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Construction Watch

Thanks to the discovery of substandard concrete—concrete mixed with sea, not river, sand—work on 15 buildings around China has stopped. Included is the Ping'an International Finance Center, a 660-meter (2,165.35 feet) skyscraper that's slated to become China's tallest (and the world's second tallest) when complete in 2015. Probably best that project doesn't proceed with a material that "can corrode steel reinforcements over time and ultimately cause a building to collapse." [Dezeen]