Abstract
Viscosity and static yield stress are key rheological properties for 3D concrete printing (3DCP), where high static yield stress is associated with high buildability and shape stability and low viscosity is associated with extrudability and pumping. The challenge in concrete rheology lies in decoupling the effect of admixtures on these two properties, i.e. achieving high static yield stresses while still maintaining moderately low viscosities. In this paper, we present a hybridized additive system of nanoclays and viscosity modifying admixtures that can tailor the rheological properties of cement composites to meet 3DCP performance requirements. Further, because 3DCP is a technology of scales, any additive must meet scalability and stability requirements for construction, i.e. ease of processing in abundance and relatively low cost, and exhibit an extended shelf life. We examine different methods of synthesizing the hybrid systems and examine their stability through measuring their effect on cement rheology at different component ratios and at different time stamps from the time of hybridization. We then demonstrate their impact on printing performance by producing complex 3D prints utilizing cement pastes modified with the hybridized additive system.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
References
Khoshnevis, B.: Automated construction by contour crafting—related robotics and information technologies. Autom. Constr. 13(1), 5–19 (2004). ISSN 0926-5805
Roussel, N.: Rheological requirements for printable concretes. Cem. Concr. Res. 112, 76–85 (2018). ISSN 0008-8846
Marchon, D., Kawashima, S., Bessaies-Bey, H., Mantellato, S., Ng, S.: Hydration and rheology control of concrete for digital fabrication: potential admixtures and cement chemistry. Cem. Concr. Res. 112, 96–110 (2018). ISSN 0008-8846
Roussel, N., Ovarlez, G., Garrault, S., Brumaud, C.: The origins of thixotropy of fresh cement pastes. Cem. Concr. Res. 42(1), 148–157 (2012). ISSN 0008-8846
Lomboy, G.R., Wang, K.: Semi-flowable self-consolidating concrete and its application. Int. J. Mater. Struct. Integrity 9(1–3), 61–71 (2015). https://doi.org/10.1504/IJMSI.2015.071110
Dejaeghere, I., Sonebi, M., De Schutter, G.: Influence of nano-clay on rheology, fresh properties, heat of hydration and strength of cement-based mortars. Constr. Build. Mater. 222, 73–85 (2019). ISSN 0950-0618
Liu, Y., Han, J., Li, M., Yan, P.: Effect of a nanoscale viscosity modifier on rheological properties of cement pastes and mechanical properties of mortars. Constr. Build. Mater. 190, 255–264 (2018). ISSN 0950-0618
Kawashima, S., Kim, J.H., Corr, D.J., Shah, S.P.: Study of the mechanisms underlying the fresh-state response of cementitious materials modified with nanoclays. Constr. Build. Mater. 36, 749–757 (2012). ISSN 0950-0618
Kazemian, A., Yuan, X., Cochran, E., Khoshnevis, B.: Cementitious materials for construction-scale 3D printing: laboratory testing of fresh printing mixture. Constr. Build. Mater. 145, 639–647 (2017). https://doi.org/10.1016/j.conbuildmat.2017.04.015. ISSN 0950-0618
ActiveMinerals International, LLC: What is Acti-Gel® 208 and the science behind Acti-Gel® 208 (2017)
Qian, Y., De Schutter, G.: Enhancing thixotropy of fresh cement pastes with nanoclay in presence of polycarboxylate ether superplasticizer (PCE). Cem. Concr. Res. 111, 15–22 (2018). ISSN 0008-8846
Panda, B., Ruan, S., Unluer, C., Tan, M.J.: Improving the 3D printability of high volume fly ash mixtures via the use of nano attapulgite clay. Compos. Part B Eng. 165, 75–83 (2019). ISSN 1359-8368
Acknowledgements
The authors would like to acknowledge the National Science Foundation (Award # 1653419) for financial support, and technical support by the staff of Columbia University’s Carleton Laboratory. We would also like to acknowledge the efforts of Hajin Kim, Elise Westhoff, Jonathan Rosas and Jithu Alexander for contributing to our experimental procedures and testing.
Author information
Authors and Affiliations
Corresponding author
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2020 RILEM
About this paper
Cite this paper
Douba, A., Chan, C., Berrios, S., Kawashima, S. (2020). Synthesis of Hybridized Rheological Modifiers for 3D Concrete Printing. In: Bos, F., Lucas, S., Wolfs, R., Salet, T. (eds) Second RILEM International Conference on Concrete and Digital Fabrication. DC 2020. RILEM Bookseries, vol 28. Springer, Cham. https://doi.org/10.1007/978-3-030-49916-7_4
Download citation
DOI: https://doi.org/10.1007/978-3-030-49916-7_4
Published:
Publisher Name: Springer, Cham
Print ISBN: 978-3-030-49915-0
Online ISBN: 978-3-030-49916-7
eBook Packages: EngineeringEngineering (R0)