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Waterproofing, Sealants and Adhesives
News Release from: Sika | Subject: Carbon fibre structural strengthening system
Edited by the Buildingtalk Editorial
Team on 07 June 2007
Sika keeps lid on Hertford water tower
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.
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
This article was originally published on Buildingtalk on 8 Sep 2003 at 8.00am (UK)
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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.
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