repair damage in concrete ceiling

[Rickie]

Hello!

I'm planning to paint a concrete ceiling soon. However, there's a small section, about 15 cm, where I could chip away loose concrete because the rebar had rusted a bit. This part that I need to repair/paint is outdoors.

Is it okay to apply some rust remover and then paint the visible part of the rebar with something like hammerite? And then repair it with new concrete?

Regards, Rickard

 

[Liteavvarje]

Where does the moisture come from, do you know that? Brush with a wire brush so that the loose parts are removed, new concrete doesn't bond really well to old without priming, splash primer up with a brush several times, no point in giving the iron a beating, and a little fine concrete, apply in layers otherwise it will fall down.

 

[Rickie]

Where does the moisture come from, do you know? Brush with a wire brush so the loose stuff comes off, new concrete doesn't adhere very well to old without primer, dab primer on with a brush several times, no point in going all out on the iron, and a little fine concrete, apply in layers otherwise it will fall off

Hello!

This is the floor of what was once an open terrace, the house is from the 60s. So it has been exposed to the weather until about 20 years ago when the terrace was enclosed. I think it might come from around that time. It actually held together quite well, but I wanted to remove as much as possible before the repair. So, you don't think it's worth going at the iron with some paint?

Best regards, Rickard

 

[Liteavvarje]

No, not like that, of course it has come through to that specific spot, but it probably won't help to iron it, to make it good you might need sealing of the deck with tar paper or metal sheeting, then it will be sealed and dry underneath.

 

[Rickie]

No, not like that, of course, it has come through to that exact spot, but just ironing it likely won't help. For it to be good, sealing the deck with tar paper or metal is probably needed, then it will be tight and dry underneath

Hello!
At present, the deck floor is already weather-protected, so I don't need to do much there. I think it's an old "damage" caused by being unprotected against weather and wind.

I'm repairing it with concrete, and a little rust stop so it should hold for another 60 years