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Time Lapse Video Shows 12,000-Cubic-Yard Concrete Pour

It took construction crews 18 hours to pour nearly 12,000 cubic yards of concrete at the site of San Francisco’s Salesforce tower.

November 12, 2015

It took construction crews 18 hours to pour nearly 12,000 cubic yards of concrete at the site of San Francisco’s Salesforce tower, the city’s tallest building, reports Wired.

Trucks delivered the concrete and pumped it into the pit to form a massive concrete slab, 14 feet thick and one acre wide. 

According to Wired, the concrete began as approximately 7,900,000 pounds of cement, 9,000 cubic yards of sand and gravel and 54,000 gallons of water at several mixing plants around the Bay Area. Over the course of 18 hours, 1,300 mixing trucks brought the material to the site in downtown San Francisco. Then, two at a time, they dumped their contents into one of seven concrete  pipes.

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