From waste to resource using recycled stone in 3D Printed

The environmental impact of conventional construction materials, particularly those reliant on traditional stone extraction and processing methods, is substantial. Key data points highlight carbon emissions from stone extraction, waste generation, energy-intensive processing, transportation-related emissions, and habitat destruction. Construction and mining are critical economic sectors, jointly producing 65% of waste on a European scale (EEA, 2023). Stone waste, a by-product of mining and manufacturing, poses environmental challenges during disposal. In fact, in the stone sector, up to 71% of material becomes waste, with mining waste accounting for 51% and processing waste for 41% of raw production quantity (Italian Trade Agency, 2020, 2021; Montani, 2017). To address this, an innovative approach to design and production process are essential to reintegrate scrap material into the production cycle (Baratta, 2021), enhancing product flexibility and customization. This study explores the potentiality to transforming this waste into a valuable resource through 3D printing, contributing to the circular economy. Successful case studies demonstrate recycled stone waste as a sustainable alternative for 3D-printed architectural elements, reducing greenhouse gas emissions associated with traditional stone extraction and processing also, the transportation. Recent research encourages experimenting with structural and non-structural modular elements, decorative wall cladding, and urban furnishings make with additive manufacturing processes. However, surface finish and mechanical performance of these components need improvement. Furthermore, it is also fundamental evaluating component disposal and transformation prospects, by analysing their recycle potentialities. By analysing component performance achievable with this technology and processing times, we can assess the environmental impact. This research demonstrate that the components make by 3D print maybe become complementary to natural stone elements, recovering 80% of waste material. This could be reduced excavation and pollution. Shifting design paradigms allows creating them from waste, minimizing energy consumption and long-distance transportation.