huangyhg

slab on grade fire station
we are designing a fire station. is an 8" (4,000 psi) slab on grade enough for the bay area? what about reinforcement? i will appreciate answers asap.
thanks
that is what i used in the past with two layers of bars! place joints in thoughtful manner. 4000 psi concrete is the minimum i use for slabs subjected to heavy traffic.
good luck
regards,
lutfi
of course it all depends on your soil conditions. i usually rely on the subgrade modulus to determine thickness. also soil preparation under the slab is critical. sorry that i left that out.
regards,
regards,
lutfi
is #3 rebar at 24" oc with 6x6x1.4wx1.4w enoguh? the slab will be on 4" crushed stone.
thanks
i would use #4 bars. you need to run the calculations to arrive at the required steel area.
regards,
lutfi
the thickness of a slab on grade is controlled by the wheel loading of the vehicles and the spacing of the vehicle wheels. you might want to check out "concrete floors on ground" by portland cement association. also, aci 360r has a summary table of other methods of designing slabs on grade. it lists the methods by portland cement association, wire reinforcing institute and the corp. of engineers. each of these groups has their own method of designing slabs. keep in mind that the steel in the concrete in the floor is only used for temperature and shinkage and not for flexure.
there is a terrific australian publication, industrial floors and pavements (

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