Title:
Anisotropic Chloride Transport in 3D Printed Concrete and its Dependence on Layer Height and Interface Types
Author(s):
Sahil Surehali
Publication:
Web Session
Volume:
ws_S23_SahilSurehali.pdf
Issue:
Appears on pages(s):
Keywords:
DOI:
Date:
4/2/2023
Abstract:
3D-printed concrete (3DPC) elements demonstrate interfacial defects, which influence ionic transport through the printed element. The printing parameters, such as layer dimensions, dictates the number and quality of interfaces, rendering a directional dependence to the ionic transport. This work focuses on the impact of layer heights (6, 13, and 20 mm) and transport directions (along the direction of printing, direction of layer build-up, and direction perpendicular to above two directions) on non-steady state chloride migration coefficients (Dnssm) of 3DPC. The direction-dependent Dnssm values of the printed samples are 10-30% higher than those of companion cast samples. Interrogation of the microstructure of printed samples through porosity and electricaly conductivity, along with the transport quantification, establishes the influence of anisotropy on transport behavior. The interfiliments are shown to be more detrimental from an ionic transport standpoint, thereby providing guidelines on choosing the printing direction with respect to direction of ionic ingress.