Curing of concrete shall comply with the requirements

Concrete curing precast concrete batching plant should meet the requirements? 
(1) is appropriate straw, straws, etc. in the batch plant concrete before the final setting a daily cap on the surface of the concrete slab should be uniform watering, keep moist state;
(2) the temperature difference between day and night areas, concrete slabs should be taken within three days later after pouring precautionary measures to prevent shrinkage cracks in the concrete slab;
(3) concrete slab in front during conservation and caulk should be closed to traffic, after reaching 40% of the design strength before allowing people to access;
(4) curing time should be based on the growth in the strength of concrete, are generally appropriate for the 14-21 days before the expiration of the conservation cover cleared, the board shall not leave traces.