4.3.4 concrete Dam: The concrete dam must ensure the following requirements:-Can use different swamp types, but must make sure after the dam, concrete is compacted and not disability.-Time dam at each location must ensure in concrete is compacted. Signs to know the concrete was compacted is: cement slurry surfacing and air bubbles no longer half.-When using intermittent punching, punching, lagoon's move does not exceed 1.5 times the secret sale of holding effects must be plugged into the concrete layer was poured before is 10 cm.-For column: in addition to using intermittent punching, must use a rubber hammer to type up the outer surface of formwork concrete in order to avoid being pitted surface.
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