Effect of alkali reactions on the rheology of one-part 3D printable geopolymer concrete

Article

Muthukrishnan, Shravan, Ramakrishnan, Sayanthan and Sanjayan, Jay. 2021. "Effect of alkali reactions on the rheology of one-part 3D printable geopolymer concrete." Cement and Concrete Composites. 116. https://doi.org/10.1016/j.cemconcomp.2020.103899
Article Title

Effect of alkali reactions on the rheology of one-part 3D printable geopolymer concrete

ERA Journal ID21082
Article CategoryArticle
AuthorsMuthukrishnan, Shravan, Ramakrishnan, Sayanthan and Sanjayan, Jay
Journal TitleCement and Concrete Composites
Journal Citation116
Article Number103899
Number of Pages22
Year2021
PublisherElsevier
Place of PublicationUnited Kingdom
ISSN0958-9465
1873-393X
Digital Object Identifier (DOI)https://doi.org/10.1016/j.cemconcomp.2020.103899
Web Address (URL)https://www.sciencedirect.com/science/article/pii/S0958946520304030
AbstractYield strength development of 3D printable concrete by the early age activation reactions plays a vital role in the printability of geopolymer concrete. This study presents a rheo-chemical approach to investigate the early age strength development due to alkali reactions for the formulation of suitable 3D printable one-part geopolymer concrete. The influence of design parameters, including activator content, thixotropic additive (Magnesium Alumino Silicate -MAS), and retarder (sucrose) dosage, on the rheological properties of concrete were assessed. The shear stresses of geopolymer concrete were measured with the aid of a rotational rheometer for various shearing protocols that represent the major stages of printing operation (pumping, extrusion and building). The measured rheological properties were related to reaction kinetics of geopolymer mixes using FT-IR spectroscopy and calorimetry. The results revealed that, with MAS, activator and sucrose content of 0.75 wt%, 10 wt% and 1.5 wt% of the binder respectively, the formulated one-part geopolymer showcased enhanced printing properties. This is further demonstrated by printing laboratory-scale specimens and evaluating the hardened properties.
Keywords3D concrete printing; One-part geopolymer ; Rheology; Buildability; Reaction kinetics ; Thixotropic additives
Contains Sensitive ContentDoes not contain sensitive content
ANZSRC Field of Research 2020400505. Construction materials
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Byline AffiliationsSwinburne University of Technology
School of Engineering
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