Abstract
This study focus on the early age properties of two mortar formulations designed for a 3D printing extrusion process. They follow a new design and process strategy, which consists in formulating a mortar to be self-levelling, to optimize pumpability, and then incorporating an additive in the extrusion nozzle to modify rheology properties and setting properties to adapt it to the requirement of the printing process (self-sustaining as soon as the material exits the nozzle, and fast strength acquisition). Two types of additives are considered: an alkali-free shotcrete accelerator and a starch ether based VMA. Compression and shear strength measurements from 2 min to 4 h after the incorporation of the additive demonstrate the capacity of the method to create mortars with strength acquisition vastly superior to results from the literature. Lab-scale extrusion and operational feedback from 3D printing customers demonstrate the feasibility at operational scale. The variety of properties obtainable by playing with different types of additives is also discussed.
The original version of this chapter was revised: Incorrect information have been removed. The correction to this chapter is available at https://doi.org/10.1007/978-3-319-99519-9_31
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Change history
10 November 2018
In Chapter “Challenges of Real-Scale Production with Smart Dynamic Casting”, low-resolution Figure 4 is replaced with high resolution, Figure 5 is replaced with new figure and Figure 6 and the graph near are positioned as per the standard.
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Acknowledgements
The resulted presented in this study are originated in the research project HINDCON (Hybrid INDustrial CONstruction) funded by the European Commission (Grant Agreement n°723611).
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Esnault, V., Labyad, A., Chantin, M., Toussaint, F. (2019). Experience in Online Modification of Rheology and Strength Acquisition of 3D Printable Mortars. In: Wangler, T., Flatt, R. (eds) First RILEM International Conference on Concrete and Digital Fabrication – Digital Concrete 2018. DC 2018. RILEM Bookseries, vol 19. Springer, Cham. https://doi.org/10.1007/978-3-319-99519-9_3
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DOI: https://doi.org/10.1007/978-3-319-99519-9_3
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