Cover page in 3D Printing and Additive Manufacturing
A paper from the collaborative research project of the NCCR on digital fabrication with concrete has been published with a cover page for 3D Printing and Additive Manufacturing. From the PhD of M. Joris Burger (thesis directors Profs. Gramazio and Kohler), the work is funded by the Swiss National Science Foundation sponsored National Centre for Competence in Research on Digital Fabrication.
Abstract
Concrete is a material favored by architects and builders alike due to its high structural strength and its ability to take almost any form. However, to shape concrete structures, heavy-duty formwork is usually necessary to support the fresh concrete while curing. To expand geometrical freedom, three-dimensional (3D) printed concrete formwork has emerged as a field of research. This article presents one possible application, a novel fabrication process that combines large-scale robotic fused deposition modeling 3D printing with simultaneous casting of a fast-hardening, set-on-demand concrete. This fabrication process, known as “Eggshell,” enables the production of nonstandard concrete structures in a material-efficient process. By casting a fast-hardening concrete in a continuous process, lateral pressure exerted by the fresh concrete is kept to a minimum. In this way, a 1.5-mm-thin thermoplastic shell can be used as a formwork, without any additional support. Geometries of different scales are tested in this article to evaluate the feasibility of the Eggshell fabrication process in an architectural context. An array of printing materials are also tested, and several different reinforcement concepts are analyzed. The findings are used to produce a full-scale architectural demonstrator project. This article shows that a wide range of concrete geometries can be produced in a material-efficient fabrication process, paving the way toward mass customization and structural optimization within concrete architecture.
Read the full paper external pagehere:
Joris Burger, Ena Lloret-Fritschi, Fabio Scotto, Thibault Demoulin, Lukas Gebhard, Jaime Mata-Falcón, Fabio Gramazio, Matthias Kohler, and Robert J. Flatt.3D Printing and Additive Manufacturing.Apr 2020.48-59