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References*<br />

(1) Slate.com, “Paved and Confused,” Aug. 2010<br />

(2) Culturechange.org, “The Problem With Paving,”<br />

1998 Fact Sheet #1<br />

(3) United Nations Environment Programme,<br />

“Decoupling Natural Resource Use and Environmental<br />

Impacts from Economic Growth,” 2011<br />

(4) Life Cycle Climate Impacts of the U.S. Pavement<br />

Network, Holtz and Eighmy, 2000<br />

(5) Pavement Preservation Compendium II,<br />

“Techniques For Making Roads Last,” April 2011<br />

(6) Institue of Environmental Research and Education,<br />

Lifecycle Assessment of GSB-88, September 2011<br />

(7) First International Conference on Pavement<br />

Preservation, Paper 65 – “Energy Usage and Greenhouse<br />

Gas Emissions of Asphalt Preservation Processes for<br />

Asphalt Concrete Pavement,” April 2010<br />

(8) State of Pavement Report, California, 2013<br />

Sustainability<br />

Leadership<br />

Business Process<br />

Culture & Technology<br />

Recycling<br />

The pavement recycling process typically consists<br />

of the following steps:<br />

1. Road base stabilization<br />

2. Blending old pavement millings with a small<br />

amount of rejuvenating emulsion and water (1-5% of<br />

each), via pugmill or blade lay. GSB-Repave® is an<br />

excellent and proven emulsion for this – it blends coarse<br />

and fines into a smooth, malleable finished product.<br />

3. Laying the finished product via blade lay or<br />

paver, watering, and rolling to optimum compaction.<br />

4. Sealing via a rejuvenating chip-seal<br />

emulsion such as PASS®<br />

Sustainability and Pavement Preservation<br />

At ASI, we think about sustainability<br />

in terms of pavement preservation.<br />

Several of our products are both economically<br />

and environmentally friendly –<br />

particularly GSB-88® and GSB-Repave® –<br />

but we will go beyond that here and examine<br />

sustainability in a larger global<br />

context, as follows:<br />

267 times<br />

greater<br />

Summary<br />

Sustainability is an economic and environmental<br />

priority in today’s world, and proper asphalt<br />

preservation represents a significant part of it.<br />

Asphalt pavement comprises nearly 2% of the earth’s<br />

surface, and preserving it wisely can save billions of<br />

dollars every year while also reducing annual global<br />

greenhouse emissions up to 3%.<br />

Affordable and resource-friendly solutions are readily<br />

available; utilizing these products and<br />

processes properly will help achieve the decoupling<br />

of economic growth and environmental decline, and<br />

thereby move the planet forward<br />

more sustainably.<br />

Environment<br />

Health & Safety<br />

Effective recording,<br />

tracking and analytics<br />

for the management<br />

and reduction of<br />

incidents including:<br />

spill, releases,near<br />

misses, and lost<br />

time accidents.<br />

Operatinoal Risk<br />

Management<br />

A framework for<br />

pro-actively identifying,<br />

quantifying, visualizing,<br />

prioritizing and<br />

mitigating risk from<br />

across the enterprise.<br />

Energy<br />

Management<br />

Collect, Visualise,<br />

analyze, and report<br />

energy generation and<br />

use data.<br />

Product<br />

Stewardship<br />

Ensure product<br />

safety and compliance<br />

throughout the supply<br />

chain with effective<br />

traceability and<br />

regulatory<br />

submissions tools.<br />

Carbon<br />

Management<br />

Collect, Visualise,<br />

analyze, and report<br />

carbon and other<br />

GHG data from across<br />

supply chain.<br />

Sustainability<br />

Reporting<br />

Track and report<br />

progress on<br />

sustainability goals<br />

to the market in an<br />

auditable and easily<br />

receptable process.<br />

Plastic<br />

Containers<br />

On a global level, the scale of pavement<br />

recycling is huge. Current worldwide<br />

volumes of recycled asphalt<br />

pavement are (*8):<br />

89 times<br />

greater<br />

Aluminum<br />

Cans<br />

27 times<br />

greater<br />

Glass<br />

Bottles<br />

Recycled Asphalt Pavement<br />

13 times<br />

greater<br />

Newsprint<br />

There is an enormous amount of pavement in the<br />

world, and the quantity is growing every year<br />

Economically & environmentally, it is infinitely<br />

cheaper & better for the planet to maintain<br />

pavement than it is to replace it<br />

Some methods of pavement preservation are<br />

much “greener” and therefore more<br />

sustainable than others<br />

To move forward sustainably on local and global<br />

levels, asphalt pavement simply must<br />

be preserved wisely<br />

© Asphalt Systems, Inc. ®<br />

Salt Lake City, Utah<br />

September 2014<br />

www.asphaltsystemsinc.com<br />

801-972-2757<br />

Inevitably, some pavements are too deteriorated to<br />

maintain and therefore in need of replacement.<br />

In these cases, recycling is the most sustainable<br />

solution, and is also much cheaper than new pavement<br />

(up to 60% less in ASI case studies).<br />

From an environmental standpoint, the upside is a<br />

significant reduction or elimination of aggregate<br />

mining, refining, transport and<br />

greenhouse gas emissions.<br />

Webster defines Sustainability as<br />

“the ability to continue a defined behavior indefinitely,” and<br />

