| Project/Area Number |
18360210
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Civil engineering materials/Construction/Construction management
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| Research Institution | Kochi University of Technology |
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Principal Investigator |
OUCHI Masahiro Kochi University of Technology, Faculty of Engineering, Associate Professor (80301125)
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| Project Period (FY) |
2006 – 2007
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| Project Status |
Completed (Fiscal Year 2007)
|
| Budget Amount *help |
¥8,070,000 (Direct Cost: ¥7,200,000、Indirect Cost: ¥870,000)
Fiscal Year 2007: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2006: ¥4,300,000 (Direct Cost: ¥4,300,000)
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| Keywords | self-compacting concrete / pumping / shear stress / superplasticizer / adsorption / relative surface area / change in flowability / 自己充填モルタル / 流動性 / セメント粒子の分散と凝集 / セメント粒子の表面積 / フレッシュモルタル / 変形性低下 |
|---|
| Research Abstract |
The mechanism for the reduction in the flowability of fresh mortar of self-compacting concrete was clarified. The main cause for the reduction in the flowability due to pumping was shear stress generated in the mortar rather than the compressive stress. Shear stress dispersed the coagulated particles of cement and that resulted in higher amount of free water and less amount of supeiplasticizer adsorbed to the unit surface area of the particles of cement. That led to lower viscosity and deformability ofthe fresh mortar. The degree ofthe reduction in the viscosity and defonnability ofthe mortar was affected by the water to cement ratio and the initial mixing energy.
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