Rheological Property Criteria for Buildable 3D Printing Concrete
Autor: | Seong Tae Yi, Seung-Ho Choi, Kang Su Kim, Lee Yoon-Jung, Hoseong Jeong, Sun-Jin Han |
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Jazyk: | angličtina |
Rok vydání: | 2019 |
Předmět: |
0211 other engineering and technologies
3D printing 02 engineering and technology Computational fluid dynamics lcsh:Technology Article Rheology 021105 building & construction Shear stress General Materials Science Transformation equation lcsh:Microscopy Mathematics lcsh:QC120-168.85 mixture design lcsh:QH201-278.5 business.industry lcsh:T Structural engineering 021001 nanoscience & nanotechnology lcsh:TA1-2040 Hardening (metallurgy) concrete rheology lcsh:Descriptive and experimental mechanics lcsh:Electrical engineering. Electronics. Nuclear engineering buildability 0210 nano-technology business lcsh:Engineering (General). Civil engineering (General) lcsh:TK1-9971 |
Zdroj: | Materials, Vol 12, Iss 4, p 657 (2019) Materials Volume 12 Issue 4 |
ISSN: | 1996-1944 |
Popis: | Fresh concrete used in 3D printing should ensure adequate yield stress, otherwise the printed concrete layer may suffer intolerable deformation or collapse during the printing process. In response to this issue, an analytical study was carried out to derive the initial yield stress and hardening coefficient of fresh concrete suitable for 3D printing. The maximum shear stress distribution of fresh concrete was calculated using a stress transformation equation derived from the equilibrium condition of forces. In addition, the elapsed time experienced by fresh concrete during the printing processes was estimated and was then substituted into the elapsed time-yield stress function to calculate the yield stress distribution. Based on these results, an algorithm capable of deriving both the initial yield stress and the hardening coefficient required for printing fresh concrete up to the target height was proposed and computational fluid dynamics (CFD) analyses were performed to verify the accuracy of the proposed model. |
Databáze: | OpenAIRE |
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