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Poor quality Chinese concrete could lead to skyscraper collapses

from Wired

A sand scandal is brewing in China, with concerns that low quality concrete has been used in the construction of many of the country's largest buildings — putting them at risk of collapse. The recipe to make concrete is pretty simple — cement, aggregate and water — but the strength of the final batch can vary wildly depending on the kinds of aggregate and cement used and the proportions they're mixed in. Commonly, the aggregate used in many modern building projects consists of crushed gravel or other rock, including sand, and that's the cause of so much distress in the Chinese construction industry at the moment. Inspections by state officials have found raw, unprocessed sea sand in at least 15 buildings under construction in Shenzhen, including a building which, when finished, was set to become China’s tallest. more

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