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I was just wondering I have poured a shed slab for someone…

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Hello I was just wondering...
Hello I was just wondering I have poured a shed slab for someone requiring 100 mm thick slab with 200 thick egde thickenings, which required 20 MPA concrete, my slab is 100 mm thick With edge thickenings at 160mm, i used 25 MPA concrete instead, would using the 25MPA concrete counteract for my thinner edge thickening???
Submitted: 8 months ago.Category: Structural Engineering
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Answered in 8 minutes by:
9/16/2017
Structural Engineer: StructuralEng, Consultant replied 8 months ago
StructuralEng
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Category: Structural Engineering
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Customer reply replied 8 months ago
Hello how did you go
Structural Engineer: StructuralEng, Consultant replied 8 months ago
Unfortunately, the higher compressive strength doesn't offset the thinner slab. Concrete doesn't take tension, the reinforcing steel does, so the depth is what matters. Increased compressive strength helps, but in a very minor way.
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Structural Engineer: StructuralEng, Consultant replied 8 months ago
Where the higher strength helps is a compression element, but this is not a compression element
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Customer reply replied 8 months ago
But having the higher mpa throughout wouldn't that strengthen it more, my slab is the right thickness just the edge been 40 mm thinner?
Structural Engineer: StructuralEng, Consultant replied 8 months ago
I can't speak to how it was designed, but what I can say is that the higher strength won't compensate for the reduced depth for bending forces.
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Customer reply replied 8 months ago
It also has SL 62 mesh, how would I be able to resurrect this it's a 8mx3.5m slab, if I put a pad footing under each corner and in the middle would this compensate?
Customer reply replied 8 months ago
Shed slab is for a bolt down kit shed
Structural Engineer: StructuralEng, Consultant replied 8 months ago
There isn't a serious strength concern, but you should make the aware of the increased potential for cracking.
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