| 作成者 |
|
|
|
|
|
|
|
|
|
|
|
|
|
| 本文言語 |
|
| 出版者 |
|
|
|
| 発行日 |
|
| 収録物名 |
|
| 巻 |
|
| 開始ページ |
|
| 終了ページ |
|
| 出版タイプ |
|
| アクセス権 |
|
| JaLC DOI |
|
| 概要 |
Since the hydration reaction of concrete is more rapid in hot weather environment, extra care must be taken with placement to avoid cold joint. Especially in case of the vertical members such as walls... and columns, it should be assured the early intervals of concrete placing time for consolidation with the previous concrete. Therefore, this study was conducted to investigate the effect of concrete placing time and interval of vertical members affecting the development of the cold joint under hot weather environment. As experimental factors of this mockup test, concrete placing time was set 0.5 and 1.5 hours, and the intervals of concrete placing time was set at 1, 2 and 3 hours. Experiment results indicate that the bleeding is finished after 2 hours, the concrete surface becomes dried state rapidly and the hydration reaction was very fast in the hot weather condition. When approaching from the experimental factors, intervals of placing time was a dominant influence on the air permeability coefficient compared with concrete placing time. If proposed the air permeability coefficient in 10（× 10^-16m^2) or less for quality control in respect of cold joint under hot weather environment, later concrete should be poured within 2 hours. Additionally, in the scope of this experiment, 1.0N/mm^2of Proctor penetration resistance and 50～60mm of N-type penetration depth can suggest a limits of placing time of later concrete続きを見る
|
Mendeley出力
