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Magnesite floors were common in the 1960s, mainly in Sydney and originally used as a floor covering across the board in most residential unit developments. Since its installation, it has become evident that after a period of 30 years or more, and due to long term exposure to household moisture and/or water through balcony doors or windows, the magnesite has been the source of chloride ingress into the concrete slab. This has led to the corrosion of the steel reinforcement in the concrete floor, resulting in cracking, spalling and ‘lumping’ of the concrete below the floor covering, with the condition commonly referred to as ‘concrete cancer’. 

What To Look For?

  • Cracks in floor tiles

  • Pothole-like corrosion in concrete slabs

  • Corrosion build up

  • Lumps under Carpet

How Can We Help?

  • Removal of magnesite topping and all chloride contaminated concrete and replacing with fresh concrete.

  • Eliminate the magnesite topping and all spalled and delaminated concrete, carry out cathodic protection repair and install an impressed current cathodic protection system to the floor slab.

  • Removal of magnesite topping and all spalled and delaminated concrete, carry out conventional repair work (breakout behind reinforcement)

  • Apply a rust inhibitor primer to clean steel ensuring future protection from the elements


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