Among the structures being built at a mixed-use development in Rock Hill, S.C., is a 820-foot velodrome that used 50 concrete track sections. Ramps at the tracks' ends are at a 45-degree angle. "Not many people in the United States or the world have ever poured concrete like that," said Stephen Turner, director of economic and urban development for the city of Rock Hill. "They had to experiment with different mixtures of concrete; it’s a very, very dry mixture of concrete that they’re pouring because it has to stick to these steep slopes and not run down to the bottom."

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