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Fresh concrete pumping arrest investigation for thixotropy by a CFD modelling apporach

Robin De Schryver (UGent) , Khadija El Cheikh (UGent) , Mert Yücel Yardimci (UGent) , Karel Lesage (UGent) and Geert De Schutter (UGent)
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Abstract
Concrete pumping operations determine construction speed, finishing quality, durability and even structural integrity. When pumping operations cannot be continued, most problems occur due to complex time-dependent transformations. This causes significant industrial costs (e.g. material and delay). Since time-dependent aspects are currently not fully understood and cannot be predicted, a way to quantify time-dependent aspects is needed. Therefore, we make an attempt by numerical simulation by comparing thixotropic cases with different pumping arresting times. After an introduction to fresh concrete rheology and numerical modelling, ten representative thixotropy cases are analysed. Despite some unresolved numerical instabilities, the numerical framework allows to estimate pumping pressure peaks after resting time. The results evaluate a thixotropy model, which is generally applicable for less thixotropic SCC’s. It is clear that flow re-initiation after rest in concrete pumping is poorly understood. Numerical simulation could be one approach for further analysis and is potentially important for practice. Future work such as simulation of concrete mixers, pressure increase after pumping arrest, formwork pressure decay and leakage are therefore recommended.
Keywords
Fresh concrete, Thixotropy, Concrete pumping, Numerical CFD simulation

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MLA
De Schryver, Robin, et al. “Fresh Concrete Pumping Arrest Investigation for Thixotropy by a CFD Modelling Apporach.” Rheology and Processing of Construction Materials, RheoCon 2019, SCC9, edited by V. Mechtcherine et al., vol. 23, Springer, 2019, pp. 580–87.
APA
De Schryver, R., El Cheikh, K., Yardimci, M. Y., Lesage, K., & De Schutter, G. (2019). Fresh concrete pumping arrest investigation for thixotropy by a CFD modelling apporach. In V. Mechtcherine, K. Khayat, & E. Secrieru (Eds.), Rheology and processing of construction materials, RheoCon 2019, SCC9 (Vol. 23, pp. 580–587). Paris: Springer.
Chicago author-date
De Schryver, Robin, Khadija El Cheikh, Mert Yücel Yardimci, Karel Lesage, and Geert De Schutter. 2019. “Fresh Concrete Pumping Arrest Investigation for Thixotropy by a CFD Modelling Apporach.” In Rheology and Processing of Construction Materials, RheoCon 2019, SCC9, edited by V. Mechtcherine, K. Khayat, and E. Secrieru, 23:580–87. Paris: Springer.
Chicago author-date (all authors)
De Schryver, Robin, Khadija El Cheikh, Mert Yücel Yardimci, Karel Lesage, and Geert De Schutter. 2019. “Fresh Concrete Pumping Arrest Investigation for Thixotropy by a CFD Modelling Apporach.” In Rheology and Processing of Construction Materials, RheoCon 2019, SCC9, ed by. V. Mechtcherine, K. Khayat, and E. Secrieru, 23:580–587. Paris: Springer.
Vancouver
1.
De Schryver R, El Cheikh K, Yardimci MY, Lesage K, De Schutter G. Fresh concrete pumping arrest investigation for thixotropy by a CFD modelling apporach. In: Mechtcherine V, Khayat K, Secrieru E, editors. Rheology and processing of construction materials, RheoCon 2019, SCC9. Paris: Springer; 2019. p. 580–7.
IEEE
[1]
R. De Schryver, K. El Cheikh, M. Y. Yardimci, K. Lesage, and G. De Schutter, “Fresh concrete pumping arrest investigation for thixotropy by a CFD modelling apporach,” in Rheology and processing of construction materials, RheoCon 2019, SCC9, Dresden, 2019, vol. 23, pp. 580–587.
@inproceedings{8631242,
  abstract     = {Concrete pumping operations determine construction speed, finishing
quality, durability and even structural integrity. When pumping operations
cannot be continued, most problems occur due to complex time-dependent
transformations. This causes significant industrial costs (e.g. material and delay).
Since time-dependent aspects are currently not fully understood and cannot be
predicted, a way to quantify time-dependent aspects is needed. Therefore, we
make an attempt by numerical simulation by comparing thixotropic cases with
different pumping arresting times. After an introduction to fresh concrete rheology
and numerical modelling, ten representative thixotropy cases are analysed.
Despite some unresolved numerical instabilities, the numerical framework
allows to estimate pumping pressure peaks after resting time. The results
evaluate a thixotropy model, which is generally applicable for less thixotropic
SCC’s. It is clear that flow re-initiation after rest in concrete pumping is poorly
understood. Numerical simulation could be one approach for further analysis
and is potentially important for practice. Future work such as simulation of
concrete mixers, pressure increase after pumping arrest, formwork pressure
decay and leakage are therefore recommended.},
  author       = {De Schryver, Robin and El Cheikh, Khadija and Yardimci, Mert Yücel and Lesage, Karel and De Schutter, Geert},
  booktitle    = {Rheology and processing of construction materials, RheoCon 2019, SCC9},
  editor       = {Mechtcherine, V. and Khayat, K. and Secrieru, E.},
  isbn         = {9783030225650},
  issn         = {2211-0844},
  keywords     = {Fresh concrete,Thixotropy,Concrete pumping,Numerical CFD simulation},
  language     = {eng},
  location     = {Dresden},
  pages        = {580--587},
  publisher    = {Springer},
  title        = {Fresh concrete pumping arrest investigation for thixotropy by a CFD modelling apporach},
  url          = {http://dx.doi.org/10.1007/978-3-030-22566-7_67},
  volume       = {23},
  year         = {2019},
}

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