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From:
http://www.nachi.org/history-of-concrete.htm
“The History of Concrete” by Nick Gromicko and Kenton Shepard
Nick Gromicko and Kenton Shepard write:
“Expertise in building with reinforced concrete eventually allowed the development of a new way of building with concrete; the thin-shell technique involves building structures, such as roofs, with a relatively thin shell of concrete. Domes, arches and compound curves are typically built with this method, since they are naturally strong shapes. In 1930, the Spanish engineer Eduardo Torroja designed a low-rise dome for the market at Algeciras, with a 3½-inch thickness that spanned 150 feet. Steel cables were used to form a tension ring. At about the same time, Italian Pier Luigi Nervi began building hangars for the Italian Air Force, shown in the photo [here].“
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