期刊
COMPUTERS AND CONCRETE
卷 15, 期 6, 页码 903-919出版社
TECHNO-PRESS
DOI: 10.12989/cac.2015.15.6.903
关键词
cement paste; suspension; thixotropy; rheology; flow simulation; VOF techniques
类别
资金
- National Research Foundation of Korea (NRF) - Ministry of Education, Science and Technology [NRF-2015R1A1A1A05001382]
- National Research Foundation of Korea [2015R1A1A1A05001382] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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.
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