Advertisement

The Effect of Print Parameters on the (Micro)structure of 3D Printed Cementitious Materials

  • J. Van Der PuttenEmail author
  • G. De Schutter
  • K. Van Tittelboom
Conference paper
Part of the RILEM Bookseries book series (RILEM, volume 19)

Abstract

The extrusion-based 3D printing method is one of the main additive manufacturing techniques worldwide in construction industry. This method is capable to produce large scale components with complex geometries without the use of an expensive formwork. The main advantages of this technique are encountered by the fact that the end result is a layered structure. Within these elements, voids can form between the filaments and also the time gap between the different layers will be of great importance. These factors will not only affect the mechanical performance but will also have an influence on the durability of the components. In this research, a custom-made 3D printing apparatus was used to simulate the printing process. Layered specimens with 0, 10 and 60 min delay time (i.e. the time between printing of subsequent layers) have been printed with two different printing speeds (1.7 cm/s and 3 cm/s). Mechanical properties including compressive and inter-layer bonding strength have been measured and the effect on the pore size and pore size distribution was taken into account by performing Mercury Intrusion Porosimetry (MIP) tests. First results showed that the mechanical performance of high speed printed specimens is lower for every time gap due to a decreased surface roughness and the formation of bigger voids. The porosity of the elements shows an increasing trend when enlarging the time gap and a higher printing speed will create bigger voids and pores inside the printed material.

Keywords

3D printing Mechanical properties Microstructure Porosity Pore size distribution 

Notes

Acknowledgements

The authors would like to acknowledge the support by EFRO for this C3PO-project with a total amount of € 668 320.41.

References

  1. 1.
    Zareiyan, B., Khoshnevis, B.: Interlayer adhesion and strength of structures in contour crafting: effects of aggregate size, extrusion rate, and layer thickness. Autom. Constr. 81, 112–121 (2017)CrossRefGoogle Scholar
  2. 2.
    Panda, B., et al.: Measurement of tensile bond strength of 3D printed geopolymer mortar. Measurement 113, 108–116 (2018)CrossRefGoogle Scholar
  3. 3.
    Zareiyan, B., Khoshnevis, B.: Effects of interlocking on interlayer adhesion and strength of structures in 3D printing of concrete. Autom. Constr. 83, 212–221 (2017)CrossRefGoogle Scholar
  4. 4.
    Eduardo Nuno Brito Santos, P.M.D., Eduardo, J.: Factors affecting bond between new and old concrete. Mater. J. 108(4), 449–456 (2011)Google Scholar
  5. 5.
    Boel, V.: Microstructuur van zelfverdichtend beton in relatie met gaspermeabiliteit en duurzaamheidsaspecten, p. 320. Ph.D. dissertation, University of Ghent (2007)Google Scholar

Copyright information

© RILEM 2019

Authors and Affiliations

  1. 1.Ghent UniversityGhentBelgium

Personalised recommendations