| Project | Cleaning and Restoration of Cripps Building, St John’s College, by Gunite |
| Client | St Johns College |
| Architect | RH Partnerships |
| Value | £220,000 |
| Duration | 8 Months |
Gunite undertook cleaning and restoration trials of the Grade II* listed building during spring 2008.
Doff, a cleaning system using super-heated water under pressure, was identified as the most effective method for cleaning the concrete. Sample defects were broken out, and repaired using Remmers Betofix RM repair material to within 15mm of the surface of the concrete. The final layer of the repair was formed from a pre-matched mortar mixed with a carefully selected range of crushed aggregate in the correct ratio to replicate the texture and appearance of the surrounding concrete.
In December 2009, Gunite commenced the main contract works.
The requirement for en-suite bathrooms risked compromising the structural integrity. Carbon fibre plate bonding was proposed for strengthening around the new service holes. Gunite enlisted specialist Engineers, Jenkins and Potter, to design the scheme, then installed the carbon fibre plates using Sikadur 30 adhesive to bond them to the concrete.
The refurbishment programme has ensured that the
Scope of Works
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Heritage restoration
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Doff cleaning
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Survey
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Sympathetic concrete repairs
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Migratory corrosion inhibitor
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Protective coatings
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Carbon fibre plate bonding
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Mastic sealant
