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| liquid nitrogen concreting |
1) In hot weather, (temperature of surrounding higher than 40 C) concrete shall be transported in deep containers to reduce the loss of water due to evaporation
and the same method for transport shall be adopted in cold weather ( temperature of the surrounding lower than 15 C) to reduce heat loss.
2) In hot weather, work shall be restricted to the cooler parts of the day. The formwork shall be continuously sprayed with cold water in advance of actual concreting. Excess water shall be removed from inside of forms, just prior to the concrete placement.
3) The reinforcement and formwork, if metal forms are used, shall be protected from the effects of hot winds and direct sunlight.
4) The concrete shall have a temperature not higher than 40 C when placed. This shall be achieved by making use of chilled mixing water, flaked ice or by spraying water on the coarse aggregate (pre-cooled aggregates) or both, and if necessary by covering the container in which the concrete is transported to the site by wet Hessian cloth.
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