How to achieve the best dehydration effect

The factors affecting the degree of vacuum are also the sealing conditions of the suction pad and the concrete surface. Therefore, before dewatering starts, the suction pad should be carefully sealed around, and no leakage of the suction pad is allowed. At the same time, the suction pipe and the vacuum pump should be inspected for sealing. No leakage can occur. Otherwise, a good degree of vacuum cannot be achieved and the vacuum dehydration effect will be reduced. When covering nylon cloth and suction pads, care must be taken not to have the phenomenon that the edge concrete is not covered by the suction pads. Otherwise, it will not only affect the degree of vacuum, but also affect the dewatering of the concrete at the edge, resulting in different dehydration of the concrete, thus affecting the overall quality of the concrete. .

The dehydration time is generally related to the degree of vacuum, the ratio of raw water to cement, the strength of concrete, the type of cement, and the mix ratio of concrete. It is also one of the main parameters of the vacuum dewatering process construction effect. In general, the vacuum degree is large, the dehydration time is short, the original water-cement ratio is large, and the dehydration time is longer. At the same time, the dehydration time is also related to the construction conditions, the air humidity is high, and the dehydration time is long. Therefore, in the actual construction, it is necessary to determine the dehydration time according to the mix ratio and strength of the concrete at the time of construction, the type of cement, the degree of vacuum, etc., and also to adjust reasonably according to the natural conditions during construction.

Only when the dehydration time is at a certain optimal time can the best dehydration effect be achieved. Longer dewatering time will affect the flow process of various processes, and it will also affect the quality of concrete; the dehydration time is short, and the purpose of complete dehydration cannot be achieved. According to the experience summarised in the construction, the general dehydration time can be judged by the following method: After dehydration, the concrete is standing on its surface with both feet without indentation (usually within 2mm of the impression).

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