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A platform for research: civil engineering, architecture and urbanism
A Compendious Rheo-Mechanical Test for Printability Assessment of 3D Printable Concrete
A successful 3D concrete print (3DCP) is controlled by a sound buildability and good pumpability. Since both factors rely on the behavior of concrete in the fresh state, rheological assessment is crucial prior to 3DCP. In a previous study done by Roussel [1], a correlation of numerical simulation of ASTM mini-slump cone flow and rheometer results was successfully addressed. As the model solely considers material flow under gravitational loading, this model can be adjusted with an external source of energy in the form of impact loading by vertical drop from a certain height to emulate the agitation and deposition process of 3DCP. A flow table and rheometer tests were executed with 5 samples of different consistency. Consecutively, 3DCP validation was performed except for the sample with no superplasticizer content. The study shows the relative deformation (%) varied in a range of 34% - 89% after the drops according to the consistency of the sample. The initial static and dynamic yield stresses are also presented in a range of 0.94–6.82 kPa and 0.54–4.73 kPa respectively. Based on the results, flow table reading ranges are suggested for suitable 3D printability.
A Compendious Rheo-Mechanical Test for Printability Assessment of 3D Printable Concrete
A successful 3D concrete print (3DCP) is controlled by a sound buildability and good pumpability. Since both factors rely on the behavior of concrete in the fresh state, rheological assessment is crucial prior to 3DCP. In a previous study done by Roussel [1], a correlation of numerical simulation of ASTM mini-slump cone flow and rheometer results was successfully addressed. As the model solely considers material flow under gravitational loading, this model can be adjusted with an external source of energy in the form of impact loading by vertical drop from a certain height to emulate the agitation and deposition process of 3DCP. A flow table and rheometer tests were executed with 5 samples of different consistency. Consecutively, 3DCP validation was performed except for the sample with no superplasticizer content. The study shows the relative deformation (%) varied in a range of 34% - 89% after the drops according to the consistency of the sample. The initial static and dynamic yield stresses are also presented in a range of 0.94–6.82 kPa and 0.54–4.73 kPa respectively. Based on the results, flow table reading ranges are suggested for suitable 3D printability.
A Compendious Rheo-Mechanical Test for Printability Assessment of 3D Printable Concrete
RILEM Bookseries
Bos, Freek P. (editor) / Lucas, Sandra S. (editor) / Wolfs, Rob J.M. (editor) / Salet, Theo A.M. (editor) / Cho, Seung (author) / Kruger, Jacques (author) / Bester, Frederick (author) / van den Heever, Marchant (author) / van Rooyen, Algurnon (author) / van Zijl, Gideon (author)
RILEM International Conference on Concrete and Digital Fabrication ; 2020 ; Eindhoven, The Netherlands
Second RILEM International Conference on Concrete and Digital Fabrication ; Chapter: 20 ; 196-205
RILEM Bookseries ; 28
2020-07-08
10 pages
Article/Chapter (Book)
Electronic Resource
English
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