Thin and winding concrete surface on ultra-lightweight formwork
Félix Candela’s shell structures relied on combining hyperbolic paraboloid surfaces (similar to the shape of a Pringles potato chip) to produce reusable formworks made out of straight wooden elements. But new technology allows for a much wider range of complex, curved geometries. With the cable-net and fabric formwork system, expressive, free form concrete surfaces can now be constructed efficiently, without the need for complicated, wasteful and time-consuming molds. In Mexico City, KnitCandela’s thin, double-curved concrete shell with a surface area of almost 50 square meters and weighing more than 5 tons was applied onto a knitted formwork shuttering of only 55 kilograms.
The concrete of the KnitCandela shell is manufactured with Holcim cement, acrylic resins, and admixtures to achieve the adherence requirements. To replace conventional steel reinforcement and minimize cracks on the concrete element, macro synthetic fibers with a rough finish and polypropylene fibers are added.
Designed for a tight construction schedule, restricted space and minimal budget, KnitCandela demonstrates the rapid evolution and adaptation of digital design and fabrication to the challenges faced by the construction industry.
The structure’s overall form was inspired by colorful and fluid forms of traditional Jalisco dresses of Mexico – but the construction process and advanced materials enable complex and free-form geometries of contemporary architecture that are highly optimized in terms of material consumption, energy efficiency, and usability.
"KnitCandela” can be experienced at the Museo Universitario Arte Contemporáneo in Mexico City until March 2019.