Comparison between methods for indirect assessment of buildability in fresh 3D printed mortar and concrete

Ivanova, Irina; Ivaniuk, Egor; Bisetti, Sameercharan; Nerella, Venkatesh Naidu; Mechtcherine, Viktor

doi:10.1016/j.cemconres.2022.106764

Cited by 52 publications

(7 citation statements)

References 37 publications

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“…After 130 min, the static yield stress of the 1.50% TiO 2 mix grew exponentially, so it was not considered in the linear fit to determine A thix . It is worth mentioning that the shear stress values found were significantly lower than those reported for 3DP mortars [ 58 , 59 ] due to the absence of aggregates in the samples.…”

Section: Resultscontrasting

confidence: 64%

Effect of TiO2 Nanoparticles on the Fresh Performance of 3D-Printed Cementitious Materials

et al. 2022

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3D printing (3DP) of cementitious materials shows several advantages compared to conventional construction methods, but it requires specific fresh-state properties. Nanomaterials have been used in cement-based materials to achieve specific fresh and hardened properties, being potential candidates for 3DP applications. However, there are no reports on using TiO2 nanoparticles (nano-TiO2) in 3DP cementitious composites. Thus, the current work aims to assess the effect of nano-TiO2 on the fresh performance of 3DP cementitious materials. For this purpose, nano-TiO2 was incorporated in pastes and mortars from 0 to 1.5 wt.%. Time-resolved hydration (in situ XRD) and rheological and printing-related properties (buildability and printability) were evaluated. Results showed that nano-TiO2 particles enhanced the cement hydration kinetics, leading to further ettringite formation up to 140 min compared to plain cement paste. Rheological measurements showed that the nano-TiO2 incorporation progressively increased the static and dynamic stress, viscosity, and structuration rate of pastes. Furthermore, nano-TiO2 improved the buildability of the composites, progressively increasing the maximum number of successive layers printed before failure from 11 (0 wt.% TiO2) to 64 (1.5 wt.% TiO2). By contrast, the nano-TiO2 addition reduced the printability (i.e., the printable period during which the sample was able to be molded by the 3D-printing process) from 140 min (0% TiO2) to 90 min (1.5% TiO2). Thus, incorporating “high” nano-TiO2 contents (e.g., >1 wt.%) was beneficial for buildability but would require a quicker 3DP process. The adoption of nano-TiO2 contents of around 0.75–1.00% may be an interesting choice since it reduced the printability of paste by 30 min compared with the control mix but allowed for printing 24 layers (118% higher than plain mortar).

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Section: Resultscontrasting

confidence: 64%

Effect of TiO2 Nanoparticles on the Fresh Performance of 3D-Printed Cementitious Materials

et al. 2022

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“…Für die automatisierte Serienfertigung werden verschiedene innovative Fertigungsverfahren wie der 3D-Druck [22][23][24], die Herstellung mithilfe 3D-gedruckter, rezyklierbarer Sandschalungen [25] oder Strangpressverfahren für Stützen aus ultrahochfestem Beton (UHFB) [26] adaptiert bzw. entwickelt.…”

Section: Einführungunclassified

Modulare Fußgängerbrücken aus seriell hergestellten Betonfertigteilen

Rettinger,

Prziwarzinski,

Meyer

et al. 2023

Beton und Stahlbetonbau

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Modulare Baukonstruktionen ermöglichen die serielle und automatisierte Herstellung von Fertigteilen, welche kontrolliert in einem Fertigteilwerk produziert und anschließend auf der Baustelle in kurzer Zeit montiert werden können. Hierdurch können Herstellungsprozesse weitreichend optimiert und neue Technologien der automatisierten und robotergestützten Fertigung eingesetzt werden. Die Fertigung im Werk verringert Lärm, Staub und Stau auf den Baustellen und durch die Rationalisierung von Prozessen im Fertigteilwerk können Verschnitt‐ und Abfallmengen minimiert und somit Ressourcen eingespart werden. In der vor Witterung geschützten Umgebung können zudem Hochleistungswerkstoffe mit hoher Präzision verarbeitet werden, sodass deren Eigenschaften optimal ausgenutzt werden und eine hohe gleichbleibende Qualität erzielt wird. Von dem planenden Ingenieur verlangt modulares Bauen ein umfassendes Verständnis und die Berücksichtigung der Herstellungsprozesse sowie eine sorgfältige Planung aller Fügestellen des Tragwerks. Das Planungsteam steht vor der Herausforderung, trotz aller Anforderungen durch die Modularisierung, Rationalisierung und Fertigung ein funktionales, dauerhaftes und ästhetisch hochwertiges Bauwerk zu entwerfen. In den in diesem Beitrag vorgestellten Entwurfsstudien stellen sich die Autoren dieser Aufgabe, indem sie Technologien aus aktuellen Forschungsprojekten des modularen Betonbaus in einem einheitlichen Entwurfsszenario einer Fußgängerbrücke anwenden.

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“…The participating research projects have aimed to understand the principal reasons for the shortcomings in the structure of rheological knowledge and experience, working to fill these gaps using advanced analytical [11][12][13][14][15][16][17], experimental [18][19][20][21][22][23][24], and numerical tools [25][26][27][28][29][30]. Special attention has been paid to aspects such as testing fresh cement-based suspensions [9; 31-33] capturing the effects of binder flocculation and early hydration in the…”

Section: Scientific Outcomes Of Spp 2005 Projectsmentioning

confidence: 99%

Mastering the rheology of fresh concrete: New knowledge from a DFG priority program SPP 2005

Mechtcherine

2023

ce papers

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The processing of cement‐based building materials represents the technological core in the construction and maintenance of structures. However, a scientific framework for mastering rheology‐based processes is still in an early stage of its development. The reason for this is the extremely high complexity of cementitious systems. This complexity includes the high chemical reactivity of mineral binders, the complex multi‐phase nature of fresh concrete or mortar, and a wide range of deformation rates during various technological processes, which result in extremely high demands for characterization and simulation methods. The goal of the DFG Priority Program SPP 2005 “Opus Fluidum Futurum – Rheology of reactive, multiscale, multiphase construction materials” is to ascertain and describe the scientific fundamentals for understanding and, subsequently, designing rheology‐based construction processes as well as for developing innovative, sustainable building materials and associated pioneering processing technologies. The article at hand presents the purpose and the structure of the collaborative research as well as the achievements of the priority program. Furthermore, it offers some insights into ongoing and planned research.

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Comparison between methods for indirect assessment of buildability in fresh 3D printed mortar and concrete

Cited by 52 publications

References 37 publications

Effect of TiO2 Nanoparticles on the Fresh Performance of 3D-Printed Cementitious Materials

Effect of TiO2 Nanoparticles on the Fresh Performance of 3D-Printed Cementitious Materials

Modulare Fußgängerbrücken aus seriell hergestellten Betonfertigteilen

Mastering the rheology of fresh concrete: New knowledge from a DFG priority program SPP 2005

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