Iowa State's Aaron Shelman and Owen Steffens look for cracks (Photo: Mike Krapfl/Iowa State)
Grant Schmitz eyes a section of concrete column (Photo: Mike Krapfl/Iowa State)
A conventional steel-column wind turbine (Photo: Patrick Finnegan)
Engineers at Iowa State University think concrete columns could be the key to building taller, higher-powered wind turbines. By making the switch from steel to concrete, it's thought that the upper limit of turbine column height could be raised from 80 m to over 100 m.
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