Set on demand geopolymer using print head mixing for 3D concrete printing
Article
Muthukrishnan, Shravan, Ramakrishnan, Sayanthan and Sanjayan, Jay. 2022. "Set on demand geopolymer using print head mixing for 3D concrete printing." Cement and Concrete Composites. 128. https://doi.org/10.1016/j.cemconcomp.2022.104451
Article Title | Set on demand geopolymer using print head mixing for 3D concrete printing |
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ERA Journal ID | 21082 |
Article Category | Article |
Authors | Muthukrishnan, Shravan, Ramakrishnan, Sayanthan and Sanjayan, Jay |
Journal Title | Cement and Concrete Composites |
Journal Citation | 128 |
Article Number | 104451 |
Number of Pages | 14 |
Year | 2022 |
Publisher | Elsevier |
Place of Publication | United Kingdom |
ISSN | 0958-9465 |
1873-393X | |
Digital Object Identifier (DOI) | https://doi.org/10.1016/j.cemconcomp.2022.104451 |
Web Address (URL) | https://www.sciencedirect.com/science/article/pii/S0958946522000464 |
Abstract | The concept of set-on-demand in concrete with an intervention at the print head could be used to accelerate the concrete's yield strength development after placement without significantly affecting the pumpability and extrudability. This study demonstrates the proof-of-concept of the set-on-demand approach in geopolymer concrete, where the initial mixing of reactive components (i.e., activators + binder) is conducted at the print head. The study first analyses the feasibility of the proposed concept by assessing the yield strength development rates of fresh concrete for varying mix design parameters. With a suitable mix design is chosen, a modular in-line dynamic mixing equipment was utilised to assess the effect of various mixing regimes and operating parameters (shearing histories) on the yield strength development rates. The results demonstrated that the in-line mixing process of reactive components for a short duration (i.e. 45 secs) would be sufficient to achieve a yield strength development rate of 800 Pa/s after placement, making it suitable for the print-head mixing process. The rapid setting of geopolymer concrete was utilised to print out-of-plane structures (simply supported beams) as a proof of concept. |
Keywords | Digital fabrication; Alkali activated materials (AAM) ; Additive manufacturing ; Buildability; Eco-friendly concrete ; Active stiffening control (ASC) |
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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