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Published in:
2022 | OriginalPaper | Chapter
Impact of Drying of 3D Printed Cementitious Pastes on Their Degree of Hydration
Authors : Rita M. Ghantous, Yvette Valadez-Carranza, Steven R. Reese, W. Jason Weiss
Published in: Third RILEM International Conference on Concrete and Digital Fabrication
Publisher: Springer International Publishing
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Abstract
The 3D printing of cementitious materials has been proposed as a method to reduce costs and waste associated with formwork. However, the 3D printing of concrete faces some challenges. One specific obstacle is related to the curing and shrinkage of the printed cementitious materials. These elements often contain a high paste content and poor curing conditions. Information is needed about the drying behavior of cementitious elements with very high surface to volume ratio that are exposed to drying nearly immediately upon placement. This study uses neutron radiography to evaluate the impact of the drying of printed cement paste samples on their degree of hydration. Exposing 3D printed samples to the atmosphere, (i.e., drying) severely limited the hydration. The impact of drying was highly dependent on the surface to volume ratio of the element. The degree of hydration of a material is linearly correlated to the square root of its volume to surface ratio.