| Title |
Effect of Maintaining Time of Formwork on Strength and Dry Shrinkage of Mock-up Concrete in Cold Weather Condition |
| Authors |
Cho, Han-Byung ; Kim, Hak-Young ; Lee, Young-Do ; Jung, Sang-Jin |
| Keywords |
Cold Weather Condition ; Ply Wood Panels Form ; Removal Time of Form |
| Abstract |
This study examined the strength and durability of Mock-up concrete members according to the maintaining time of concrete form after concrete placement in winter season. Existing related research targets estimation of demolding and reducing the construction time due to low temperatures in winter, but atmospheric dry conditions as well as low temperatures need to be considered. The low temperatures and dry climate evaporate moisture on the surface of concrete members rapidly, so defects like cracks and reduced durability on the surface of the concrete members at the early time of curing with not enough hydrated condition may occur. As a result of the experiment of strength properties according to the maintaining time of 6 individual concrete forms by time differences, it shows low intensity and dynamics characteristics in the long-term concrete age as well as the initial age in case of Mock-up members demolded after 18 hours and 24 hours after placement. It is considered that the form protects concrete from the lateral pressure and external environmental factors until it is cured, and maintains the effect of insulation and watertight. |