Computers and Concrete

  • 제15권6호
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  • Pages.903-919
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  • 2015
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  • 1598-8198(pISSN)
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  • 1598-818X(eISSN)
테크노프레스 (Techno-Press)
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DOI QR코드

DOI QR Code

Sensitivity and accuracy for rheological simulation of cement-based materials

  • Kim, Jae Hong (School of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology) ;
  • Jang, Hye Rim (School of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology) ;
  • Yim, Hong Jae (Department of Construction and Disaster Prevention Engineering, Kyungpook National University)
  • 투고 : 2014.09.02
  • 심사 : 2015.06.01
  • 발행 : 2015.06.25
⟨ 이전 논문 다음 논문 ⟩

초록

The flow of freshly mixed cement-based material shows thixotropy, which implies some difficulties on robust measurement of its rheological properties: The flow curve of thixotropic materials depends on the used protocol. For examples, higher viscosity is obtained when the rate of shear strain is more quickly increased. Even though precise measurement and modelling of the concrete rheology needs to consider the thixotropic effect, engineers in the concrete field prefer considering as a non-thixotropic Herschel-Bulkley fluid, even more simply Bingham fluid. That is due to robustness of the measurement and application in casting process. In the aspect of simplification, this papers attempts to mimic the thixoropic flow by the non-thixotropic Herschel-Bulkley model. Disregarding the thixotropy of cement based materials allows us to adopt the rheological concept in the field. An optimized protocol to measure the Bingham parameters was finally found based on the accuracy and reproducibility test of cement paste samples, which minimizes the error of simulation stemming from the assumption of non-thixotropy.

키워드

과제정보

연구 과제 주관 기관 : National Research Foundation of Korea (NRF)

참고문헌

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피인용 문헌

  1. Correlation between Channel-Flow Test Results and Rheological Properties of Freshly Mixed Mortar vol.17, pp.7, 2016, https://doi.org/10.5762/KAIS.2016.17.7.237
  2. Critical Grain Size of Fine Aggregates in the View of the Rheology of Mortar vol.11, pp.4, 2017, https://doi.org/10.1007/s40069-017-0217-4
  3. Effect of Admixtures on the Yield Stresses of Cement Pastes under High Hydrostatic Pressures vol.9, pp.12, 2016, https://doi.org/10.3390/ma9030147
  4. Evaluation on the consumption and performance of polycarboxylates in cement-based materials vol.158, 2018, https://doi.org/10.1016/j.conbuildmat.2017.10.004
  5. Rheology of cement paste under high pressure vol.77, 2017, https://doi.org/10.1016/j.cemconcomp.2016.11.007
  6. Rheological properties considering the effect of aggregates on concrete slump flow vol.50, pp.6, 2017, https://doi.org/10.1617/s11527-017-1104-9
  7. Rheological Method for Alpha Test Evaluation of Developing Superplasticizers’ Performance: Channel Flow Test vol.2017, 2017, https://doi.org/10.1155/2017/4214086
  8. Visualization of Concrete Slump Flow Using the Kinect Sensor vol.18, pp.3, 2018, https://doi.org/10.3390/s18030771
  9. Prediction of concrete casting in steel-plate concrete panels vol.52, pp.1, 2019, https://doi.org/10.1617/s11527-019-1323-3
  10. Control of Viscosity of Cementitious Materials Using Waste Limestone Powder vol.13, pp.1, 2015, https://doi.org/10.1186/s40069-018-0325-9
  11. First step in modeling the flow table test to characterize the rheology of normally vibrated concrete vol.152, pp.None, 2015, https://doi.org/10.1016/j.cemconres.2021.106678