An approach to develop printable strain hardening cementitious composites

Stefan Chaves Figueiredo (Corresponding author), Claudia Romero Rodríguez, Zeeshan Ahmed, D.H. Bos, Yading Xu, Theo Salet, Oguzhan Çopuroglu, Erik Schlangen, Freek Bos

Research output: Contribution to journalArticleAcademicpeer-review

5 Citations (Scopus)

Abstract

New additive manufacturing methods for cementitious materials hold a high potential to increase automation in the construction industry. However, these methods require new materials to be developed that meet performance requirements related to specific characteristics of the manufacturing process. The appropriate characterization methods of these materials are still a matter of debate. This study proposes a rheology investigation to systematically develop a printable strain hardening cementitious composite mix design. Two known mixtures were employed and the influence of several parameters, such as the water-to-solid ratio, fibre volume percentage and employment of chemical admixtures, were investigated using a ram extruder and Benbow-Bridgwater equation. Through printing trials, rheology parameters as the initial bulk and shear yield stress were correlated with variables commonly employed to assess printing quality of cementitious materials. The rheology properties measured were used to predict the number of layers a developed mixture could support. Selected mixtures had their mechanical performance assessed through four-point bending, uni-axial tensile and compressive strength tests, to confirm that strain hardening behaviour was obtained. It was concluded that the presented experimental and theoretical framework are promising tools, as the bulk yield stress seems to predict buildability, while shear yield stress may indicate a threshold for pumpability.
LanguageEnglish
Article number107651
Number of pages17
JournalMaterials & Design
Volume2019
Issue number169
DOIs
StatePublished - 14 Mar 2019

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Strain hardening
Rheology
Yield stress
Composite materials
Printing
3D printers
Extruders
Construction industry
Compressive strength
Tensile strength
Automation
Water
Fibers

Cite this

Chaves Figueiredo, S., Romero Rodríguez, C., Ahmed, Z., Bos, D. H., Xu, Y., Salet, T., ... Bos, F. (2019). An approach to develop printable strain hardening cementitious composites. Materials & Design, 2019(169), [107651]. DOI: 10.1016/j.matdes.2019.107651
Chaves Figueiredo, Stefan ; Romero Rodríguez, Claudia ; Ahmed, Zeeshan ; Bos, D.H. ; Xu, Yading ; Salet, Theo ; Çopuroglu, Oguzhan ; Schlangen, Erik ; Bos, Freek. / An approach to develop printable strain hardening cementitious composites. In: Materials & Design. 2019 ; Vol. 2019, No. 169.
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Chaves Figueiredo, S, Romero Rodríguez, C, Ahmed, Z, Bos, DH, Xu, Y, Salet, T, Çopuroglu, O, Schlangen, E & Bos, F 2019, 'An approach to develop printable strain hardening cementitious composites' Materials & Design, vol. 2019, no. 169, 107651. DOI: 10.1016/j.matdes.2019.107651

An approach to develop printable strain hardening cementitious composites. / Chaves Figueiredo, Stefan (Corresponding author); Romero Rodríguez, Claudia ; Ahmed, Zeeshan; Bos, D.H.; Xu, Yading; Salet, Theo; Çopuroglu, Oguzhan ; Schlangen, Erik; Bos, Freek.

In: Materials & Design, Vol. 2019, No. 169, 107651, 14.03.2019.

Research output: Contribution to journalArticleAcademicpeer-review

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AU - Chaves Figueiredo,Stefan

AU - Romero Rodríguez,Claudia

AU - Ahmed,Zeeshan

AU - Bos,D.H.

AU - Xu,Yading

AU - Salet,Theo

AU - Çopuroglu,Oguzhan

AU - Schlangen,Erik

AU - Bos,Freek

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AB - New additive manufacturing methods for cementitious materials hold a high potential to increase automation in the construction industry. However, these methods require new materials to be developed that meet performance requirements related to specific characteristics of the manufacturing process. The appropriate characterization methods of these materials are still a matter of debate. This study proposes a rheology investigation to systematically develop a printable strain hardening cementitious composite mix design. Two known mixtures were employed and the influence of several parameters, such as the water-to-solid ratio, fibre volume percentage and employment of chemical admixtures, were investigated using a ram extruder and Benbow-Bridgwater equation. Through printing trials, rheology parameters as the initial bulk and shear yield stress were correlated with variables commonly employed to assess printing quality of cementitious materials. The rheology properties measured were used to predict the number of layers a developed mixture could support. Selected mixtures had their mechanical performance assessed through four-point bending, uni-axial tensile and compressive strength tests, to confirm that strain hardening behaviour was obtained. It was concluded that the presented experimental and theoretical framework are promising tools, as the bulk yield stress seems to predict buildability, while shear yield stress may indicate a threshold for pumpability.

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Chaves Figueiredo S, Romero Rodríguez C, Ahmed Z, Bos DH, Xu Y, Salet T et al. An approach to develop printable strain hardening cementitious composites. Materials & Design. 2019 Mar 14;2019(169). 107651. Available from, DOI: 10.1016/j.matdes.2019.107651