assessment the asphalt rubber-based cape seal
had a GWP about 10 percent less than the
polymer modified emulsion based cape
seal. The hot mix asphalt overlay had the
highest global warming contribution.
Expanding beyond the carbon footprint, the relative impact for each
alternative in each environmental category assessed can be seen in Fig. 2, the
environmental fingerprint.
Excluding resource depletion and fresh
water eutrophication, the Cape Seal II

View past issues of the PAVEMENT2/26/18
PRESERVATION
JOURNAL online at www.naylornetwork.com/fpp-nxt
6:27 PM

907242_ED.indd 1

Consistent with U.S. DOT FHWA guidelines, constant dollars and real discount
rates were considered4 for each alternative's initial and future cost impacts.
Both financial and social discount rates
were considered.


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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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