Free Deposition Printing for Space Truss Structures

Romain Duballet (1) , Romain Mesnil (1) , Nicolas Ducoulombier (1) , Paul Carneau (1) , Leo Demont (1) , Mahan Motamedi (1) , Olivier Baverel (1) , Jean-François Caron (1) , Justin Dirrenberger (2)

1 NAVIER UMR 8205 - Laboratoire Navier
2 PIMM - Laboratoire Procédés et Ingénierie en Mécanique et Matériaux

This paper proposes a specific extrusion method for 3D printing of mortar called free deposition by the authors. It consists in letting a fine mortar flow through a moving nozzle above a support, here EPS foam. The aim is to obtain a regular lace, thus to avoid instability phenomena like coiling, and ensure a regular diameter, without stretching the lace. A rheological characterisation is proposed and is experimentally tested. This work takes place in the context of the building of space trusses in 3D printed concrete thanks to progressively assembled EPS foam blocks acting as support.

Mots clés: Digital Fabrication; concrete printing

Domaines: Mécanique [physics.med-ph]

Romain Duballet, Romain Mesnil, Nicolas Ducoulombier, Paul Carneau, Leo Demont, et al.. Free Deposition Printing for Space Truss Structures. Freek P. Bos; Sandra S. Lucas; Rob J.M. Wolfs; Theo A.M. Salet. Second RILEM International Conference on Concrete and Digital Fabrication, 28, Springer, pp.873-882, 2020, RILEM Bookseries, 978-3-030-49915-0. ⟨10.1007/978-3-030-49916-7_85⟩. ⟨hal-03026585⟩