Water resistant concrete at sewage station

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Work at the pumping station included casting a base, 1400mm deep, underwater at the bottom of a 10m deep tank with a diameter of 7.5m approx. The concrete needed to resist washout during underwater placement as the water from tank was to be discharged, through a filtration system, into a watercourse.

Why was Toproc Underwater applications proposed?

Toproc UW is a proprietary microsilica concrete a thixotropic, very cohesive concrete, that is resistant to  washout and has low permeability. Typical 24-hour strength is 20-30N/mm2 with a target workability 180mm slump. The water level within the chamber was stabilised to prevent incoming water disrupting the newly placed concrete and placement of Toproc UW via tremie/pump to ensure that the concrete is continually placed within the mass of concrete already discharged.

 

For details see the full case study: Chew Magna Sewage Pumping Station (pdf, 248kb)
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