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A platform for research: civil engineering, architecture and urbanism
Technologies for improving buildability in 3D concrete printing
https://orcid.org/0000-0003-1811-9491
https://orcid.org/0000-0001-8055-8167
Abstract Buildability is the ability to 3D print by adding concrete layer by layer continuously to the required level without significant deformation or collapse of the freshly printed component. This paper presents a systematic review of the reported studies to improve the buildability of concrete. The paper also presents original concepts and some results for improving the buildability of geopolymer concrete. Two methods to enhance the buildability are discussed: (1) Additives during initial mixing of concrete (2) Buildability enhancement at the print-head by an intervention (set-on-demand). The former method is the most widely studied, however, it affects the pumpability. The latter includes mixing accelerators, heating, ultrasonication, or magnetorheological control, performed at the print-head to rapidly increase the yield strength of the material immediately prior to extrusion. This method does not affect the pumpability of the mix until it reaches the print-head. Finally, the prospects of a new set-on-demand method are presented.
Highlights Buildability enhancement is achieved by interventions at initial mixing and at the print head. Strength development in fresh concrete is due to re-flocculation (physical) and setting (chemical). Enhancement at initial mixing is constrained by the pumpability limitations. Most developed set-on-demand approach is by mixing accelerators at the print-head. Similar approach to attain on demand setting of geopolymer concrete is discussed in detail.
Technologies for improving buildability in 3D concrete printing
https://orcid.org/0000-0003-1811-9491
https://orcid.org/0000-0001-8055-8167
Abstract Buildability is the ability to 3D print by adding concrete layer by layer continuously to the required level without significant deformation or collapse of the freshly printed component. This paper presents a systematic review of the reported studies to improve the buildability of concrete. The paper also presents original concepts and some results for improving the buildability of geopolymer concrete. Two methods to enhance the buildability are discussed: (1) Additives during initial mixing of concrete (2) Buildability enhancement at the print-head by an intervention (set-on-demand). The former method is the most widely studied, however, it affects the pumpability. The latter includes mixing accelerators, heating, ultrasonication, or magnetorheological control, performed at the print-head to rapidly increase the yield strength of the material immediately prior to extrusion. This method does not affect the pumpability of the mix until it reaches the print-head. Finally, the prospects of a new set-on-demand method are presented.
Highlights Buildability enhancement is achieved by interventions at initial mixing and at the print head. Strength development in fresh concrete is due to re-flocculation (physical) and setting (chemical). Enhancement at initial mixing is constrained by the pumpability limitations. Most developed set-on-demand approach is by mixing accelerators at the print-head. Similar approach to attain on demand setting of geopolymer concrete is discussed in detail.
Technologies for improving buildability in 3D concrete printing
https://orcid.org/0000-0003-1811-9491
https://orcid.org/0000-0001-8055-8167
Abstract Buildability is the ability to 3D print by adding concrete layer by layer continuously to the required level without significant deformation or collapse of the freshly printed component. This paper presents a systematic review of the reported studies to improve the buildability of concrete. The paper also presents original concepts and some results for improving the buildability of geopolymer concrete. Two methods to enhance the buildability are discussed: (1) Additives during initial mixing of concrete (2) Buildability enhancement at the print-head by an intervention (set-on-demand). The former method is the most widely studied, however, it affects the pumpability. The latter includes mixing accelerators, heating, ultrasonication, or magnetorheological control, performed at the print-head to rapidly increase the yield strength of the material immediately prior to extrusion. This method does not affect the pumpability of the mix until it reaches the print-head. Finally, the prospects of a new set-on-demand method are presented.
Highlights Buildability enhancement is achieved by interventions at initial mixing and at the print head. Strength development in fresh concrete is due to re-flocculation (physical) and setting (chemical). Enhancement at initial mixing is constrained by the pumpability limitations. Most developed set-on-demand approach is by mixing accelerators at the print-head. Similar approach to attain on demand setting of geopolymer concrete is discussed in detail.
Technologies for improving buildability in 3D concrete printing
Muthukrishnan, Shravan (author) / Ramakrishnan, Sayanthan (author) / Sanjayan, Jay (author)
2021-06-16
Article (Journal)
Electronic Resource
English
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