On the hardened surface of the concrete, cement film, movable stones and concrete laitance should be cleared.The surface should also be wetted and cleansed, no water pools are to be found.

• 在已硬化的砼表面上，应清除水泥薄膜和松动石子以及砼浮浆，并充分湿润和冲洗干净，且不得积水。