“the endurance of systems and processes.” Traditionally, it has<br />

been a term used mainly in connection with effort and<br />

endurance – work, sports, food (“sustenance”), lasting<br />

relationships, and so on. Today, however, sustainability is more<br />

often used in the context of environmental concerns; Wikipedia<br />

explains it as “the quality of not being harmful to the<br />

environment or depleting natural resources, and thereby<br />

supporting long-term ecological balance.”<br />

World<br />

Pavement Numbers<br />

In the overall picture of global resources,<br />

pavement is a huge component and continues to<br />

grow. There are nearly 3-million miles of paved<br />

roads in the U.S. alone - enough to circle the earth<br />

120 times at the equator (*1). Total U.S. farmland<br />

is approximately 80,000 square miles, while<br />

pavement (including parking lots and airfields)<br />

is approximately 61,000 square miles. China and<br />

India are close behind and growing quickly;<br />

globally, we will soon exceed 12-million miles<br />

of paved roads. Each additional car requires an<br />

average of .18 paved acres (road & parking),<br />

meaning that five cars require an additional<br />

football field of pavement (*2).<br />

The math and global repercussions of these<br />

numbers quickly become staggering. And all of us<br />

in the pavement industry – engineers, contractors,<br />

commissioners, street superintendents, politicians,<br />

suppliers – are stewards of this resource, meaning<br />

we are ultimately responsible for how to best<br />

handle it sustainably.<br />

“Decoupling”<br />

Economy & Environment<br />

Historically, there has been a close correlation between<br />

economic growth and environmental degradation: as<br />

communities grow, the environment declines (*3).<br />

For sustainability, the challenge we face is to decouple<br />

these trends; in other words, an economy should be<br />

able to sustain GDP growth without incurring<br />

corresponding increases in environmental pressure.<br />

Utilizing optimal pavement preservation strategies is<br />

an important part of this process.<br />

The reality is that pavements pose a sustainability<br />

challenge. Their construction and maintenance<br />

consumes large quantities of non-renewable materials,<br />

while also creating significant energy and environmental<br />

impacts. In the U.S. alone, over 350 million tons of<br />

raw materials go into the construction, rehabilitation,<br />

and maintenance of pavements annually (*4).<br />

Maintenance<br />

Considerations<br />

“Environmentally friendly” can often mean<br />

“more expensive,” but that is not the case with pavement<br />

preservation options. Economically,<br />

over a pavement’s 20-30 year lifespan, it is<br />

literally ten-times cheaper to maintain existing asphalt<br />

than to replace it (*5).<br />

And environmentally, enormous resources are saved:<br />

studies have shown that if all pavements were properly<br />

maintained rather than repaved, global CO2 emissions<br />

could be reduced by over one billion metric tons per<br />

year, which equals an annual 3% reduction in global<br />

greenhouse gas emissions (*6).<br />

PCI<br />

100 Excellent<br />

Good<br />

Fair<br />

Poor<br />

20 VeryPoor<br />

40% Drop in Quality<br />

75% of life<br />

40% Drop in Quality<br />

Spending $1 on<br />

preservation here...<br />

20% of life<br />

Failed<br />

0 5 10 15 20<br />

Eliminates or<br />

delays spending<br />

$6 to $10 on<br />

rehabilitation or<br />

reconstruction<br />

here.<br />

Naturally, some pavement preservation products are<br />

“greener” and therefore more sustainable than others.<br />

Water-based emulsions are widely recognized as a better<br />

environmental choice than fuel-based cutbacks. Here at ASI,<br />

our GSB-88® sealer/binder/rejuvenator emulsion represents<br />

a very economical, versatile, and<br />

environmentally friendly option – plus it is the<br />

only industry product to receive an Environmental<br />

Product Declaration as well as Green Circle Certification.<br />

Even larger sustainability differences can be found in<br />

various pavement preservation<br />

methods, shown in the chart below.<br />

The chart illustrates two main considerations: a)<br />

products that use lower amounts of asphalt per<br />

unit area require the least amounts of energy and also<br />

emit less ghg; b) products having the lowest<br />

quantity of material applied to the pavement per unit area<br />

utilize less energy - because less material<br />

needs to be produced, processed,<br />

transported and installed. (*7)<br />

Annualized Energy Consumption & Greenhouse<br />

Gas (GHG) Emissions per Type of Treatment:<br />

Method Energy Use GHG<br />

New Asphalt<br />

(2” hot matte)<br />

Chip Sealing<br />

(emulsion @ .40 gal/sq. yd.,<br />

aggregate @ 30 lb/sq. yd.)<br />

Fogsealing<br />

(1:1 emulsion/water ratio,<br />

@ .12 gal/sq. yd.<br />

10,000 BTU/sq. yd. 2.0 lb/sq. yd.<br />

2,000 BTU/sq. yd. .2 lb/sq. yd.<br />

300 BTU/sq. yd.<br />

.03 lb/sq. yd.<br />

Social<br />

Where is<br />

“Sustainability”?<br />

BEARABLE EQUITABLE<br />

SUSTAINABLE<br />

Environmental<br />

Economic<br />

VIABLE<br />

These are significant numbers, and<br />

can represent huge steps towards<br />

“decoupling” and sustainability.

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