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This could be where the rubber truly hits the road.

Rice University scientists have optimized a process to convert waste from rubber tires into that can, in turn, be used to strengthen concrete.

The environmental benefits of adding graphene to concrete are clear, chemist James Tour said.

"Concrete is the most-produced material in the world, and simply making it produces as much as 9% of the world's carbon dioxide emissions," Tour said. "If we can use less concrete in our roads, buildings and bridges, we can eliminate some of the emissions at the very start."

Recycled waste is already used as a component of Portland cement, but graphene has been proven to strengthen cementitious materials, concrete among them, at the molecular level.

While the majority of the 800 million tires discarded annually are burned for fuel or ground up for other applications, 16% of them wind up in landfills.

"Reclaiming even a fraction of those as graphene will keep millions of tires from reaching landfills," Tour said.

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