ABSTRACT
This paper explores the potential of stone extraction waste for reuse in construction, specifically through Additive Manufacturing (AM), using 3D Stone Powder Extrusion (3DSPE), supported by robotic systems. Stone extraction produces two primary waste types: solid waste and slurry waste. The latter consists of a mix of stone powder and water produced during cutting, polishing, and other subtraction processes. Traditionally, the slurry is decanted, with the water being recovered, while the stone slurry often discarded in landfills. This study investigates the reuse of marble, granite, and limestone slurry from Portuguese quarries. The slurry was dried, pulverized, and mixed with non-cementitious binders to form a mortar suitable for 3D printing. A robotic system extruded twenty-three mortar pieces, which were subsequently assembled into a column. The findings underscore the environmental benefits of repurposing stone waste, reducing landfill disposal and carbon emissions, and fostering circular economy practices within the stone extraction industry.
