Effect of printing parameters on interlayer bond strength of 3D printed limestone-calcined clay-based cementitious materials

An experimental and numerical study

Journal article (2020)

Authors

Y. Chen Materials and Environment - CEG
K. Jansen Materials and Environment - CEG
Hongzhi Zhang Materials and Environment - CEG , Shandong University
C. Romero Rodriguez Materials and Environment - CEG
Y. Gan Materials and Environment - CEG
O. Çopuroğlu Materials and Environment - CEG
Erik Schlangen Materials and Environment - CEG
Research Group
Materials and Environment (CEG) (TU Delft)
Copyright: © 2020 Y. Chen, K. Jansen, H. Zhang, C. Romero Rodriguez, Y. Gan, Oguzhan Copuroglu, E. Schlangen
DOI: https://doi.org/10.1016/j.conbuildmat.2020.120094
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Published Date

2020

Language

English

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Faculty

Civil Engineering & Geosciences

Department

Materials- Mechanics- Management & Design

Research Group

Materials and Environment

Abstract

For a single batch material, time intervals and nozzle standoff distances between two subsequent layers are two critical printing parameters that influence the mechanical performance of the printed concrete. This paper presents an experimental and numerical study to investigate the impacts of these printing parameters on the interlayer bond strength of the 3D printed limestone and calcined clay-based cementitious materials. All samples were manufactured by a lab-scale 3D printer equipped with a hybrid back- and down-flow nozzle (rectangular opening). The uniaxial tensile test was employed to quantify the interface adhesion of printed specimens. Moreover, the greyscale value image of microstructure, as well as the air void content and distribution of the printed specimens were acquired by X-ray computed tomography and characterized by image analysis. The experimental results showed that extending the time interval between construction of two layers could decrease the bond strength, whereas only increasing the nozzle standoff distance exhibited limited effects on that. The weak bond strength could be attributed to the high local porosity at the interface of the specimen. Additionally, numerical simulations of the uniaxial tensile test were conducted using a 2D lattice fracture model, which can predict the bond strength of printed specimens for different void content in the interface layer.

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