Slab on Grade Bottom Bar Location
Slab on Grade Bottom Bar Location
(OP)
How much concrete cover is generally used for bottom slab bars in slab on grade?
ACI generally requires 3" for concrete cast against soil, but how about in the case when the slab is cast on a significant vapor barrier?
ACI generally requires 3" for concrete cast against soil, but how about in the case when the slab is cast on a significant vapor barrier?






RE: Slab on Grade Bottom Bar Location
Usually we use 50mm cover but with a high strength concrete.
RE: Slab on Grade Bottom Bar Location
RE: Slab on Grade Bottom Bar Location
If the steel is for temperature, not bending, put it in the middle of the slab.
RE: Slab on Grade Bottom Bar Location
Dik
RE: Slab on Grade Bottom Bar Location
The detail appeared odd with the bottom bars up 3".
The CRSI manual was showing 2" cover top and bottom, but that generated the question on the ACI requirement.
RE: Slab on Grade Bottom Bar Location
RE: Slab on Grade Bottom Bar Location
h
RE: Slab on Grade Bottom Bar Location
I tend to place the reinforcing nearest the top as noted. Visible cracks form on the top surface and become less noticeable with the rebar closest to the visible surface.
Dik