Simultaneous Reinforcement of Concrete While 3D Printing

Geneidy, Omar; Kumarji, Sujay; Dubor, Alexandre; Sollazzo, Aldo

doi:10.1007/978-3-030-49916-7_87

Cited by 15 publications

(9 citation statements)

References 2 publications

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“…A forked nozzle (similar to the nozzle in pre-installed reinforcement) is designed to allow the embedding of continuous reinforcing mesh in the middle of the printed material (Figure 14b). Geneidy et al [168,169] further combined a printing nozzle with a stapler that can insert staple profiles into the printed materials, maximizing structural integrity (indicated in Figure 14c). All of those methods involve directly entraining reinforcement during printing using a highly automated printing system.…”

mentioning

confidence: 99%

Fresh and Hardened Properties of Extrusion-Based 3D-Printed Cementitious Materials: A Review

Hojati

et al. 2020

Sustainability

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3D-printing of cementitious materials is an innovative construction approach with which building elements can be constructed without the use of formwork. Despite potential benefits in the construction industry, it introduces various engineering challenges from the material point of view. This paper reviews the properties of extrusion-based 3D-printed cementitious materials in both fresh and hardened states. Four main properties of fresh-state printing materials are addressed: flowability, extrudability, buildability, and open time, along with hardened properties, including density, compressive strength, flexural strength, tensile bond strength, shrinkage, and cracking. Experimental testing and effective factors of each property are covered, and a mix design procedure is proposed. The main objective of this paper is to provide an overview of the recent development in 3D-printing of cementitious materials and to identify the research gaps that need further investigation.

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confidence: 99%

Fresh and Hardened Properties of Extrusion-Based 3D-Printed Cementitious Materials: A Review

Hojati

et al. 2020

Sustainability

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“…91 Another method that could be compatible with sequential casting is the simultaneous reinforcement of concrete during 3D printing with overlapping staples. 92 The opportunities and challenges of waterjet cut steel reinforcement have also been investigated in a series of small prototypes for topologyoptimized concrete elements. 93 Finally, metal 3D printing processes, such as wire arc additive manufacturing, can be used for the fabrication of steel structures.…”

Section: Reinforcementmentioning

confidence: 99%

3D Printed Formwork for Concrete: State-of-the-Art, Opportunities, Challenges, and Applications

Jipa

Dillenburger

2022

3D Printing and Additive Manufacturing

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Concrete is the most used human-made material in the world, and it is responsible for around 8% of the total greenhouse gas emissions worldwide. Hence, efficient concrete construction methods are one of the main foci of research in architecture, civil engineering, and material science. One recent development that promises to achieve this goal is the use of digital fabrication for building components. Most investigations focus on direct extrusion 3D printing with concrete, which has already been covered in several review articles. Conversely, this article reviews a different approach, which focuses on the indirect digital fabrication of concrete through 3D printed formworks. This approach is under investigation for structural and nonstructural, as well as for onand off-site applications, with a number of projects having already been built, but a comprehensive review of 3D printed formworks has not yet been compiled to synthesize the findings. This article provides a comprehensive map of the state-of-the-art of five different 3D printing technologies used for the fabrication of formworks so far. The aim is to serve as a fundamental reference for future research, provide a basis for consistent language in this field, and support the development of construction standards. The article further discusses the new geometric possibilities with 3D printed formworks and their potential for making concrete construction more sustainable. In addition, the opportunities and challenges of 3D printed formworks are evaluated in the context of other traditional and digital fabrication tools. A synthetic classification in five functional typologies is proposed and illustrated with 30 representative case studies. Finally, the article concludes with a brief reflection on the role of 3D printing in the broader context of formwork innovation and a possible outlook for this technology.

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“…2f. 4) Penetration reinforcement to provide bond across the printed layers and available for full automation:  Pressing or shooting nails [24], short bars [25], [26], wire fibers [26] or staples [27] into printed layers; see Fig. 2g.…”

Section: Reinforcement Integration During Concrete Printingmentioning

confidence: 99%

Strategies for Integrating Reinforcement Into 3D Concrete Printing at the TU Dresden

et al. 2022

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3D concrete printing (3DCP) has all the chances to become the future of the construction industry, but this technology is not yet widely applicable. One of the main challenges still to be mastered is the difficulty of reinforcing printed structures. At this point, many reinforcement strategies have already been proposed, which are fully or partially capable of solving the problem. This publication provides first an overview of existing reinforcement strategies, classified according to the time of reinforcement introduction: before, during, or after 3D printing. Then the authors present the approaches developed at the TU Dresden and provide readers with information on new methods that still are in the development stage.

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Simultaneous Reinforcement of Concrete While 3D Printing

Cited by 15 publications

References 2 publications

Fresh and Hardened Properties of Extrusion-Based 3D-Printed Cementitious Materials: A Review

Fresh and Hardened Properties of Extrusion-Based 3D-Printed Cementitious Materials: A Review

3D Printed Formwork for Concrete: State-of-the-Art, Opportunities, Challenges, and Applications

Strategies for Integrating Reinforcement Into 3D Concrete Printing at the TU Dresden

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