Cold weather concrete - Cold weather concrete

Japanese: 寒中コンクリート - かんちゅうこんくりーと
Cold weather concrete - Cold weather concrete

...There are various types of curing methods, such as sprinkling water on the concrete surface, pouring water on it, or covering the concrete surface with wet mats or wet sand, film curing, which covers the concrete surface with a film curing agent to prevent water evaporation, and steam curing, which uses high-temperature steam. In order to reach 70% of the 28-day strength, it takes about 4 to 14 days for ordinary cement and 3 to 7 days for early-strength cement when using wet curing. Cement reinforced concrete [Shigeyoshi Nagataki]
[Types of concrete]
Cold weather concrete is classified according to the temperature at the time of construction, and refers to concrete that is constructed when there is a risk of the concrete freezing during the curing period after pouring. The hydration reaction between water and cement slows down at low temperatures, and if the concrete freezes (-0.5 to -2.0°C), not only will the hydration not progress, but the quality of the finished product will also deteriorate significantly.

*Some of the terminology that refers to "cold weather concreting" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…養生方法の種類には,コンクリート表面に散水したり,水を張ったり,あるいはぬれむしろや湿った砂でコンクリート表面を覆う湿潤養生,被膜養生剤でコンクリート表面を覆って水分の蒸発を防ぐ膜養生,高温蒸気を用いる蒸気養生などがあり,28日強度の70%の強度に達するには,湿潤養生の場合は普通セメントで4~14日,早強セメントで3~7日ほどの期間を必要とする。セメント鉄筋コンクリート【長滝 重義】
【コンクリートの種類】
寒中コンクリートcold weather concreting施工時の温度による分類で,打込み後,養生期間内にコンクリートが凍結するおそれがある場合に施工されるコンクリートのこと。水とセメントとの水和作用は低温になると緩慢になり,コンクリートが凍結(-0.5~-2.0℃)した場合は,水和作用が進まないばかりでなく,でき上がった製品の質も著しく劣化する。…

※「寒中コンクリート」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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