Buildability of geopolymer concrete for 3D printing with microwave heating

Paper

Muthukrishnan, Shravan, Ramakrishnan, Sayanthan and Sanjayan, Jay. 2020. "Buildability of geopolymer concrete for 3D printing with microwave heating." 2nd RILEM International Conference on Concrete and Digital Fabrication. 06 - 09 Jul 2020 Springer. https://doi.org/10.1007/978-3-030-49916-7_90
Paper/Presentation Title

Buildability of geopolymer concrete for 3D printing with microwave heating

Presentation TypePaper
AuthorsMuthukrishnan, Shravan, Ramakrishnan, Sayanthan and Sanjayan, Jay
Journal or Proceedings TitleProceedings of the 2nd RILEM International Conference on Concrete and Digital Fabrication
Journal Citation28, pp. 926-935
Number of Pages10
Year2020
PublisherSpringer
ISBN9783030499181
9783030499167
9783030499150
Digital Object Identifier (DOI)https://doi.org/10.1007/978-3-030-49916-7_90
Web Address (URL) of Paperhttps://link.springer.com/chapter/10.1007/978-3-030-49916-7_90
Web Address (URL) of Conference Proceedingshttps://link.springer.com/book/10.1007/978-3-030-49916-7
Conference/Event2nd RILEM International Conference on Concrete and Digital Fabrication
Event Details
2nd RILEM International Conference on Concrete and Digital Fabrication
Delivery
Online
Event Date
06 to end of 09 Jul 2020
Abstract

A novel application of microwave heating was investigated to attain on-demand setting of concrete for the improvement in buildability of 3D printable geopolymer concrete. An integrated microwave heating facility at the nozzle head was replicated using laboratory experiments to understand its effect on the structural build-up of printed filaments. Different microwave heating durations of 5, 10 and 20 s were studied, and the fresh and hardened properties were compared with control specimen (without microwaving). At optimised heating, the interlayer bond strength was found to be increased by 127% and 122% at 7 and 28 days respectively. Furthermore, structural recovery of material after extrusion that governs its buildability, showed a tremendous improvement at optimum heating period. Control specimens could only recover up to 32% of the initial viscosity, whereas addition of microwave heating for 10 s enhanced the viscosity recovery to more than 70%. Effect of microwave heating on cement based concrete 3D printing was also studied to assess the robustness of this technique. Outcomes from this study proposes a novel approach of applying microwave heating to construction 3D printing to achieve “set-on-demand” printable concrete. This study provides a starting point to develop new generation of print head to combat issues faced by current 3D printing practices.

KeywordsConstruction 3D printing; Set-on-demand concrete; Geopolymer concret; Microwave heating; Buildability
Contains Sensitive ContentDoes not contain sensitive content
ANZSRC Field of Research 2020400505. Construction materials
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SeriesRILEM Bookseries
Byline AffiliationsSwinburne University of Technology
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