Page 30 - Demo

30 CPI %u2013 Concrete Plant International | India Edition %u2013 6 | 2025 www.cpi-worldwide.comThe Progress Group from Brixen (Italy) has achieved a technological breakthrough with its specially developed SPI 3D concrete printer (Selective Paste Intrusion). With complex shapes, high precision and sustainable use of resources, the process can offer completely new options for the precast industry. The resort Pareus in Caorle is now the most important reference project to date, impressively demonstrating the possibilities of the technology on a large industrial scale.New dimensions in form and functionThe SPI 3D concrete printer developed in the research and development department adds a flexible tool for architects, engineers and manufacturers to traditional precast element production. Thanks to a layer resolution of just three millimetres, components are produced with a very high level of detail %u2013 from fa%u00e7ades and furniture to customised precast elements. With dimensions of 5.00m long, 2.80 m wide and 1.5 m high, the printer is designed to ensure that transport and further processing remain efficient.SPI technology: Layer by layer to the topThe Selective Paste Intrusion (SPI) process works in a similar way to Selective Laser Sintering (SLS). Whereas in SLS a laser melts the powder, in SPI a print head applies a cement paste made of water and cement to a bed of sand with pinpoint accuracy. The cement hardens the sand mixture at the intended points and thus forms the desired geometry. After each layer, the platform is lowered and a new layer of sand is applied. The loose sand therefore acts as a supporting structure throughout the entire process. Once printing is complete, the material hardens within 24 hours and the excess sand is vacuumed off and completely reused.Symbiosis of aesthetics and functionalityWith the SPI technology, the Progress Group offers completely new design freedom, especially for fa%u00e7ade design. The system combines the advantages of 3D printing with the proven properties of double wall systems. The outer layer is customised using the 3D printing process, offering a high 3D concrete printing offers entirely new possibilities in precast constructionProgress 3D Concrete Printing, 39042 Brixen, ItalyThe sand bed of the 3D concrete printer serves as the basis for the production of various forms and elements.