PCA Method for designing industrial concrete slabs on grade
PCA Method for designing industrial concrete slabs on grade
(OP)
I'm designing a concrete slab that going to see an axle load of around 137 kips. My concern is with the contraction joints. PCA method mentions every 18', I doubt that the cost estimate for the foundation accounted for all the dowels/support baskets that would be necessary to follow these guide lines. Any suggestions? Slab is 72 m x 36 m, 18" thick (T and B layer of temp and shrinkage steel) w/ thickened edges. Thanks






RE: PCA Method for designing industrial concrete slabs on grade
The joints are necessary as well. For that thickness of slab, you can stretch your joints out a bit more than 18 feet, but 20 feet is fairly common for airfield slabs, which often have similar thickness.
In your case a 6m joint spacing,each direction, would work well. Require that the joints be cut to a depth of at least 100mm within 8 hours of placement.
RE: PCA Method for designing industrial concrete slabs on grade
RE: PCA Method for designing industrial concrete slabs on grade
The dowels are usually placed at about 12 to 18 inch centers, placed at mid-depth and are continuous for the length of the joint in the transverse direction. Tie bars are used along the outside joints to keep the slabs from drifting outward. Longitudinal dowels may be required if your traffic pattern is non-uniform and crosses other joints equally. In that case, be sure to leave the dowels out near the joint intersections.
RE: PCA Method for designing industrial concrete slabs on grade
What about grease on the end of the dowel, is that also recommended/required? for temperature and shrinkage allowance.
Regards,
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RE: PCA Method for designing industrial concrete slabs on grade
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RE: PCA Method for designing industrial concrete slabs on grade