warehouse concrete slab on grade contract joint
warehouse concrete slab on grade contract joint
(OP)
For a warehouse slab foundation (200'x 90'), the columns are on the perimeter. The foundation will be 6" slab with 24"x36" perimeter beam.
The slab will be reinforced with #6 @ 12" oc both way with no contact joint. Is this a good option? or it would be better to design contact joint with less reinforcement?
The slab will be reinforced with #6 @ 12" oc both way with no contact joint. Is this a good option? or it would be better to design contact joint with less reinforcement?






RE: warehouse concrete slab on grade contract joint
RE: warehouse concrete slab on grade contract joint
If there are no storage racks, and assuming proper sub-base prepartation, #6@12" o.c.e.w., properly chaired to approximately 2" below the finish floor elevations, should ensure that any cracks (and there will be some) will remain 'tight'.
As a general rule, we find that if we keep As to at least 0.5% of the area of concrete, concrete joints will stay tight.
If you have a contractor on board, you may want to discuss if he is comfortable with pouring this size of floor without joints. This is a decent size area, and it will take coordination to get the concrete trucks to coordinate their arrivals properly. Not impossible, larger pours are done all the time, but still needs to be thought out before hand.
RE: warehouse concrete slab on grade contract joint
If desired, do a volume change calculation on your slab. For 200' you will probably have around 2" of crack widths from one end to the other.
RE: warehouse concrete slab on grade contract joint
Just a thought!
RE: warehouse concrete slab on grade contract joint
The owner asked me not to worry about the storage stack force or forklift. He want to save the cost of construction. That's the reason I try to eliminate the joint. I understand without the contract joints, even with continuous reinforcement, the minor random cracks will still develop.
There are interior columns, but are located inside the mezzanine area. For this area, I use 4" slab with thicken slab for the load bearing from columns. Is a construction joint need for the connection between 4" and 6" concrete slab?
RE: warehouse concrete slab on grade contract joint
RE: warehouse concrete slab on grade contract joint
RE: warehouse concrete slab on grade contract joint
RE: warehouse concrete slab on grade contract joint
If its light duty, save your money on reinforcing, add control(crack) joints, and be done. We have done many a slab on grade with no reinforing, and not had problems. We did 6" all the time. Im sure that 18,000 sq. ft. of buying and placing rebar is far more expensive than a finisher with a saw.
Also, without the rebar, you can get a laser screed in the building, and not have to leave strips out for it, giving you a superior finish.
RE: warehouse concrete slab on grade contract joint
RE: warehouse concrete slab on grade contract joint
What is the purpose of the perimeter 24"x36" beam? Why not a frost wall and footing?
BTW, the correct term for the joints would be control joints or construction joints.
RE: warehouse concrete slab on grade contract joint
RE: warehouse concrete slab on grade contract joint