Adequate protection of concrete against frost damage is essential for processing and curing the first period, provided that, within this period may occur at temperatures below 4 ° C .
Concrete, at the time of being placed in the formwork, shall have a temperature not lower than 21 ° C and no greater than 38 ° C . It will be maintained at a temperature of not less than 21 ° C for three days or 10 ° C for five days for normal portland cement concrete and least 21 ° C for two days 10 ° C for three days for portland cement concrete with high initial strength. The methods of protection and curing shall prevent the evaporation of moisture from the concrete and damage the surface.
concreted After each section of the structure will be fully protected or covered to ensure the maintenance of specified temperatures. The protection is maintained throughout the curing period indicating specifications, except those portions that such protection may be withdrawn temporarily to facilitate the collection of forms for concrete columns, ensuring that responses are immediately after such transaction is made.
The concrete will protect the concrete slabs between floors immediately after placement by tarpaulins, trestles or other structures, so that only a small area of \u200b\u200bthe completed slab is exposed to the external atmosphere given time. These tarpaulins are arranged so that hot air can circulate freely downstairs in the space between the freshly placed concrete and canvas, will be temporary holes in the slab and formwork thus facilitating the movement of hot air. These holes are made in the center of the panels and Source: CETArq
