I have a prefab concrete staircase about 40 years old that cracked this winter. It feels like I will have to replace the entire staircase with something else because it probably can never be repaired?
It looks like the stair nose is about to break off due to reinforcement corrosion. It could be repaired by removing the bad concrete and recasting/repairing, but it would probably be difficult to make it look good. The stones on the surface also make it tricky to form without the concrete running away.
The staircase will probably continue to crack in more places in the next few years.
It is old enough that carbonation and possible thaw salts accelerate the degradation.
The best option is probably to replace it completely within a few years.
It looks like the stair nose is about to split off due to reinforcement corrosion. It could be repaired by removing bad concrete and recasting/patching, but it's probably difficult to make it look nice. The stones on the surface also make it tricky to form without the concrete running away. The stairs will likely continue to crack in more places in the coming years. It's old enough that carbonation and possibly thawing salt are accelerating the deterioration. The best option is probably to replace it completely within a few years.
Thank you for the response. It was good to know the reason, and as you wrote, it's just a matter of replacing it. Best regards, Bengt
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