| 種別 | Paper |
| 主題 | WORKABILITY CHARACTERISTIC OF FRESH CONCRETE MIXED AND AGITATED IN HIGH TEMPERATURE AMBIENCE |
| 副題 | |
| 筆頭著者 | Yasunori MATSUFUJI |
| 連名者1 | Victor SAMPEBULU |
| 連名者2 | Takaaki OHKUBO |
| 連名者3 | Shizuo HARADA |
| 連名者4 | |
| 連名者5 | |
| キーワード | |
| 巻 | 10 |
| 号 | 2 |
| 先頭ページ | 813 |
| 末尾ページ | 818 |
| 年度 | 1988 |
| 要旨 | INTRODUCTION The concrete that is mixed and agitated at a high ambient temperature tends to give rise to defects such as reduced workability, and diminishable strength and potential occurrence of cracks in long-term aging. In this view, many of the concrete work specification of provide requirements for works to be performed in high temperature ambiences. However, in many cases no specific term for which such requirements be applied is defined due to lack of a unified criterion. This study was carried out with the aim of explicating workability particularly in term of slump of the fresh concrete that is mixed and transported in various high temperature ambiences. Results of our experiments to determine effect of high ambient temperature on the workability of fresh concrete, Which were conducted in the same manner as those being practiced in some ready-mixed concrete plants are discussed in this paper. CONCLUSION Some effect of the high temperature ambience on the fresh concrete at various temperature levels was studied. This paper also described the relation between the concrete temperature and the workability in terms of slump. Further, in view of a significant impact of the concrete-placing temperature on resulted strength after curing, a formula for estimating concrete-placing temperature was determined taking such factors into consideration as ambient temperature and duration of agitation throughout the transport period. The achievement as described in this paper may be of use for quality control, including strength control in particular, of concrete to be placed in high temperature ambiences. |
| PDFファイル名 | 010-01-1145.pdf |