| 種別 | paper |
| 主題 | A Study on Velocity of Deformation of Super Workable Concrete |
| 副題 | |
| 筆頭著者 | Somnuk TANGTERMSIRIKUL（Taisei Corporation） |
| 連名者1 | Yasunori MATSUOKA（Taisei Corporation） |
| 連名者2 | Takefumi SHINDOH（Taisei Corporation） |
| 連名者3 | Jun SAKAMOTO（Taisei Corporation） |
| 連名者4 | |
| 連名者5 | |
| キーワード | |
| 巻 | 14 |
| 号 | 1 |
| 先頭ページ | 1161 |
| 末尾ページ | 1166 |
| 年度 | 1992 |
| 要旨 | INTRODUCTION Intensive studies on deformability and segregation resistance of concrete have been carried out for a purpose of developing a high performance concrete with high filling ability. The concrete requires no vibration to fill all corners and spaces in the formwork. However, two concrete mixtures which are judged by a no-consolidation filling test, for example U-shaped filling test to have equal filling ability, may fill a specified formwork at different speed. The process of filling takes time, even though the concrete can fill the formwork perfectly, if the concrete is relatively high in viscosity. This problem occurs since the velocity of deformation is not taken into consideration. The velocity of deformation is essential especially when the speed of construction is concerned. The concrete which has excellent filling ability but takes long time to complete filling is not considered appropriate in practice. It was then regarded that velocity of deformation is one of the parameter which has to be considered in the quality control of the concrete. In this paper, a method for evaluating the velocity of deformation of super workable concrete was proposed. The super workable concrete here is defined as those which can not be measured the deformability by slump value but by diameter of slump flow. The idea is to propose a method which is simple to carry out and requires no complicated instrument so that it can be applied to the quality control of the concrete at manufacturing as well as at construction. CONCLUSIONS The following conclusions can be drawn on the basis of the content of this study. 1. A method for evaluation of velocity of deformation of super workable concrete was propose by adopting the slump flow test. 2. The velocity of deformation was defined as the average velocity of deformation measured from 40cm to 60cm of the concrete flow. 3. The velocity of deformation decreases with the increase of amount of viscosity agent even though the amount of superplasticizer was increased to obtain mixtures with maximum filling ability for each content of viscosity agent. 4. The velocity of deformation decreases with the increase of time after mixing. 5. There is a correlation between velocity of deformation of the concrete and viscosity of the corresponding mortar. 6. There is a good linear correlation between the v50 which was defined as the secant velocity of deformation at slump flow of 50cm and the average velocity of deformation, vav. Therefore, the v50 was utilized as the simple parameter for evaluating velocity of deformation in our study. |
| PDFファイル名 | 014-01-1201.pdf |