Use of magnesium-silicate-hydrate (M-S-H) cement mixes in 3D printing applications

Panda, B., Sonat, C., Yang, E.-H., Tan, M. J. and Unluer, C. (2021) Use of magnesium-silicate-hydrate (M-S-H) cement mixes in 3D printing applications. Cement and Concrete Composites, 117, 103901. (doi: 10.1016/j.cemconcomp.2020.103901)

Abstract

This study focused on the development of 3D printed building components incorporating MgO–SiO2 binders. The effects of parameters such as MgO/SiO2 and water/binder ratios and superplasticizer dosage were evaluated to produce 3D printable MgO–SiO2 binders. The assessment of rheological and mechanical properties, which led to an optimum mix that satisfied the printability criteria, was supported by microstructural characterization. The best-performing mix in terms of printability and mechanical performance was characterized via x-ray diffraction (XRD), thermogravimetric analysis/derivative thermogravimetry (TG/DTG) and field emission scanning electron microscopy (FESEM) with energy dispersive spectroscopy (EDS). The selected mix exhibited thixotropic behaviour with an ability to recover ~80% of its original viscosity within 60 s of extrusion and a shape retention factor of ~1. The extrudability, shape retention and buildability aspects were successfully demonstrated by printing a 5-layered 3D structure without any deformations. The final product contained brucite and M-S-H as hydration products, which were the main contributor to mechanical performance and microstructural densification.

• Item Type: Articles
• Additional Information: The authors would like to acknowledge Sembcorp Architects & Engineers Pte. Ltd. and National Research Foundation (NRF) Singapore for their funding and support in this research project.
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Unluer, Dr Cise
• Authors: Panda, B., Sonat, C., Yang, E.-H., Tan, M. J., and Unluer, C.
• College/School: College of Science and Engineering > School of Engineering > Infrastructure and Environment
• Journal Name: Cement and Concrete Composites
• Publisher: Elsevier
• ISSN: 0958-9465
• ISSN (Online): 1873-393X
• Published Online: 25 December 2020
• Copyright Holders: Copyright © 2020 Elsevier
• First Published: First published in Cement and Concrete Composites 117:103901
• Publisher Policy: Reproduced in accordance with the copyright policy of the publisher