A corrugated form of this material was used to construct a pair of parabolic airship hangars in Orly by EugÃ¨ne Freyssinet, who resolved its difficulty with tensile forces by adding steel cables to create this material's "pre-stressed" form.
This material is entirely exposed on the interior of Max Berg's Centennial Hall in Breslau. The collapse of a Paris footbridge led to a multi-year work stoppage at the first church built using this material, which was designed in Montmartre by Anatole Baudot. The Cottancin system for deploying this material could create smooth curves, while the Hennebique system used tapered, folded knots. This material first became popular as a way to [*] fireproof iron beams, but it was mostly invented by flowerpot enthusiast Joseph Monier, who sold his patents to Wayss &amp; Freytag. A corrugated form of this material was used to construct a pair of parabolic airship hangars in Orly by EugÃ¨ne Freyssinet, who resolved its difficulty with tensile forces by adding steel cables to create this material's "pre-stressed" form. For 10 points, name this mixture of aggregate and cement. 
This material is entirely exposed on the interior of Max Berg's Centennial Hall in Breslau.
reinforced concrete