| | Slump of 4-6 inches (101.6 mm-152.4 mm) | | |
| Slab Thickness | Max. size aggregate Less than ¾ inches (19.05 mm) | Max. size aggregate larger than 3/4 inches | Slump less than 4 inches (101.6 mm) |
| 4" (101.6 mm) | 8' (2.4 m) | 10' (3.05 m) | 12' (3.66 m) |
| 5" (126.9 mm) | 10' (3.05m) | 13' (3.96 m) | 15' (4.57m) |
| 6" (152.4mm) | 12' (3.66 m) | 15' (4.57 m) | 18' (5.49 m) |
| 7" (177.8mm) | 14' (4.27 m) | 18' (5.49 m) | 21' (6.4 m) |
| 8" (203.1 mm) | 16' (4.88 m) | 20' (6.1 m) | 24' (7.32 m) |
| 9" (228.6 mm) | 18' (5.49 m) | 23' (7.01 m) | 27' (8.23 m) |
| 10" (253.9 mm) | 20' (6.1 mm) | 25' (7.62 m) | 30' (9.14m) |
The term control joint is often used as being synonymous with construction joint, however, there is a difference between the two. A control joint is created to provide for movement in the slab and induce cracking at that point, whereas a construction joint is a bulkhead that ends that day’s slab pour. When control joints are created by bulkheading off a slab pour, rather than saw-cutting after the slab has been poured, steel dowels are often inserted in the bulkhead to increase load transfer at this joint.
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