IN AT THE DEEP END

Sika admixtures keep Leeds Swimming Pool and Diving Centre watertight In at the deep end and throughout the pool tank construction by Sir Robert McAlpine Ltd at Leeds City Council’s new swimming pool and diving centre on the South Leeds Stadium site, Sika admixtures are playing an important role in keeping the WSP designed competition facility watertight.

Meeting the required Grade 3 standard to BS8102, Sika’s BBA certificate-based watertight system comprising 3,500 litres of Sika 1 and 1750 litres of Sikament 10 admixtures in ready mix concrete supplied by Cemex UK, was used as an alternative to a tanking membrane for both the 50 metre long competition pool and the adjacent 5.5 metre deep diving pool. The powerful Sika admixtures were used to reduce water addition to the mix and block the remaining pores with a colloidal silicate blocker to decrease permeability.

Because of the facility’s competition status similar attention to fine detail was a feature of the entire contract. With a full range of diving platforms and spring boards to be installed, the diving pool has a floating floor that can be adjusted to change the use of the pool tank. Occupying the east third of the swimming pool a floating floor is also a key feature of the design with two submersible booms creating three separate areas. The pool tank had to be constructed to exacting tolerances to allow certification for competition use with the length of the pool having to measure -0 to +10mm of 50 metres at water level and 800mm below water level in the centre of each lane – the pool having 10 lanes.

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