Title:
The “Lubricating Layer” in 3D Printed Concrete: In-situ Moisture Content Quantification Using Neutron Radiography
Author(s):
Luiz Antonio de Siqueira Neto
Publication:
Web Session
Volume:
ws_F25_SiqueriaNeto.pdf
Issue:
Appears on pages(s):
Keywords:
DOI:
Date:
10/26/2025
Abstract:
This paper presents an in-situ neutron radiography approach to investigate water redistribution in fresh 3D-printed cement-based materials during and immediately after extrusion. A modified extrusion-based 3D printing setup allows for continuous imaging of mortar as it moves through the printer's barrel and nozzle, with high temporal and spatial resolution. Neutron radiographs are processed to extract radial moisture profiles, which reveal flow-induced particle migration effects on the distribution of moisture. The study also captures moisture movement within extruded single-line filament walls between 0-120 min after deposition, examining interactions between filaments and with the surrounding environment. By evaluating the influence of extrusion parameters, mixture compositions, and printed layer configurations on the internal moisture flux of the extruded mortars, this work provides insights into their impact on the spatial distribution of water of fresh 3D-printed materials.