Title:
Effects of Print Geometry Alterations and Layer Staggering on the Mechanical Properties of Plain and Fiber-Reinforced 3D Printed Concrete
Author(s):
Tripathi
Publication:
Web Session
Volume:
ws_F24_Tripathi1.pdf
Issue:
Appears on pages(s):
Keywords:
DOI:
Date:
11/3/2024
Abstract:
Conventional approaches to concrete 3D printing relies on printing concrete in a straight (linear) print path, with layers overlaid on top of each other. This results in inter-layer and inter-filament joints being potential weak spots that compromise the mechanical performance. This paper evaluates simple alterations to the print geometry to mitigate some of these effects. A printable mixture with 30% of limestone powder replacing cement (by mass), with a 28-day compressive strength of about 70 MPa in the strongest direction, is used. S- and 3-shaped print paths are evaluated as alternatives to the linear print path. Staggering of the layers ensures that the inter-filament joints do not lie on the same plane along the depth. Flexural strength enhancement is observed when print geometries are changed and/or layers are staggered. The study shows that print geometry modifications mitigate mechanical property reductions attributed to inter-filament defects in concrete 3D printing.