Thursday, August 18, 2011

Placing concrete underwater

Sometimes concrete needs to be placed underwater.In this case bottom dump bucket or tremie pipe is used. In this case concrete is carried through the water in water tight box by bottom dump bucket and reaching the final position there is a mechanism to open the bottom of the bucket and dispose the concrete. This will not give satisfactory result as some concrete get washed away.

Sometimes dry cement and dry coars aggregate and fine aggregate are mixed in a cement bag and disposed under water. This also do not give satisfactory result as cement bag make voids in concrete.

Among the two tremie pipe method is preferable.

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