Ohkawase dam is a gravity dam of concrete volume approximately 110000 m
3. As the technical specification requires that the temperature of placing concrete shall be below 25°C, so we adopted the pre-cooling method in the summer time, in which Liquefied Nitrogen (LN
2) is injected to the concrete. By applying this method, we placed the concrete of 12000m
3. This paper describes the plans and the results of consideration relating to the concreting which adopts the pre-cooling method.
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