Mechanical Performance of Commercially Available Premix UHPC-Based 3D Printable Concrete
Abstract
:1. Introduction
2. Materials and Methods
2.1. Materials and Mix Preparation
2.2. 3D Concrete Printing Equipment
2.3. Test Methods
2.3.1. Mechanical Properties of Fresh 3DPC
2.3.2. Mechanical Properties of Hardened 3DPC
3. Results and Discussion
3.1. Fresh Properties
3.2. Hardened Properties
4. Conclusions
- By reducing the superplasticizer dosage in fresh UHPC mixture, it was possible to achieve the requirements for a commercially available UHPC-class material printable.
- The results in the fresh state indicated high buildability was obtained with minimal deformations, as well as high strength at early ages.
- The mechanical performance showed anisotropic behavior. The highest flexural strengths were achieved when force was applied perpendicular and parallel to the printing direction. In both directions, performance was similar, but flexural strength was lowest when applied parallel to layer interfaces. In contrast, the printed UHPC samples showed decreased compressive strength. In the direction perpendicular to the printing direction, the compressive strength was highest, while in the other two directions, it was similar. In addition, the compressive strength of the printable specimens was lower than that of the mold-cast specimens. Flexural strength, however, was higher in printed specimens than in mold-cast specimens. Finally, UHPC performs well in both fresh and hardened states, making it possible to build thinner 3D printed elements than with other 3D printable concretes.
- In this report, one of the four basic components of the UHPC was modified (binders, aggregates, water, and additive) to produce a commercially available premixed UHPC-based printable. Nevertheless, it is one of the possibilities. To determine a dosage mixture that results in optimal behavior, more research will be conducted in the future by modifying different components.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Medicis, C.; Gonzalez, S.; Alvarado, Y.A.; Vacca, H.A.; Mondragon, I.F.; García, R.; Hernandez, G. Mechanical Performance of Commercially Available Premix UHPC-Based 3D Printable Concrete. Materials 2022, 15, 6326. https://doi.org/10.3390/ma15186326
Medicis C, Gonzalez S, Alvarado YA, Vacca HA, Mondragon IF, García R, Hernandez G. Mechanical Performance of Commercially Available Premix UHPC-Based 3D Printable Concrete. Materials. 2022; 15(18):6326. https://doi.org/10.3390/ma15186326
Chicago/Turabian StyleMedicis, Carolina, Sergio Gonzalez, Yezid A. Alvarado, Hermes A. Vacca, Ivan F. Mondragon, Rodolfo García, and Giovanni Hernandez. 2022. "Mechanical Performance of Commercially Available Premix UHPC-Based 3D Printable Concrete" Materials 15, no. 18: 6326. https://doi.org/10.3390/ma15186326