UFC 3-260-02

30 June 2001

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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