Repair cracks in concrete floor.....

[edberg]

Hello!

I'm in the process of fixing my basement so we can furnish it, but I've run into some problems. The basement is from the 50s, and there are many surface cracks that I'm not worried about... I can seal them with suitable sealant. The big problem is the floor in the boiler room, which has now become the space for our geothermal heat pump, and later it's going to be a laundry room, has lots of cracks, especially in one half of the room where a huge oil tank used to be. The cracks are deep but not particularly wide... it's like there are different slabs of the floor, and when you walk from one to the other in a certain spot, you can feel them move. The floor is cast on sand and is very well-drained (we re-drained the house foundation last year). How do I fix this? The plan is to lay tiles in this room, so I will self-level, but I assume that's not going to be enough? How do I do it in the best way without having to tear up the entire floor?

Grateful for any advice.
/The DIY Enthusiast

 

[anaitis]

Lift up the loose "kakorna", dab in remaining parts, and cast new concrete in the holes.

 

[trojlee]

it will come off anyway... is the floor reinforced?... How big is the room? I would have broken out the floor and recast it with reinforcement if it is in as bad of a condition as you say... then it will be done properly and you won’t have to worry about the tiling turning out bad..
//
M