UFC 3-260-02
30 June 2001
Table 11-10
Data File for Computing Asphalt Damage
List ADATA1
100
Taxiway Design; A5. Thickness = 4 inches
110
4 100000
120
.25 .16667 .25 .33333
130
1390000. 960000. 490000. 210000.
140
.000217 .000228 .000247 .000219
150
Taxiway Design; A5. Thickness = 5 inches
160
4 100000
170
.25 .16667 .25 .33333
180
1390000. 960000. 490000. 210000.
190
.000218 .000234 .000267 .000263
200
Taxiway Design; A5. Thickness = 6 inches
210
4 100000
220
.25 .166667 .25 .3333
230
1390000. 960000. 490000. 210000.
240
.000200 .000227 .000270 .000295
250
End of data
260
0 0
developed. From Figure 11-19, the taxiway thickness for a damage factor of 1.0 is determined to be
430 millimeters (16.9 inches). The fatigue damage factor based on the asphalt criteria is then computed
for a pavement thickness of 430 millimeters (16.9 inches). Also, from Figure 11-19 the runway thickness
for a damage factor of 1.0 is determined to be 345 millimeters (13.6 inches).
b. The plot of asphalt strain versus asphalt modulus is shown in Figure 11-20. The asphalt strain
for each time period is given in Table 11-14. Using the computer program ASPHALT, the fatigue
damage factor is computed to be 0.15, which is considerably less than 1.0. Thus, a pavement thickness
of 430 millimeters (16.9 inches) meets both the subgrade criteria and the asphalt fatigue criteria.
c. The runway design is accomplished in the same manner as the taxiway design. The
conventional runway section of 102 millimeters (4 inches) of asphaltic concrete and 635 millimeters
(25 inches) of granular base and subbase converted to a 840-millimeter (33-inch) effective thickness.
An ABC pavement of 370 millimeters (14.5 inches) would be required to give the same effective
thickness. Based on the estimated thickness, the subgrade damage factor was computed for pavement
thicknesses of 330, 355, and 405 millimeters (13, 14, and 16 inches). The aircraft wheel load and the
number of load repetitions for the computations were the same as used in the design for the
conventional section. The subgrade strains and the asphalt strains as a function of pavement thickness
are given in Figures 11-21 and 11-22, respectively. The data for computing the damage factors are
11-20
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