Hi All
Thought I would post some pics showing what concrete cancer can look like and also the sort of work that's involved in rectifying it.
Here you are seeing some mild spalling of concrete from the ends of the reo rods. The concrete cancer is caused by the rusting of reo rods that happens when the reo rods have insufficient concrete cover. The concrete actually protects the reo rods from the air and sets up an alkaline environment which also deters the rusting. With insufficient cover the water leached away the alkaline environment and allows the reo rods to start rusting. Rust takes up way more space than the original steel rod and as a result expands the concrete and cracks it. This in turn allows more water and air to enter and cause further damage.
If you see cracks in concrete which is generally dry and this crack has any rusty colour about it then there is likely to be a rusting reo rod within.
If you look closely at the left corner of the balcony you see a small crack. This is the corner that in the next set of pictures is completely opened up.
To be continued........
Thought I would post some pics showing what concrete cancer can look like and also the sort of work that's involved in rectifying it.
Here you are seeing some mild spalling of concrete from the ends of the reo rods. The concrete cancer is caused by the rusting of reo rods that happens when the reo rods have insufficient concrete cover. The concrete actually protects the reo rods from the air and sets up an alkaline environment which also deters the rusting. With insufficient cover the water leached away the alkaline environment and allows the reo rods to start rusting. Rust takes up way more space than the original steel rod and as a result expands the concrete and cracks it. This in turn allows more water and air to enter and cause further damage.
If you see cracks in concrete which is generally dry and this crack has any rusty colour about it then there is likely to be a rusting reo rod within.
If you look closely at the left corner of the balcony you see a small crack. This is the corner that in the next set of pictures is completely opened up.
To be continued........