(1), concrete should be kept warm and moist as soon as possible after pouring, and the concrete should be cured immediately after receiving light, and the concrete surface should be covered with plastic sheets.

Material film,

Strengthen heat preservation and moisture retention after concrete pouring,

Where conditions permit, water can be added to the damp-proof cloth to strengthen moisture retention and heat preservation.

Guard. Thermal insulation and moisture maintenance is a good way to prevent sand and cracks on concrete pavement, and the maintenance time should not be less than 7 days.

(2) When the concrete surface has considerable hardness, it is generally lightly pressed with fingers without leaving any trace, and it can also be covered with wet straw mats or wet sacks. When spraying water for maintenance, it should be noted that water cannot be directly poured on the concrete surface. When encountering heavy rain or strong wind, it should be covered with wet straw mats in time. A special person sprinkles water regularly every day to keep the straw mat or sack wet. The 5-day strength of concrete mixed with water reducer can reach above 80%. At this time, the straw mat, plastic film or wet sack can be removed, and after it is released, it still needs to be watered for 2 ~ 3 days.