UFC 3-260-02
30 June 2001
FAIR Values, MN/m3 (lb/in.3)
Combined Base Thickness, mm (in.)
100 (4)
7.6 (28)
150 (6)
10.6 (40)
200 (8)
13.7 (51)
300 (12)
19.7 (74)
460 (18)
29.5 (108)
610 (24)
38.6 (142)
(c) Use the FAIR value with Figure 12-7 as though it were a k value and determine
the thickness of PCC pavement.
FAIR Value
Combined Base
Traffic Area PCC Thickness, mm (in.)
MN/m3
Thickness,
(lb/in.3)
mm (in.)
A
B
C
D
100 (4)
7.6 (28)
627 (24.7)
620 (24.4)
500 (19.7)
386 (15.2)
150 (6)
10.6 (40)
594 (23.4)
584 (23.0)
465 (18.3)
353 (13.9)
200 (8)
13.7 (51)
566 (22.3)
556 (21.9)
439 (17.3)
330 (13.0)
300 (12)
19.7 (74)
523 (20.6)
516 (20.3)
399 (15.7)
292 (11.5)
460 (18)
29.5 (108)
475 (18.7)
467 (18.4)
356 (14.0)
254 (10.0)
610 (24)
38.6 (142)
439 (17.3)
432 (17.0)
320 (12.6)
244 (9.6)
(d) Plot combined base versus PCC thickness for the different traffic areas as shown
in Figure 20-11. Locate equal or nearly equal thickness of PCC and base course as shown in the
figure. From Figure 20-11, the minimum thickness for the combined base course and PCC layer are
as follows:
Traffic Area
Combined Base Thickness, mm (in.)
PCC Pavement Thickness, mm (in.)
A
483 (19.0)
483 (19.0)
B
470 (18.5)
470 (18.5)
C
381 (15.0)
381 (15.0)
D
292 (11.5)
292 (11.5)
Shoulder1
152 (6.0)
152 (6.0)
1
The thickness of the shoulder was determined in a similar fashion as for the other traffic areas.
Use Figure 12-17 for determining pavement thickness.
20-18
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