Concreting the siphons of the Dnepr-Donbass canal

Conclusions

• 1. Experience gained with the use of a travelling form for the concreting of monolithic siphons along the Dnepr-Donbass canal showed a savings as compared with the use of sectional panel forms. In this case, labor outlays are reduced almost by a factor of 2.5.

• 2. In selecting mix designs for water-impermeable concrete, it is necessary to consider the presence of particles smaller than 0.14 mm in the fine aggregate; a content of 10–20% of these particles increases markedly the water impermeability of the concretes, and reduces the cement factor.

• 3. When concreting thin-wall hydraulic river structures, one should take the time to determine the grade of concrete as regard the 180-day water impermeability, since it is impossible to create moist curing conditions for the concrete over such a prolonged period.