UFC 3-260-02
30 June 2001
d. Example Design, Slab on Stabilized Base. Assume that a cement-stabilized base course will be
used. Laboratory tests on base-course material have shown that a cement content of 7 percent by
weight will yield a 7-day compressive strength of 6.89 MPa (1,000 psi) and a flexural modulus of
AFJMAN 32-1019, the compressive strength of 6.89 MPa (1,000 psi) qualifies as a stabilized layer (that
is, permits a thickness reduction), and the design is made using Equation 12-1. The single slab
thickness hd of plain concrete is determined from Figure 12-7 using R = 4.8 MPa (700 psi) and k =
54 kPa/mm (200 pci) for the design load and pass level for each type traffic area. The thicknesses of
plain concrete overlay determined with Equation 12-1 for several thicknesses of stabilized layer are
shown in the following tabulation:
Overlay Thickness ho,
Thickness of Stabilized
Thickness of Slab on
mm (in.)
Type Traffic Area
Layer hb, mm (in.)
Grade hd, mm (in.)
A
150 (6)
406 (16.0)
380 (15.0)
300 (12)
406 (16.0)
330 (13.0)
450 (18)
406 (16.0)
267 (10.5)
B
150 (6)
406 (16.0)
370 (14.5)
300 (12)
406 (16.0)
330 (13.0)
450 (18)
406 (16.0)
254 (10.0)
C
150 (6)
300 (12.0)
280 (11.0)
300 (12)
300 (12.0)
215 (8.5)
450 (18)
300 (12.0)
150 (6.0)
D & Overrun
150 (6)
229 (9.0)
200 (8.0)
150 (6.0)1
300(12)
229 (9.0)
150 (6.0)1
450 (18)
229 (9.0)
Note: Final design overlay thicknesses should be rounded in accordance with paragraph 4b.
1
Minimum thickness of plain concrete pavement.
The final selection of plain concrete pavement and stabilized base thicknesses will be based upon the
economics involved.
e. Design Example for Mixed Traffic.
(1) General. The design of rigid airfield pavements has been based on a standard definition of
aircraft mixture, load, and pass levels. However, pavements may be designed for a mixture of aircraft
type, loadings, and repetitions other than the standard. This design example presents a procedure for
the design of pavements which will be subjected to a mixture of traffic types and loadings based upon
equivalent aircraft loadings.
(2) Procedure. The design of a concrete pavement to accommodate a mixture of aircraft traffic
is accomplished using the following steps:
12-4
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