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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
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" }