UFC 3-260-02
30 June 2001
c. Assume that a 152-millimeter (6-inch) lean concrete base course will be used. The compressive
strength of the lean concrete is 20.6 MPa (3,000 psi), and the flexural modulus of elasticity is
13,788 MPa (2 106 psi). As with the previous example, the required thicknesses of plain concrete
pavement on both the nonstabilized and on the lean concrete base are determined and are shown in
columns 2 and 3 of Table 13-2. A value may then be selected for the required thickness of reinforced
concrete or the percentage of reinforcing steel and determine the other using Figure 13-1. If a percent
steel value of 0.20 is selected, the values of reinforced concrete from Figure 13-1 would be shown in
column 4 of Table 13-2. These values rounded for construction are listed in column 5. Then, reenter
Figure 13-1 with the rounded values of reinforced concrete to obtain the required percent steel shown in
column 6. The allowable slab lengths are determined from Equation 13-1 or Figure 13-1 using a
reinforcing steel with a yield strength of 413 MPa (60,000 psi) (column 7). If a reinforced concrete
thickness of 380 millimeters (15 inches) is selected for the type A, B, and C traffic areas and a thickness
of 255 millimeters (10 inches) is selected for the type D traffic area, then the required percent steel
determined from Figure 13-1 would be as shown in column 8. Column 9 presents the allowable lengths
or widths of slab for the reinforced concrete pavement.
13-7
Previous Page
