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Kim, Jae Hong
Research Group for Concrete Structures and Materials
Research Interests
  • Mechanics of Concrete, Rheology, Structural Analysis, Construction Performance
  • Rheological investigation for the flow of fresh concrete
  • Multiscale material characterization of suspension

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Sensitivity and accuracy for rheological simulation of cement-based materials

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Title
Sensitivity and accuracy for rheological simulation of cement-based materials
Author
Kim, Jae HongJang, Hye RimYim, Hong Jae
Issue Date
2015-06
Publisher
TECHNO-PRESS
Citation
COMPUTERS AND CONCRETE, v.15, no.6, pp.903 - 919
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
URI
https://scholarworks.unist.ac.kr/handle/201301/16564
URL
http://121.183.206.200:8080/proto.board/abstractArticleContentView?page=article&journal=cac&volume=15&num=6&ordernum=3&site=korsc
DOI
10.12989/cac.2015.15.6.903
ISSN
1598-8198
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