Computers and Concrete

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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)
  • Received : 2014.09.02
  • Accepted : 2015.06.01
  • Published : 2015.06.25
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Abstract

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.

Keywords

Acknowledgement

Supported by : National Research Foundation of Korea (NRF)

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