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Rheological measurements of printable mortars containing calcium sulfoaluminate cement

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Abstract
The introduction of digital fabrication in the construction field presents a significant advantage over conventional production methods. As the material itself shoud fulfill some of the requirements that used to be imposed on the formwork, improving the mix-design for the new technique remains a challenge. Although many approaches exist to adjust the rheological properties of printable mortars by modifying mix designs, combining the appropriate rheological properties of the fresh printable material with an optimized setting rate, can introduce a suitable mix-design for the construction industry. Meanwhile, the main objective of digital fabrication, namely to increase the environmental and economic sustainability should be taken into account. This experimental study represents the rheological behaviour of printable mixture composed of two different types of cement : Ordinary Portland Cement (OPC) and Calcium Sulfo-Aluminate cement (CSA). This investigation considered a steady stress sweep method to analyze the rheological behavior of pastes composed of CSA (20% OPC replacement). The behavior of the cement pastes with OPC and CSA cement was studied in specific time intervals to determine the open time. Then, mortars were made from selected mix designs and printed in the same time gaps, to investigate the time that the deposited first layer can be stable with fewer surface defects. Automated Laser Measurements (ALM) were performed to compare the shape stability and surface quality of printed layers. The results showed that the replacement of OPC by CSA increased the yield stress in the mixtures. Moreover, when including CSA cement, mixtures were extrudable and also printable, with a reduced but efficient open time. The increasing amount of sulphoaluminate clinker resulted in higher yielding point in a shorter period of time.
Keywords
Calcium Sulfo-Aluminate cement, yielding point, printability, buildability, open time

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MLA
Azima, Mahzad, et al. “Rheological Measurements of Printable Mortars Containing Calcium Sulfoaluminate Cement.” RheoCon2 & SCC9, Proceedings, 2019.
APA
Azima, M., Lesage, K., De Schutter, G., & Van Tittelboom, K. (2019). Rheological measurements of printable mortars containing calcium sulfoaluminate cement. In RheoCon2 & SCC9, Proceedings. Dresden.
Chicago author-date
Azima, Mahzad, Karel Lesage, Geert De Schutter, and Kim Van Tittelboom. 2019. “Rheological Measurements of Printable Mortars Containing Calcium Sulfoaluminate Cement.” In RheoCon2 & SCC9, Proceedings.
Chicago author-date (all authors)
Azima, Mahzad, Karel Lesage, Geert De Schutter, and Kim Van Tittelboom. 2019. “Rheological Measurements of Printable Mortars Containing Calcium Sulfoaluminate Cement.” In RheoCon2 & SCC9, Proceedings.
Vancouver
1.
Azima M, Lesage K, De Schutter G, Van Tittelboom K. Rheological measurements of printable mortars containing calcium sulfoaluminate cement. In: RheoCon2 & SCC9, Proceedings. 2019.
IEEE
[1]
M. Azima, K. Lesage, G. De Schutter, and K. Van Tittelboom, “Rheological measurements of printable mortars containing calcium sulfoaluminate cement,” in RheoCon2 & SCC9, Proceedings, Dresden, 2019.
@inproceedings{8631260,
  abstract     = {{The introduction of digital fabrication in the construction field presents a significant advantage over conventional production methods. As the material itself shoud fulfill some of the requirements that used to be imposed on the formwork, improving the mix-design for the new technique remains a challenge. Although many approaches exist to adjust the rheological properties of printable mortars by modifying mix designs, combining the appropriate rheological properties of the fresh printable material with an optimized setting rate, can introduce a suitable mix-design for the construction industry. Meanwhile, the main objective of digital fabrication, namely to increase the environmental and economic sustainability should be taken into account.
This experimental study represents the rheological behaviour of printable mixture composed of two different types of cement : Ordinary Portland Cement (OPC) and Calcium Sulfo-Aluminate cement (CSA). This investigation considered a steady stress sweep method to analyze the rheological behavior of pastes composed of CSA (20% OPC replacement). The behavior of the cement pastes with OPC and CSA cement was studied in specific time intervals to determine the open time. Then, mortars were made from selected mix designs and printed in the same time gaps, to investigate the time that the deposited first layer can be stable with fewer surface defects. Automated Laser Measurements (ALM) were performed to compare the shape stability and surface quality of printed layers. The results showed that the replacement of OPC by CSA increased the yield stress in the mixtures. Moreover, when including CSA cement, mixtures were extrudable and also printable, with a reduced but efficient open time. The increasing amount of sulphoaluminate clinker resulted in higher yielding point in a shorter period of time.}},
  author       = {{Azima, Mahzad and Lesage, Karel and De Schutter, Geert and Van Tittelboom, Kim}},
  booktitle    = {{RheoCon2 & SCC9, Proceedings}},
  keywords     = {{Calcium Sulfo-Aluminate cement,yielding point,printability,buildability,open time}},
  language     = {{eng}},
  location     = {{Dresden}},
  pages        = {{9}},
  title        = {{Rheological measurements of printable mortars containing calcium sulfoaluminate cement}},
  year         = {{2019}},
}