All in a Night's Work

Four pumps placed the concrete, starting in the center and moving out to all four outside corners of the wall. Thermocouples were embedded to continuously monitor core temperatures.

Measuring 168,939 cubic feet and holding more than 800 tons of steel reinforcement, the concrete slab at the Chippewa Falls, Wis., sand plant will support 12 silos, each 70 feet high and 48 feet in diameter.

Ready-mix trucks from a variety of producers supplied concrete.

A special type of sand is mined in the town of Howard, Wis., which will be processed at the Chippewa Falls plant. Called frac sand, it helps energy companies extract more oil and natural gas.

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