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RE: lateral pressure on formwork

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The lateral pressure on formwork depends on the following parameters :

- the consistence of the concrete 
- the speed of filling the formwork with concrete
- the temperature of the fresh concrete
- use of vibrators and the deep 

If You increase the speed of filling up the formwork with concrete, the lateral 
pressure (hydrostatic) will increase too. The use of vibrators (no matter if they
are inside or outside of the formwork) will encrease the lateral pressure, so You
will need to calculate the pressure along the deep a vibrator is used, as if it 
was pressure caused by water only. The deep, where only the pressure from water 
is applied to the formwork directly depends upon the speed of filling the 
formwork with concrete.

Rico Harzer