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05/22/2012

Stiffer Pavement for Fuel Savings and Sustainability

 
Stiffer pavement options may provide a sustainable and cost-effective solution.

A study released by civil engineers at MIT displays the potential of using stiffer pavements on the nation’s roads. The figures are significant, showing a reduction in fuel consumption of as much as 3% - adding up to about 273 barrels of crude oil per year or $15.6 billion at today’s prices.  It would also reduce CO2 emissions by 46.5 million metric tons per year.

The study is the first to use mathematical modeling rather than roadway experiments to look at the effect of pavement deflection on vehicle fuel consumption across the entire U.S. road network.

By modeling the physical forces at work when a rubber tire rolls over pavement, the study's authors, Professor Franz-Josef Ulm and PhD student Mehdi Akbarian, conclude that because of the way energy is dissipated, the maximum deflection of the load is behind the path of travel. This has the effect of making the tires on the vehicle drive continuously up a slight slope, which increases fuel use.

The deflection under the tires is similar to that of beach sand underfoot: With each step, the foot tamps down the sand from heel to toe, requiring the pedestrian to expend more energy than when walking on a hard surface. On the roadways, even a 1% increase in aggregate fuel consumption leaves a substantial environmental footprint. Stiffer pavements — which can be achieved by improving the material properties or increasing the thickness of the asphalt layers, switching to a concrete layer or asphalt-concrete composite structures, or changing the thickness or composition of the sublayers of the road — would decrease deflection and reduce that footprint.

"We're wasting fuel unnecessarily because pavement design has been based solely on minimizing initial costs more than performance — how well the pavement holds up — when it should also take into account the environmental footprint of pavements based on variations in external conditions," Akbarian says. "We can now include environmental impacts, pavement performance and — eventually — a cost model to optimize pavement design and obtain the lowest cost and lowest environmental impact with the best structural performance."

The researchers say the initial cost outlay for better pavements would quickly pay for itself not just in fuel efficiency and decreased CO2 emissions, but also in reduced maintenance costs.

"There's a misconception that if you want to go green you have to spend more money, but that's not necessarily true," Akbarian says. "Better pavement design over a lifetime would save much more money in fuel costs than the initial cost of improvements. And the state departments of transportation would save money while reducing their environmental footprint over time, because the roads won't deteriorate as quickly."

"This work is not about asphalt versus concrete," Ulm says. "The ultimate goal is to make our nation's infrastructure more sustainable. Our model will help make this possible by giving pavement engineers a tool for including sustainability as a design parameter, just like safety, cost and ride quality."

 

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Rent or buy spot coolers from full-service locations nationwide. On call “24/7”. Primary, supplemental or emergency cooling. Atlas Sales & Rentals, Inc., or call (800) 972-6600.

Click here for more info


Visit our website today to learn about the design flexibility of a Morton building and the endless possibilities of partnering with our designBUILD team.


Wood construction is both cost and energy efficient. Check out Morton Buildings and our designBUILD team online today to discover all the benefits of post-frame construction.


When choosing a metal-clad building for your next construction project, consider Morton Buildings, Inc., and their designBUILD team, we’ll make your dream a reality.

Bluebeam® Revu® simplifies digital facilities document management from design review to leveraging as-builts, maintenance manuals and O&Ms submittals.

Yaskawa drives offer quality performance for air handlers and cooling towers on the roof to secondary chilled water pumps in the basement

We Can Help You Reduce Energy by 30%

Our mission is to help our customers manage their buildings' energy costs, improve reliability, and enhance performance while having a positive impact on the environment.
CLICK HERE to find out how.


 
08/21/2014

The Department of Energy has released two reports which indicate wind turbine installations and efficiency is growing while prices drop. 

08/20/2014

The NHL has partnered with the NRDC to release their first sustainability report. 

08/19/2014

A new battery has been developed that is free of toxic materials and longer lasting than its more expensive competitors.

08/14/2014

A new study shows that emergency communications that don't specify the threat could be doing more harm than good.

08/13/2014

Natural light's benefits to workers extend far beyond the workday.

08/12/2014

Will a "Little Box" change the future of electricity?

08/07/2014

Could your building withstand an F3 tornado repeatedly?

08/06/2014

Make sure your conference room is properly outfitted with a projection system that meets your occupants' needs.

08/04/2014

The update to the Building Energy Quotient program includes more building types and a new methodology to measure "In Operation" buildings.

07/31/2014

Improper lockdown security may leave your building and occupants vulnerable

07/29/2014

Is the American energy policy lagging behind the rest of the world?

07/22/2014

How to keep building occupants safe during the hot season.

07/21/2014

Spaces grow denser as the industry emerges from a slump.

07/18/2014

Study ranks states on fuel and consumption.

07/16/2014

Enhance cleaning practices at your educational facilities.

07/11/2014

Tenants have low tolerance for even one pest sighting, a new survey reveals.

07/10/2014

Battery installations will fuel federal research.

07/03/2014

An ongoing pilot program targets carbon neutrality.

06/27/2014

Potential substitute chemicals boast a low global warming potential.

06/26/2014

Tap into the DOE’s new data stream for renewable energy.

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