What Causes Concrete Cancer, and What to Look For in Melbourne

Concrete cancer begins when water finds its way through cracks or pores in the concrete to the steel reinforcing inside, and reacts with it to form rust. The University of New South Wales's own explanation is worth reading in full: the rust is a problem twice over, because the corrosion product is bigger than the metal from which it formed, and because the portion of the material that provides the strength is corroding.

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What concrete cancer signs and causes in Melbourne actually involves

Rust that forms inside the concrete forces open bigger cracks than were there before, degrading the concrete further by progressively letting more water in. It is a cycle that speeds up rather than staying still, which is why UNSW notes it is still a major concern in older buildings.

Who assesses it

A professional engineering service in structural engineering, assessing what is causing the damage and designing a repair, must be provided by a person registered as a practising professional engineer in that area, or under the direct supervision of one. The Act's own definition of the service reaches a construction, production, operation or maintenance activity relating to engineering, which covers an assessment of existing, corroding concrete, not only new construction.

A hairline crack running across a grey concrete surface with a rust-coloured stain bleeding out along it — concrete cancer signs and causes, Melbourne. Illustrative example.

What we do not answer

Whether resurfacing works for a given case is not something any government or university source read for this site addresses, so this page does not answer it either way: a structural engineer's assessment of the specific damage is what decides the right repair, not a general rule. The main page covers registration and permits.

Look for rust staining and cracking, and for concrete that has visibly broken away, and have it assessed rather than judged from a photo.

Rainwater lying in a network of cracks on a concrete balcony floor, with two rust-coloured stains beside the cracks — concrete cancer signs and causes, Melbourne. Illustrative example.

Concrete cancer repair costs and rules check