| 種別 | paper |
| 主題 | Surface Resistance and Pressure Distribution of High Fluidity Concrete |
| 副題 | |
| 筆頭著者 | Craig HANNAH（Nihon Cement Co） |
| 連名者1 | Hiromi FUJIWARA（Nihon Cement Co） |
| 連名者2 | Yoshihide SHIMOYAMA（Nihon Cement Co） |
| 連名者3 | Akito DOUZONO（Nihon Cement Co） |
| 連名者4 | |
| 連名者5 | |
| キーワード | |
| 巻 | 15 |
| 号 | 1 |
| 先頭ページ | 1223 |
| 末尾ページ | 1228 |
| 年度 | 1993 |
| 要旨 | INTRODUCTION Although High Fluidity Concrete, HFC, has the ability to fill a form without vibration, there is a limit to its performance. The factors affecting its filling ability include surface resistance and deformational resistance--around corners and reinforcement. To predict the flowing potential of HFC it is necessary to quantify its limiting factors. In this study, the surface resistance of HFC and the pressure distribution in various form configurations was measured (reinforcement was not included in this study).If the pressure loss attributable to surface resistance is subtracted from the total pressure loses then the remainder is due to deformational resistance. It may be possible to predict the filling potential from the surface resistance yield value, the latter being a measure of static state deformational resistance. CONCLUSIONS 1) Surface resistance of HFC on a vertical surface is more flowing in nature than the slipping usually observed with ordinary concrete.2) Surface resistance increases with Xv, and with surface roughness and softness; while release agent and increased HF dosage have little effect. 3) Further study is required to determine the nature of the relationship between Xv and concrete yield value for HFC. 4) For self-compacted HFC, the maximum difference between lateral pressure and the hydrostatic head is twice the yield stress. 5) For a static condition, the total pressure head loss can be calculated from the surface friction and deformational resistance at corners. 6) HFC is segregation resistant; but in areas of perturbed flow, a local increase in Xv, and thereby τf, may severely reduce flowing potential. |
| PDFファイル名 | 015-01-1208.pdf |