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Yes, that is a Porsche 911. Yes, that is fresh concrete. No, this is not some uber-powerful aftermarket-tuned car that just liquified the San Francisco pavement underneath – the Porsche was driven into this predicament.

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As anyone who's ever driven through Detroit can tell you, concrete doesn't fix itself. Or at least it doesn't right now. Thanks to research from a graduate student at the University of Rhode Island, that may change in the near future. Michelle Pelletier found that mixing a microencapsulated sodium silicate agent into standard concrete can cause the material to regain up to 26 percent of its original strength after being severely fractured. Those numbers were developed by using a two percent solu

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More widely used in Europe than in America, retractable concrete-reinforced pillars, placed underneath the road, do a much better job than wooden toll arms or even tire-snagging spikes at stopping traffic from getting into restricted areas.

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