Common use of Tremie method Clause in Contracts

Tremie method. In addition to the normal precautions to be taken in the Tremie concreting the following requirements are particularly applicable in Tremie concreting. (a) The concrete should be coherent, which in cement (not less than 370kg/m3 and of sIump not, less than 150 mm (b) When concreting is carried out under water, a temporary casing $hall be installed to the full depth of the borehole or 2 meters into non-collapsible stratum, so that fragrant of ground cannot drop from the sides of the hole into the concrete as it is placed. The temporary casing may not be required except near the top when concreting is done under drilling mud.