Urban village demolition waste turned into 3D printed street furniture
Bentu Design uses additive manufacturing and recycled cementitious composites to close the loop on construction demolition debris
A research-driven project called Inorganic Growth has converted construction waste sourced from demolished urban villages into 3D printed street furniture. The initiative, from studio Bentu Design, combined material reprocessing with digital fabrication to transform discarded concrete, brick rubble, and mortar into printable cementitious composites.
The developed material contained up to 85% recycled solid waste by composition, and construction debris was treated through a two-stage crushing process — primary jaw crushing followed by secondary impact crushing — with multi-layer vibrating screening separating aggregates by particle size.
A mobile processing unit installed directly at demolition sites integrated crushing, sorting, material preparation, and printing into a continuous on-site workflow. Bentu Design reported that this localized approach reduced transportation-related carbon emissions by approximately 70% and achieved a material utilization rate of 92%.
Compared to conventional concrete prefabrication or metal fabrication, the studio claimed the process reduced carbon emissions by an estimated 65–80%. Intelligent slicing algorithms further lowered material consumption by an average of 40% without compromising structural performance.
“Recycling construction waste reduces the land consumption for landfilling of construction waste,” the studio stated. “The precise material control of 3D printing avoids the material waste of traditional manufacturing. After the product is used up, its material can be crushed and remanufactured again, forming a closed loop of resource recycling.”
Photographic documentation of demolished sites was processed through image-analysis algorithms to extract representative color values from the source materials. Brick powder contributed iron-red tones, concrete fines produced neutral grays, and crushed ceramic fragments introduced blue-green variations.
Using a dual-print head system based on Fused Deposition Modeling (FDM), a dynamic gradient control system produced calibrated chromatic transitions along the vertical axis, rendering stratified surface patterns without additional surface treatments.
