Title:
Linking Solids Content and Flow Properties of Mortars to their Three-Dimensional Printing Characteristics
Author(s):
Fabian B. Rodriguez, Jan Olek, Reza Moini, Pablo D. Zavattieri, and Jeffrey P. Youngblood
Publication:
Materials Journal
Volume:
118
Issue:
6
Appears on pages(s):
371-382
Keywords:
buildability; dimensional stability; flow; fresh-state properties; mortar; print quality; solids content; three-dimensional (3D) printing; vertical and horizontal deformations
DOI:
10.14359/51733136
Date:
11/1/2021
Abstract:
Layer-by-layer additive manufacturing (AM) of cement-based elements requires an understanding of the fresh-state characteristics of the materials. The focus of this work was on linking the flow properties and solids content of mortars with their three-dimensional (3D) printing characteristics (printability, buildability, and dimensional stability of multilayer elements). In the initial stages of the study, the analysis of the combined effects of solids content and flow characteristics of mortars helped to identify the boundaries of a printable/buildable zone for the 3D-printing system with the 4.0 mm diameter nozzle used in the study. The mortars that were located inside the printable/buildable zone were subsequently used to 3D print multilayer prismatic elements. The quality of printed elements was assessed by quantifying their dimensional stability. Elements with vertical deformations lower than 5% were classified as high-quality type, whereas those with deformations between 5 and 10% were classified as good-quality type. The findings of the research indicate that to produce acceptable quality elements while using a 3D-printing system with a 4.0 mm diameter nozzle, the solids content of mortars should be in the range of 60 to 70% and their flow values should be in the range of 90 to 160%. These findings were further expanded upon by comparing them with literature-based information on the extent of the printable/buildable zone for mixtures with a wide range of solids contents that were 3D-printed with larger nozzles. Such information is important with respect to the ability to convert mortar mixtures
used in the current study to concrete mixtures for use with larger-scale 3D-printing systems.
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