Flaking concrete slab - Help

[jazzbhatia]

Hi All,

I recently had a single storey rear extension built. Outside the extension is a concrete slab.

Since it was laid last year it seems to be flaking alot of concrete in powder form, it seems like the mix did not have enough concrete. There is two and a half bricks between the slab and DPC, and I am considering the easiest way to stop this flaking.

How best can I achieve this, I really don’t want to take it up and re-lay it.

Please kindly share some ideas, someone did say to use garage paint but not sure this would stop the flaking.

Thanks in advance

 

[jazzbhatia]

Anyone out there?

 

[dann09]

1. If i understand you, you have built an extension off a concrete slab, and the slab extends beyond the exterior wall, like a patio base?

2. Now, the top of the slab is either delaminating or powdering? Inside the structure, or outside?

3. How thick is the concrete, and who supplied and laid the concrete?

 

[jazzbhatia]

The slab does extend from the outside wall and it seems like the mix was too weak.

The powering is outside on the patio slab. It was done by a contractor who was called in for that specific job

 

[dann09]

So, it's still a bit confused, the slab in question is independent of the extension slab?
Why dont you post a pic?
There are conc sealers (google them) that would inhibit powdering, if that is what it is?

 

[r896neo]

have you used a lot of de-icing salt in the area over winter?