Elucidation of essential rheological property of Bingham fluid based on the focal point formation among flow curves of fresh cementitious materials
| Project/Area Number |
15K14011
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Civil engineering materials/Construction/Construction management
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| Research Institution | The University of Tokyo |
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Principal Investigator |
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| Project Period (FY) |
2015-04-01 – 2017-03-31
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| Project Status |
Completed (Fiscal Year 2016)
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| Budget Amount *help |
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2015: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
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| Keywords | コンクリート / フレッシュ / レオロジー / ビンガム流動 / 流動曲線 / 焦点 / 流動速度分布 / 二次関数 / 流動 / 塑性粘度 / 単純ずり |
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| Outline of Final Research Achievements |
It is known that rheological property of fresh cement mortar with superplasticizer shows Bingham fluid character which has plastic viscosity and yielding value. It is also found that the linear shear strain and shear stress relationship of these Bingham fluids which have different plastic viscosities due to different dosage of superplasticizer cross and form clear focal point in the third quadrant. In this research it was found that this focal point shifts linearly according to the dynamic change between local shear strain and apparent one. Consequently, it is hypothesized that the position of focal point on its locus is changed according to clearance between rotor and outer wall of the rotating viscometer. Further, detailed data of non-linear flow rate distribution in space detected by MRI in the published literatures were analyzed in this research and it was found that they can be clearly represented by quadratic function or cubic one.
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Report
(3 results)
Research Products
(5 results)
