Primary Roads and Interstates
Secondary Roads
in.
mm
0
0
76 mm (3 in.) Asphalt Concrete
152 mm ( 6 in.) Asphalt Concrete
100
5
203 mm (8 in.) Crushed Gravel
200
10
300
305 mm (12 in.) Crushed Gravel
15
203 mm (8 in.) Gravel
400
500
20
203 mm (8 in.) Sand
600
305 mm (12 in.) Gravel
25
700
30
800
35
900
305 mm (12 in.) Sand
1,000
40
1,100
45
Subgrade Material
Subgrade Material
1,200
50
1,300
Figure 10. Typical pavement cross sections used by NHDOT.
C
F
40
100
30
80
20
60
10
40
0
20
10
Air Temperature
Lebanon
0
20
Concord
20
30
22
11
30
19
8
27
17
6
26
14
Jun
Aug
Sep
Nov
Jan
Feb
Apr
Jun
Jul
Sep
Figure 11. Design air temperatures used for estimating subgrade temperatures.
17
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