Sustainability

 ENVIRONMENTAL FACTS

#11

The U.S. recycles about 2 million ton of plastic a year while recycling and reusing over 60 million tons of asphalt.

Plus, plastic recycling alters the chemical structure, so many plastics become different types of products once recycled. Roads, on the other hand, are reusable and renewable infinitely.

#30

A livable future balances three key societal goals: vibrant communities, vital economies, and sustainable environments.

Sustainable transportation is essential, and asphalt plays a fundamental role.

#45

Crushed concrete is rarely used as aggregate in asphalt pavement.

Reclaimed asphalt can be recycled/reused as new asphalt. Reclaimed concrete can be recycled into road base material but,  because  it is highly absorptive, it is not desirable as aggregate for asphalt pavements. When being reused in asphalt pavement, the asphalt cement in reclaimed asphalt is reactivated so that it becomes part of the “glue” of the new pavement. But putting reclaimed concrete into a new asphalt pavement would be counter-productive. The reclaimed concrete is highly absorptive, so it would soak up the new asphalt cement instead of just being coated by it. This would be a waste of precious natural resources.

#46

A livable community relies on a healthy local economy and good jobs.

The quality of roads and other infrastructure literally provides a foundation for economic activity.

#63

Asphalt is 100% renewable, but reclaimed concrete is just porous rock.

Reclaimed concrete can only be repurposed; in other words, it is just rock, because the Portland cement concrete in it can never be reactivated.

#67

Asphalt isn’t just for single-driver cars.

Buses drive on asphalt. Asphalt bike paths and trails provide smooth, safe surfaces while protecting fragile ecosystems. Asphalt pavements are used worldwide for reservoirs, landfill caps, and fish hatcheries. More…

104

With porous asphalt, deicing chemicals can be reduced by 75 to 100 percent.

Researchers in New Hampshire observed side-by-side asphalt parking lots, one porous and one conventional. They found that with only 0 to 25 percent of the salt, the snow and ice cover on the porous asphalt was the same as on the conventional dense-graded asphalt. This reduction was achieved without compromising braking distance or increasing the chance of pedestrians slipping and falling. In a number of cases, it has been reported that no deicing chemicals are needed, and plowing alone is sufficient to remove snow from the paved surface.

109

Porous asphalt is an environmentally friendly tool for stormwater management.

Porous asphalt pavements allow for land development plans that are more thoughtful, harmonious with natural processes, and sustainable. They conserve water, reduce runoff, promote infiltration which cleanses stormwater, replenish aquifers, and protect streams.

110

Constructing porous asphalt pavements is straightforward.

Any qualified asphalt pavement contractor can construct such pavements and virtually any asphalt plant can produce the material. No certification is required.

111

One of the earliest examples of a porous asphalt pavement is the parking lot for the visitor center at Walden Pond State Reservation in Massachusetts, which was constructed in 1977.

This parking lot has received very little maintenance in its three and a half decades of us, and it carries heavy traffic including buses, yet it still functions as a porous pavement structure.

112

Porous asphalt pavement is an economically sound choice.

On a tonnage basis, the asphalt cost is approximately the same as the cost of conventional asphalt. The underlying stone bed is usually more expensive than a conventional  sub-base because of the depth of stone used, but this cost difference is generally offset by the significant reduction in stormwater pipes and inlets.

113

Often it is possible to route runoff from roofs and roads into the stone recharge bed of a porous parking lot.

By directing runoff into the recharge bed under the parking lot, the builder can reduce both costs and environmental impact for the entire project.

114

The Pringle Creek community in Oregon uses porous asphalt streets, so its roads are part of its stormwater management system.

The stormwater management system includes porous streets, vegetated bioswales, tree preservation, and open-space conservation. Together, these tools direct 90 percent of the rainwater that falls on the community back into the aquifer.

128

Asphalt is the quiet pavement.

Quiet pavement technologies include open-graded surfaces, fine-graded surfaces, and two-layer open-graded pavements. Noise reductions of 3 to 10 decibels are common.

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