Active Rheology Control of Concrete Using Encapsulated Accelerator as Responsive Additives for Concrete 3D Printing

Paper

Kanagasuntharam, Sasithar, Ramakrishnan, Sayanthan and Sanjayan, Jay. 2024. "Active Rheology Control of Concrete Using Encapsulated Accelerator as Responsive Additives for Concrete 3D Printing." 4th RILEM International Conference on Concrete and Digital Fabrication. Munich, Germany 04 - 06 Sep 2024 Germany. Springer. https://doi.org/10.1007/978-3-031-70031-6_29
Paper/Presentation Title

Active Rheology Control of Concrete Using Encapsulated Accelerator as Responsive Additives for Concrete 3D Printing

Presentation TypePaper
AuthorsKanagasuntharam, Sasithar, Ramakrishnan, Sayanthan and Sanjayan, Jay
Journal or Proceedings TitleProceedings of the 4th RILEM International Conference on Concrete and Digital Fabrication
Journal Citation53, pp. 244-251
Number of Pages8
Year2024
PublisherSpringer
Place of PublicationGermany
Digital Object Identifier (DOI)https://doi.org/10.1007/978-3-031-70031-6_29
Web Address (URL) of Paperhttps://link.springer.com/chapter/10.1007/978-3-031-70031-6_29
Web Address (URL) of Conference Proceedingshttps://link.springer.com/book/10.1007/978-3-031-70031-6
Conference/Event4th RILEM International Conference on Concrete and Digital Fabrication
Event Details
4th RILEM International Conference on Concrete and Digital Fabrication
Delivery
In person
Event Date
04 to end of 06 Sep 2024
Event Location
Munich, Germany
Event Web Address (URL)
AbstractThis paper presents a new technology of on-demand delivery of set accelerators in printable concrete to meet the conflicting rheological requirements in 3D concrete printing (3DCP) . The on-demand delivery is achieved by encapsulating the set accelerators with thermally responsive polymers and mixing the encapsulated accelerators in the initial mixing followed by print head activation using heating to release the accelerators from the capsules. Various encapsulation methods including the gelatine capsules and phase change material (PCM) based capsule and accelerators including shotcrete accelerators, NaOH and Na2SiO3 were investigated. It was found that all encapsulation methods showed excellent pumpability properties before print head activation. On the other hand, the static yield stress (SYS) of printable mixes were significantly enhanced after the print head activation with different set-accelerators resulting in different degree of enhancement. For instance, the SYS at 25 min was increased by 4 times, 4 times and 9 times for the shotcrete accelerator, NaOH and Na2SiO3 respectively. On the contrary, the mechanical properties of the printed concrete were affected differently by the proposed encapsulated accelerator technologies. The corresponding 7-day compressive strength was reduced by 31% and 2% in perpendicular direction for NaOH accelerator and Na2SiO3 accelerator respectively. In contrast, the 7-day strength of the mixture with liquid set accelerator were increased by 26% in perpendicular direction. Finally, a brief discussion on the development of a prototype print head for the proposed method and large-scale print validation was presented.
KeywordsActive rheology control; concrete 3D printing; rheology; Encapsulated accelerator; set-on-demand
Contains Sensitive ContentDoes not contain sensitive content
ANZSRC Field of Research 2020400505. Construction materials
Public Notes

The accessible file is the accepted version of the paper. Please refer to the URL for the published version.

Byline AffiliationsSwinburne University of Technology
University of Southern Queensland
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