Concrete Dam is to make concrete mixture is dense, inner without voids, the outer surface is not porous, and make grip the concrete reinforcement. Requirements of the dress is to dress carefully, do not miss any time and ensure, if not compacted enough time, the concrete is not compacted, not hollow, hole. Conversely, if the dress is too long, the concrete will loose out, to be settled to gravel, cement mortar will emerge on the concrete will not be uniform
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