Slab on grade reinforcing
Slab on grade reinforcing
(OP)
What is the minimum reinforcing required in a slab on grade or ground for shrinkage/temperature cracking?
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Slab on grade reinforcing
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RE: Slab on grade reinforcing
Assuming regular slab-on-grade, no prestressing etc.
As = (F*L*w)/(2*fs)
As = Area of reinforcement (sq. in.) per foot width of slab
F = Friction Factor (dependent on base and subbase - "typical" is 1.5)
L = Distance between joints (ft)
w = Dead weight of slab (psf)
fs = Allowable stress in the rebar (psi)
Might want to consider factors such as loads, application etc. to tweak this as necessary.
RE: Slab on grade reinforcing
Un-reinforced slabs are very common for residential and office type applications. Wouldn't recommend it for industrial or warehouse
RE: Slab on grade reinforcing
Mike McCann
MMC Engineering
RE: Slab on grade reinforcing
RE: Slab on grade reinforcing
RE: Slab on grade reinforcing
I should have taken typing in high school! My mind is way faster than my two fingers!
RE: Slab on grade reinforcing
Any idea why they removed it?
RE: Slab on grade reinforcing
RE: Slab on grade reinforcing
ACI states you need to use .5% reinforcement if there are no joints - for the example slab that would be 15 cm^2 of reinforcement (sum of top and bottom?) which quite a lot. Most of the designs don't have such an amount of reinforcement.
In my area contractors deal with crack control by dividing slab with more pours, using special concrete mixes, even pouring slab in two layers and adding micro reinforcement.
I would love to read about your experience.
Kind regards
Structural timber engineering