30 June 2001
designs.). Figure 12-17 is a design curve for shoulders and is applicable to all airfields requiring
concrete shoulders. Figures 12-6 to 12-12 are design curves for the six Air Force standard airfield types,
and Figures 12-13 to 12-16 are individual design curves for various aircraft to be used in designing
pavements for conditions other than the basic airfield types. Thicknesses may also be determined using
the computer programs referenced in Chapter 1.
b. Plain Concrete Pavements on Nonstabilized or Modified Soil Foundations. For plain concrete
pavements that will be placed directly on nonstabilized or modified base courses or subgrade, the
thickness requirement will be determined from the appropriate design curve using the design parameters
of concrete flexural strength, R; modulus of soil reaction, k; gross weight of aircraft; aircraft pass level;
and pavement traffic area type (except for shoulder design). The design gross aircraft weight and pass
level may vary depending upon the type of traffic area or pavement facility. When using English units
and the thickness from the design curve indicates a fractional value, it will be rounded up to the nearest
full- or half-inch thickness. The minimum thickness of plain concrete pavement will be 150 millimeters
(6.0 inches). When it is necessary to change from one thickness to another within a pavement facility,
such as from one traffic area to another, the transition will be accomplished in one full paving lane width
or slab length. SI thickness values will be rounded up to the nearest 10 millimeters.
c. Plain Concrete Pavements on Stabilized Base and/or Subgrade. Stabilized base and/or
subgrade layers meeting the strength requirements of Chapter 9 and lean concrete base will be treated
as low-strength base pavements, and the plain concrete pavement will be considered an overlay with a
thickness determined using the following modified, partially bonded rigid overlay pavement design
ho = thickness of plain concrete overlay, millimeters (inches)
hd = design thickness of equivalent single slab placed directly on foundation, millimeters
Ec = modulus of elasticity of concrete, usually taken as 27,575 MPa (4 106 psi)
hb = thickness of stabilized layer or lean concrete base, millimeters (inches)
EXAMPLES OF PLAIN CONCRETE PAVEMENT DESIGN FOR ARMY AND AIR FORCE.
a. General. It is required that an airfield be designed as a medium-load pavement. Types A and B
traffic areas are designed for the F-15 at 36,740 kilograms (81,000 pounds), the C-17 at
263,100 kilograms (580,000 pounds), and the B-52 at 181,400 kilograms (400,000 pounds). Types C
and D traffic areas and overruns are designed for the F-15 at 27,555 kilograms (60,750 pounds), the
C-17 at 197,100 kilograms (435,000 pounds), and the B-52 at 136,080 kilograms (300,000 pounds).
Types A, B, and C traffic areas are designed for 100,000 passes of the F-15, 400,000 passes of the
C-17, and 400 passes of the B-52. Type D traffic areas and overruns are designed for 1,000 passes of