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Turning Waste Into Walls with Additive Manufacturing

May 31, 2023

Digital Building Technologies (DBT), a team at ETH Zürich, is revolutionizing construction with their latest innovation: 3D printed foam from recycled waste for lightweight insulated walls. Known as Airlements, this project utilizes large-scale additive manufacturing technology to create customized building components without the need for molds, reducing costs and resource consumption.

Turning Waste Into Walls with Additive Manufacturing
Trash into treasure. (Image Credit: Patrick Bedarf and Hyuk Sung Kwon)

DBT leverages a cement-free mineral foam by FenX, which has a lower carbon footprint compared to traditional concrete or plastic foams. This versatile material can be manipulated to increase density and porosity, enhancing insulation and structural strength without additional resources. Moreover, since only one material is used, the 3D-printed components can be easily reused or recycled in the future, promoting sustainability.

Airlements comprises four 3D printed foam components, each weighing approximately 25 kilograms, allowing for easy assembly by a single person. The printing process takes less than an hour per component, followed by a week of controlled hardening in the fabrication lab. With temperature and humidity carefully regulated, no energy-intensive processing is required—a significant advancement over previous experiments with cement-free mineral foams.

Airlements process illustration
Airlements process illustration. (Image Credit: Patrick Bedarf and Hyuk Sung Kwon)

The hollow core of Airlements can be filled with mineral foam, creating a monolithic system that accommodates reinforcing materials or infrastructural installations, expanding its applications. Moving forward, DBT aims to enhance Airlements’ load-bearing capacity and improve the precision of their additive manufacturing technology.

With its focus on efficiency, sustainability, and versatility, DBT’s 3D printed recycled waste technology has the potential to transform the construction industry by offering cost-effective and environmentally friendly solutions for insulated walls and beyond.

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About the author | Phillip Keane
Phillip is an aerospace engineer from UK. He is a graduate of Coventry University (UK), International Space University (France) and Nanyang Technological University (Singapore), where he studied Advanced Manufacturing at the Singapore Centre for 3D Printing.
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