Compaction on Concrete
The handling and condensation is interdependent and carried out simultaneously. They are most important for the purpose of ensuring the strength, imperviousness and durability requirements of hardened concrete in the actual structure. As far as placing is concerned, the main purpose is to freeze the concrete close to its final position so that isolation can be avoided and the concrete can be fully compacted. The purpose of having good concrete can be stated quite simply.
This is to get the concrete in position in a motion, and in one position, which allows it to compact properly. The following rules should be kept in mind to get the proper shape: Concrete should be laid in equal layers and not in large heaps or sloping layers. The thickness of the layer must be consistent with the method of vibration so that the entrained air can be removed. Under each layer. The holding rate and compaction must be equal. If you move too slowly, the mixture may harden so that it is not sufficiently workable. Water should never be poured into concrete on any account. On the other hand, if you go too early, you can overtake the compacting gang, making it impossible for them to do their job properly. Each layer must be fully compacted before placing the next one, and each subsequent layer must be placed, while the underlying layer is still plastic so as to achieve unbroken construction. Collisions between concrete and formwork or reinforcement should be avoided. For deep sections, a long down pipe ensures the accuracy of the location of the concrete and minimal separation. You should be able to see that the keep is moving correctly, so light should be available for larger darker sections, and thinner walls and columns. The concrete is laid, ready to be compacted. The purpose of condensation is to get rid of air vessels that are trapped in loose concrete.
It is important to fully compact the concrete because: Air voids reduce the strength of the concrete. For every 1% of trapped air, the strength falls from somewhere between 5 and 7%. This means that concrete with only 5% of air vessels can lose up to a third of their strength due to incomplete condensation. Increases the permeability of wired concrete. This in turn reduces its durability. If the concrete is not compact and impermeable, it will not be watertight. It will be less able to withstand aggressive iquids and its exposed surface will be severely eroded. Moisture and air reinforcement are more likely to penetrate, causing it to rust. Air deformation attenuates contact between the mixture and reinforcement (and, in fact, any other embedded metals). The required bond will not be achieved and the reinforcing member will not be as strong as it should be. Wired strom produces blocks on surfaces. For example, jerks and hives may occur. There are two methods for condensation including: vibrator by vibrator or by using tamping rods.
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