UFC 3-260-02
30 June 2001
Traffic Area
Combined Base Thickness, mm (in.)
PCC Pavement Thickness, mm (in.)
A
579 (22.8)
579 (22.8)
B
577 (22.7)
577 (22.7)
C
483 (19.0)
483 (19.0)
D
386 (15.2)
386 (15.2)
Shoulder1
152 (6)
152 (6)
1
The thickness of the shoulder was determined in a similar fashion as for the other traffic areas.
Use Figure 12-16 to determine minimum pavement thickness.
(e) Compare these reduced subgrade strength pavement thicknesses with those
required for the limited subgrade frost penetration design.
(2) Limited subgrade frost penetration design.
(a) From Figure 20-7, the minimum PCC thickness for nonfrost conditions is as
follows:
Traffic Area
PCC Thickness, mm (in.)
A
599 (23.6)
B
597 (23.5)
C
490 (19.3)
D
384 (15.1)
For pavement thicknesses greater than 305 millimeters (12 inches), deduct 133-degree Celsius
hours (10-degree Fahrenheit days) from the design freezing index for each 25 millimeters (1 inch) in
excess of 508 millimeters (12 inches).
(b) Assuming the average moisture content and density of the combined base course
is 7 percent and 2,403 kg/m3 (150 lb/ft3), respectively, the maximum frost penetration a is
obtained from Figure 20-5 or from Equation 20-10.
PCC Thickness
Design Freezing Index
Frost Penetration
Traffic Area
mm (in.)
EC hr (EF-days)
mm (in.)
A
592 (23.6)
25,114 (1,884)
2,235 (88)
B
597 (23.5)
25,127 (1,885)
2,235 (88)
C
490 (19.3)
25,687 (1,927)
2,286 (90)
D
384 (15.1)
26,246 (1,969)
2,311 (91)
20-23
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