방동제를 이용한 한중 콘크리트 개발 연구

Development of cold weather concrete by using do-icing agency

The concrete which has placed under cold weather has some defects such as the decrease of initial strength by hydration delay, strength unrecover at unhardened concrete freezing and structural failure and crack by expansion pressure. So, in this study, we tried to develope the concrete which can be made under cold weather without defect by using of do-icing agency In concrete test, the used do-icing agency has the characteristics of de-icing and rapid hydration. By test results, Co{$NH_{2}$$]_{2}$is unsuitable for workability, and NaN$O_{2}$ is the most suitable agency for cold weather. And for curing, the cured concrete at $21^{\circ}C$ for 24 hours has the safe strength.