CLOCK TOWER AND CHAPEL, GEELONG GRAMMAR SCHOOL, VIC
The project involved the repair of deteriorated reinforced concrete and render elements of several heritage buildings at
Geelong Grammar School in Corio, Geelong. The soffit of the reinforced concrete roof slab of the Clock Tower, the concrete
roof slabs of the two Chapel Bell Towers and several other concrete façade elements required repair, with many receiving an
impressed-current cathodic protection system to protect against further deterioration.
The Clock Tower reinforced concrete roof slab and perimeter edge beams have suffered from deterioration caused by carbonation. Areas of loose and delaminated concrete were removed using hand held jackhammers and reinstated using trowel-applied, low resistivity concrete repair mortar. Discrete anodes, spaced at 300mm centres, were used to protect the perimeter edge beams while a graphite based conductive coating system was used to protect the roof slab soffit. A 240 volt powered transformer rectifier supplies the impressed current to the different anode systems.
The Chapel Bell Tower roof slabs have also suffered from carbonation-induced deterioration. Ribbon mesh anodes spaced at 200mm centres were used to protect the roof slab soffits. Each roof slab anode system is powered by a transformer rectifier from a rooftop solar panel.
Several reinforced concrete window lintels were also repaired and each lintel was cathodically protected with a single ribbon mesh anode supplied from a transformer rectifier powered by a solar panel.
The cathodic protection work was completed in 2006.