Influence of printing parameters on the thermal properties of 3D-printed construction structures

• Published in: Energy (Oxford) Vol. 305; p. 132265
• Main Authors: Sovetova, Meruyert, Calautit, John Kaiser
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.10.2024
• Subjects: 3D printed concrete; concrete; energy efficiency; Energy-efficient structure; extrusion; heat flow; Heat flow meter; Infrared thermal imaging; Material extrusion; microstructure; Pore structure; porosity; Printing parameters; SEM; thermal conductivity; Thermal properties; Thermal properties; Material extrusion; Heat flow meter; Printing parameters; Pore structure; SEM; Energy-efficient structure; 3D printed concrete; Infrared thermal imaging
• ISSN: 0360-5442
• DOI: 10.1016/j.energy.2024.132265

3D printing in the construction sector is a promising, sustainable approach with the potential to build energy-efficient buildings. However, there is a lack of studies on the thermal properties of 3D-printed structures, which are fundamental to their energy efficiency. This study investigates the impact of printing parameters on thermal conductivity and defect development in 3D-printed concrete structures. Heat flow meter, scanning electron microscope and infrared imaging techniques were employed to assess the thermal properties and microstructure of 3D-printed samples. The results demonstrate that printing parameters significantly influence the porosity, void formation, and microstructural characteristics of 3D-printed concrete, ultimately affecting thermal properties. An increase in extrusion rate leads to higher thermal conductivity, whereas an increase in speed and standoff distance reduces thermal conductivity. Excessive spacing between printed lines can induce voids and gaps, contributing to lower thermal conductivity, while minimal spacing can promote higher porosity and larger pores. Infrared imaging revealed nonuniform thermal distribution in 3D-printed structures caused by the layered structure and voids in interlayer gaps. This study provides valuable insights for designing and constructing energy-efficient 3D-printed buildings, contributing to the development of sustainable building practices and the advancement of additive manufacturing in construction. [Display omitted] •The printing process significantly affects the thermal properties of 3D-printed concrete structures.•Increase in printing speed, nozzle standoff distance decreases thermal conductivity.•An increase in extrusion rate increases thermal conductivity.•Thermal defects can be caused by the printing process.•3D printed structures have nonuniform heat transfer with specific pattern.