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Situations will develop where special joints or variations of the more standard type joints will be needed to accommodate the movements that will occur and to provide a satisfactory operational surface. Some of these special joints or junctures are discussed below. (1) Slip-type joints. At the juncture of two pavement facilities, expansion and contraction of the concrete may result in movements that occur in different directions. Such movements may create detrimental stresses within the concrete unless provision is made to allow the movements to occur.

As such, the dowels affect a reduction in the critical edge stress directly proportional to the degree of load transfer achieved at the joint. A secondary function of dowels is to maintain the vertical alignment of adjacent slabs, thereby preventing faulting at the joints. Dowels are required at all contraction joints in slabs that are 8 inches or greater in thickness and for thinner slabs in concentrated traffic areas. (1) Dowel specifications. Dowel diameter, length, and spacing should be in accordance with the criteria presented in table 5-3.

It is decided that the 7-inch floor slab in Example 1 should be reduced to 6 inches by reinforcing the slab using 60,000-pounds per square inch yield strength steel reinforcement. The percent reinforcement required for the 6-inch slab should be determined. b. Solution. From figure 5-4, a straight line should be drawn between h = 7 inches and hr = 6 inches and extend line to S. 13 percent. C-4. Example 4: Concrete slab Thickness for tracked vehicle. a. Problem. The floor slab thickness h, should be determined for a tank repair shop.

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Concrete Floor Slabs on Grade Subj to Heavy Loads [US Army TM 5-809-12]


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