Lightweight concrete slab with optimized load-bearing structure

3D sand printing for formwork manufacturing

Researchers at ETH Zurich have fabricated an 80 m2 lightweight concrete slab at the DFAB House, making it the world’s first full-scale architectural project to use 3D sand printing for its formwork. Just 20 mm thick at its thinnest point, decoratively ribbed and not even half as heavy as a conventional concrete ceiling: with “Smart Slab”, the name says it all. The slab combines the structural strength of concrete with the design freedom of 3D printing.

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