Damp on concrete floor

[Gava]

I have a down stairs bathroom which is an extension fitted on a concrete slab.

I have moved a radiator in the last few weeks and because there was no drain fitted had alot of free water on the concrete floor, which i did wipe up but happened a few times. Also i fitted a new bath, where the waste goes directly through the wall to the drains. When i replaced the waste pipe outside i didnt realise for a couple of weeks that the joint was leaking and the joint was about 2-3mm inside the wall, so everytime i drained the bath (daily) some water leaked into the brickwork (above the dpc) . Another thing is the water supply pipes run under the concrete floor, i dont believe i was man handling the pipes when working with them but not sure if i might have disturbed them????!!!!

I have two isolated damp spots about 2m away from the outside wall, ive been using a heated fan to dry these spots (2 days), which has had some result but the damp is still there.

If i have over saturated the floor how long will it take roughly for the water to be drawn out of the concrete?

If i have disturbed the water pipes would there be any way of conducting a pressure test overnight on the pipes?? (or through the combi boiler???)

 

[PrenticeBoyofDerry]

It could take sometime for the slab to dry out, do you know the thickness of the slab?
Can you replace the waste pipe within the wall then install a slightly longer straight, so the joint is not within the wall?
Not sure about the pressure test, not my thing! Could be worth putting it to the plumbers on the heating/plumbing forum.

 

[Gava]

The slab is around 6-7 inchs thick, ive been drying it and there has been some result, going to carry on for a couple more days and see what happens!!

i have re-set the waste pipe and am hoping to see some result from that.