In order to ensure that the newly poured concrete has suitable hardening conditions and prevent cracks caused by early dehydration and drying shrinkage, after mass concrete is poured, it should be covered with water for curing within 12h.
(1) The curing time of concrete mixed with ordinary portland cement shall not be less than14d; The curing time of concrete mixed with slag cement, pozzolanic cement, dam cement and slag dam cement shall not be less than 21d. At the same time, it must be noted that the curing time of concrete in dry and hot weather should not be less than 28d if it is cured in high temperature season.
(2) Different concrete curing methods should be selected in different construction seasons. In summer, straw curtain can be used for covering, storing water, sprinkling water or spraying water for maintenance. This method is what we often call cooling maintenance. When the temperature is low, it can be covered with straw bags or sprayed with health care liquid for maintenance.
In winter construction, due to the low temperature, thermal insulation materials can generally be used to improve the surface and surrounding temperature of newly poured concrete and reduce the temperature difference between inside and outside concrete. You can also use sealing materials such as film curing liquid and plastic film to seal the excess mixing water in concrete, so as to realize the self-curing of concrete, which is what we often call heat preservation and curing. It should be emphasized that if the film-forming curing liquid is used, the curing liquid that can form a good film at low temperature should be selected. The curing liquid should be painted evenly, and it is best to paint vertically each other twice, especially at the corners. When the area is large, agricultural sprayers can be used for spraying.
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