Bentu Design has launched the Inorganic Growth project, transforming construction waste from demolished urban villages into 3D printed street furniture. The initiative uses up to 85% recycled materials to create chairs and stools, reducing carbon emissions through localized production. This approach reintegrates demolition debris into public spaces while preserving material history.
The Inorganic Growth project by Bentu Design addresses urban demolition waste by converting concrete, brick rubble, and mortar from demolished urban villages into printable cementitious composites. Published on March 8, 2026, the research-driven initiative combines material reactivation with digital fabrication to produce functional urban furniture, including a chair named PU and a stool named YOU.
Construction waste undergoes graded crushing with a jaw crusher, followed by impact crushing and multi-layer vibrating screening to separate aggregates. The micro-fine powder fraction, comprising 30-35% of the waste, is mechanically activated and combined with by-products like fly ash, slag powder, and silica fume to form a binding component. Coarse aggregates provide structural support, while nano-suspension modifications reduce water absorption and enhance strength by over 40%. Thixotropic agents and AI-assisted optimization ensure the material's printability and stability.
The furniture's colors draw from urban village materials: iron-red from bricks, cement-gray from concrete, muted greens from weathered surfaces, and blue hues from glazed tiles. Using Fused Deposition Modeling with dual print heads, gradual chromatic transitions are achieved through calibrated pigment distribution, referencing site history without additional treatments.
A mobile processing unit at demolition sites enables crushing, sorting, preparation, and printing, cutting transportation emissions by 70% and achieving 92% material utilization. Compared to traditional methods, the process reduces carbon emissions by 65-80% and material use by 40% via intelligent slicing algorithms. The PU chair measures L715 x W580 x H720 mm, weighs 110 kg, with flexural strength of 12.28 MPa and compressive strength of 106.25 MPa. Water absorption is 1.73% untreated and 0.34% waterproof treated. The YOU stool is L580 x W430 x H540 mm and weighs 70 kg.
Beyond technical aspects, the project positions waste as a carrier of urban memory, creating furniture that serves as infrastructure, material archive, and spatial marker in a regenerative cycle.
