Rebuilding Upper and Lower Wacker Drive in Chicago, workers place high-performance concrete on a 2,800-square-foot upper deck placement. The white plastic ducts house post-tensioning cables. Specifications call for a 100-year service life. Photos: Joe Nasvik
Rebuilding Upper and Lower Wacker Drive in Chicago, workers place high-performance concrete on a 2,800-square-foot upper deck placement. The white plastic ducts house post-tensioning cables. Specifications call for a 100-year service life. Photos: Joe Nasvik
Post-tensioned construction.

Students at Grand Canyon University are fascinated by the concrete construction going on at their campus, so much so that the campus news decided to explain in more detail what they're watching. They answer questions like:“When did they pour the concrete for that floor?”
“How does it not stick to the wood platforms below it?”
“What is the purpose of that wiring (PT tendons) that the concrete is poured over?”
“How do they get all those concrete columns to be the exact same height?”

The interesting story of a concrete building project from a layman's point of view.

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