Concrete is the world’s most-used construction material, and a leading contributor to global warming, producing as much as one-tenth of industry-generated greenhouse-gas emissions. Researchers at MIT claim to have developed cement that reduces emissions by more than half, with the added bonus that that it is a stronger, more durable material. The findings come from the most detailed molecular analysis yet of the complex structure of concrete, which is a mixture of sand, gravel, water, and cement. Cement is made by cooking calcium-rich material, usually limestone, with silica-rich material – typically clay – at temperatures of 1,500 degrees Celsius, yielding… Login to continue

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