A comparative evaluation of sepiolite and nano-montmorillonite on the rheology of cementitious materials for 3D printing

Aydin, Eylul Mina and Kara, Burhan and Bundur, Zeynep Basaran and Ozyurt, Nilufer and Bebek, Ozkan and Gülgün, Mehmet Ali (2022) A comparative evaluation of sepiolite and nano-montmorillonite on the rheology of cementitious materials for 3D printing. Construction and Building Materials, 350 . ISSN 0950-0618 (Print) 1879-0526 (Online)

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Through the last decade, methods of digital manufacturing of concrete gained a significant interest compared to conventional concrete. The main challenge in additive manufacturing (3D printing) is to design a highly thixotropic cementitious system. This study aims to investigate the use of sepiolite as a rheology modifier as a novel approach to improve the thixotropic behavior and adapt cementitious systems to 3D printing. To understand the influence of sepiolite on rheological properties, a comparative evaluation with nano-montmorillonite was established. The effectiveness of clay addition was also investigated in fly-ash amended cement-based materials. The rheological analysis was done on cement-paste samples containing both clays in terms of their effects on thixotropy, structural build-up, and recovery. A preliminary printability assessment was done with a lab scale printer having a ram extruder. The results show that the incorporation of clays increased the dynamic yield stress and time-dependent evolution of static yield stress. Moreover, the addition of clays improved the thixotropic behavior of cement-based systems, particularly those containing fly-ash. Herein, the sepiolite was found to be more effective compared to nano-montmorillonite in terms of improving thixotropy, structural build-up and recovery. The results showed that use of fly-ash enhances the printability of the mix for the specified extruder and the samples containing 1% nano-montmorillonite or 0.5% sepiolite can be printed. The positive effects of sepiolite were attributed to opposing surface charges of the clay layers and its micro-fibrous microstructure. The findings in this study enabled an in-depth understanding of the rheology and printability of fly-ash amended clay containing printable cement-based mortars.
Item Type: Article
Uncontrolled Keywords: Mineral additives; Rheology; Sepiolite; Thixotropy; Three-dimensional (3D) printing
Divisions: Faculty of Engineering and Natural Sciences
Depositing User: Mehmet Ali Gülgün
Date Deposited: 21 Sep 2022 15:15
Last Modified: 21 Sep 2022 15:15
URI: https://research.sabanciuniv.edu/id/eprint/44489

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