Concrete containment

1, the more cement, the faster the solidification, the hardened concrete. Therefore, with rich concrete containment, the required thickness can be thinner than when using a lean concrete. But cement is too much, also can reduce the strength of the concrete. In order to improve the early concrete hardness block, can stir flocculant in cement, such as calcium chloride, hydrochloric acid, sodium carbonate and sodium silicate lamp. 
 
2, concrete mixing and tremie: spread a layer of sand on the tablet first, and then spread a layer of cement, while dry mixing fully, and gravel, water, and stir thoroughly after 5 times with a spade, quickly into the bucket (or bag), underwater applications. Divers open barrels of live bottom or untie the knot on the bag, if no false bottom, carefully will back barrels, concrete casting in plugging are needed, finally with the hand gently smooth concrete surface and avoid loss of mortar, in case of serious impact on the quality of concrete. After the concrete casting, such as found a gap, with wooden wedge, cotton stuffing is of no effect. Appropriate where the loss of the crack, and finishing, to remove dirt, or loose materials, and placing of concrete. 
 
3, concrete containment considerations, in order to protect the concrete is not washed away by water, not frozen concrete cannot force or by running water flushing, contact with the concrete of hull steel rust, oil and waste, must be thoroughly cleared, the best wash to metallic luster, if can in some hook steel sheet metal welding is better; Pouring concrete parts, usually to walls, walls multi-purpose wooden pool useful bag filled with sand or concrete pile; To all the concrete continuously pour out a complete, if not a complete, must be separated with plate, section construction, make paragraphs can reliably connected; In the big hole or bending force, pulling force and vibration of local plugging, must according to the situation, increasing the thickness of the concrete or add in concrete steel bar, steel wire or on the concrete supporting pillar, shall be reinforced.