Publication detail

Interface Behavior and Interface Tensile Strength of a Hardened Concrete Mixture with a Coarse Aggregate for Additive Manufacturing

VESPALEC, A. NOVÁK, J. KOHOUTKOVÁ, A. VOSYNEK, P. PODROUŽEK, J. ŠKAROUPKA, D. ZIKMUND, T. KAISER, J. PALOUŠEK, D.

Original Title

Interface Behavior and Interface Tensile Strength of a Hardened Concrete Mixture with a Coarse Aggregate for Additive Manufacturing

Type

journal article in Web of Science

Language

English

Original Abstract

3D concrete printing technology (3DCP) is a relatively new technology that was first established in the 1990s. The main weakness of the technology is the interface strength between the extruded layers, which are deposited at different time intervals. Consequently, the interface strength is assumed to vary in relation to the time of concrete casting. The proposed experimental study investigated the behavior of a hardened concrete mixture containing coarse aggregates that were up to 8 mm in size, which is rather unusual for 3DCP technology. The resulting direct tensile strength at the layer interface was investigated for various time intervals of deposition from the initial mixing of concrete components. To better understand the material behavior at the layer interface area, computed tomography (CT) scanning was conducted, where the volumetric and area analysis enabled validation of the pore size and count distribution in accordance with the layer deposition process. The analyzed CT data related the macroscopic anisotropy and the resulting crack pattern to the temporal and spatial variability that is inherent to the additive manufacturing process at construction scales while providing additional insights into the porosity formation during the extrusion of the cementitious composite. The observed results contribute to previous investigations in this field by demonstrating the causal relationships, namely, how the interface strength development is determined by time, deposition process, and pore size distribution. Moreover, in regard to the printability of the proposed coarse aggregate mixture, the specific time interval is presented and its interplay with interface roughness and porosity is discussed.

Keywords

3DCP; cementitious composite; concrete testing; concrete deposition; interface behavior; digital concrete; extrusion manufacturing; computed tomography; construction-scale 3D printing; large-scale additive manufacturing; Portland cement concrete; extrusion-based concrete print

Authors

VESPALEC, A. NOVÁK, J. KOHOUTKOVÁ, A. VOSYNEK, P. PODROUŽEK, J. ŠKAROUPKA, D. ZIKMUND, T. KAISER, J. PALOUŠEK, D.

Released

15. 11. 2020

Publisher

MDPI

Location

BASEL

ISBN

1996-1944

Periodical

Materials

Year of study

13

Number

22

State

Swiss Confederation

Pages from

1

Pages to

20

Pages count

19

URL

https://www.mdpi.com/1996-1944/13/22/5147/htm

Full text in the Digital Library

http://hdl.handle.net/11012/195748

BibTex

@article{BUT166165,
  author="Arnošt {Vespalec}",
  title="Interface Behavior and Interface Tensile Strength of a Hardened Concrete Mixture with a Coarse Aggregate for Additive Manufacturing",
  journal="Materials",
  year="2020",
  volume="13",
  number="22",
  pages="1--20",
  doi="10.3390/ma13225147",
  issn="1996-1944",
  url="https://www.mdpi.com/1996-1944/13/22/5147/htm"
}