Articles & Case Studies

Sika Keeps Lid on Hertford Water Tower

Posted: Wednesday 14th November 2007

Sika’s universally proven carbon fibre structural strengthening system was chosen as the ideal solution to re-establish an ailing roof slab on Bengeo Water Tower, which is owned by Three Valleys Water and is located on the outskirts of Hertford. The 30 metre high tower, which has a capacity of 900 cubic metres, dates back to the early 1930’s and was built with a 75mm thick reinforced concrete roof slab with minimum steel reinforcement.

Penetration of the concrete by the elements had lead to corrosion of the reinforcing steel, and consequently the slab had become structurally unsound. Because of the nature of the project, it was important that any repair materials used on this project met all criteria required for contact with potable water.

Consulting Engineers Bureau Veritas carried out a structural analysis of the structure, and decided upon a solution to reinstate and in fact improve upon the original strength of the slab by using the Sika® CarboDur® structural strengthening system.

After removing and reinstalling the failing concrete, specialist contractors Stonbury Limited bonded 500 metres of Sika® CarboDur® pultruded carbon fibre plates in a radial pattern to the underside of the roof slab using SikaDur® 30, a specially formulated, cold cure epoxy adhesive. This is a fast and efficient system, with a tried and tested track record, offering high performance with good technical support.

It was also decided to cut a new access hatch into the roof slab and this required two trimmer steel beams to be added to the underside of the slab for added strength locally. These were bonded in place using SikaDur® 31 Rapid, a solvent free, cold cure epoxy adhesive, which is suitable for bonding all types of construction materials.

Tel: 01707 394444

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