epsilonGreedy Posted September 29, 2018 Share Posted September 29, 2018 I am considering pouring my ground-bearing garage floor slab before the inner block wall rises above dpc, the motivation for this build order is to create a solid standing area as winter conditions turn 50% of my site into soft mud. Is there a risk that the weight of the concrete during the pour will push up against the boundary blocks and dislodge them? I will give the blockwork mortar a week to reach maximum strength. The technical details of the floor slab are not yet determined but a little reading around the subject leads me to think 150mm thick plus some rebar is in order. Link to comment Share on other sites More sharing options...
Triassic Posted September 29, 2018 Share Posted September 29, 2018 (edited) Is it a block on edge or onthe flat? My initial reaction would be to pour, as the pressure at the edges isn’t that great. If if you were concerned, You could prop the blocks temporarily, either by backfilling against them with site won material, or by using timber. Edited September 29, 2018 by Triassic Link to comment Share on other sites More sharing options...
epsilonGreedy Posted September 29, 2018 Author Share Posted September 29, 2018 7 minutes ago, Triassic said: Is it a block on edge or onthe flat? On edge. The inner wall make up will be a 300mm wide trenchblock then two dense concrete blocks laid conventionally on edge. At present I do not know where the cavity fill will stop. Link to comment Share on other sites More sharing options...
Triassic Posted September 29, 2018 Share Posted September 29, 2018 Are you partially infilling both blocks and pouring concrete above that. I’d take care wackering the infill down. Maybe a photo would help! Link to comment Share on other sites More sharing options...
Jeremy Harris Posted September 29, 2018 Share Posted September 29, 2018 Wacking the sub-base in 50mm layers will almost certainly place more side load on the blocks around the edge than pouring, vibrating, levelling and floating the concrete I reckon. I was surprised how much side load there was when just wacking two layers of MOT 1 for a path; I'd driven in stakes and fitted boards to contain the sub-base, but found they tended to push outwards a bit. 1 Link to comment Share on other sites More sharing options...
PeterW Posted September 29, 2018 Share Posted September 29, 2018 You could infill with 100mm EPS and insulate below slab and it will also make the whole structure a bit more rigid for you. Also may help with your cavity sizing if you are DIY on the brick and block. Slope the top of it or just use 600mm DPC to make a step cavity tray as belt and braces. EPS doesn’t absorb water and is cheap too Link to comment Share on other sites More sharing options...
Oz07 Posted September 30, 2018 Share Posted September 30, 2018 I've worried about this before with the self compacting Conc being bit more fluid. Never been a prob. As has been said side pressure isn't great Link to comment Share on other sites More sharing options...
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