Title:
Characterization of Extrudability Using Rheology and Desorptivity
Author(s):
Kavya Vallurupalli, Nicolas Ali Libre, and Kamal H. Khayat
Publication:
Materials Journal
Volume:
121
Issue:
2
Appears on pages(s):
5-16
Keywords:
extrudability; fluid filtration; printability window; rheology; three-dimensional (3-D) printing
DOI:
10.14359/51740301
Date:
4/1/2024
Abstract:
Successful implementation of extrusion-based three-dimensional
(3-D) printing requires the development of print materials with
adapted rheology. In this study, filtration characteristics coupled
with rheological properties of mortar mixtures are investigated to
characterize the extrudability of print materials and establish a
“printability window” (that is, the acceptable range of material
properties for successful extrusion and shape stability). The extrudability
was measured as the maximum force needed for the ram
extrusion of the material. The fluid filtration rate was assessed in
terms of desorptivity of the fresh mixture under pressure. The yield
stress, plastic viscosity, and desorptivity were varied by changing
the water-cement ratio (w/c), high-range water-reducing admixture
(HRWRA) dosage, and welan gum (WG) content. Regression
analysis indicated that during extrusion-based printing, the yield
stress and desorptivity values can exhibit a more significant effect
on extrudability than plastic viscosity.