Concrete 3D printing of lightweight elements using hollow-core extrusion of filaments

Article

Ramakrishnan, Sayanthan, Muthukrishnan, Shravan, Sanjayan, Jay and Pasupathy, Kirubajiny. 2021. "Concrete 3D printing of lightweight elements using hollow-core extrusion of filaments." Cement and Concrete Composites. 123. https://doi.org/10.1016/j.cemconcomp.2021.104220

Article Title	Concrete 3D printing of lightweight elements using hollow-core extrusion of filaments
ERA Journal ID	21082
Article Category	Article
Authors	Ramakrishnan, Sayanthan, Muthukrishnan, Shravan, Sanjayan, Jay and Pasupathy, Kirubajiny
Journal Title	Cement and Concrete Composites
Journal Citation	123
Article Number	104220
Number of Pages	14
Year	2021
Publisher	Elsevier
Place of Publication	United Kingdom
ISSN	0958-9465
	1873-393X
Digital Object Identifier (DOI)	https://doi.org/10.1016/j.cemconcomp.2021.104220
Web Address (URL)	https://www.sciencedirect.com/science/article/pii/S0958946521002882
Abstract	This paper investigates an approach of 3D printing lightweight concrete elements using extrusion of hollow-core filaments. Two different filament shapes of rectangular hollow shape and U-shape were printed by using customised nozzles. The primary challenge in hollow-core 3D printing is the extrudability and the stability of the overhang of the filament at fresh state. The stability of the overhang was assessed by determining the viscosity recovery rate and yield strength growth rate of the mix with nanoclay as a thixotropic additive. The mix containing 0.2 wt% of nanoclay has shown good extrudability and enhanced stability of the overhang. The hollow-core 3D printed elements have shown a reduced density of 1369.6 kg/m3 and 1701.7 kg/m3, compared to 2114.1 kg/m3 obtained for solid-core printing. The compressive strength and the Modulus of Rupture (MoR) of hollow-core filaments evaluated at different directions reveal a significant strength loss in perpendicular and lateral directions due to the effective bond area reduction between filaments. The thermal performance of 3D printed panels assessed using simulated test room experiments reports that the hollow-core panels have high thermal inertia due to increased insulation capacity. However, the lack of thermal energy storage has resulted in high indoor temperature in these test rooms.
Keywords	Concrete 3D printing; Lightweight structures ; Thermal performance ; Rheology; Hollow-core
Contains Sensitive Content	Does not contain sensitive content
ANZSRC Field of Research 2020	400505. Construction materials
Public Notes	Files associated with this item cannot be displayed due to copyright restrictions.
Byline Affiliations	Swinburne University of Technology

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