Passive slab concrete
Has anyone had any issues when pump pouring a passive slab?? The reason I ask is because I have, and it was a major pain in the arse.
Two weeks ago we had a very short spell of warmer weather and so I booked in my slab pour with my chosen contractor.
To cut a long story short it all went tits up. They pumped in a self compacting concrete, which they thought would be ok, and all it did was float the top layers of insulation along with the steel on top.
Luckily we managed to salvage
I also had problems with my passive slab, details in my blog, although not the same as yours. The slab is 200mm thick all over and the second attempt, which I had pumped with C35, was fine. On ours the DPM was on top of the polystyrene and held down by the steel and the concrete was pokered. When I had mine done self compacting/levelling wasn't really an option but I would have used it had it been available.