Table 8.6 Summary of Pavement Stress Analysis at Low Temperatures
Test
Road
Temp.
(F)
NDT
Device
Maximum
Deflection
(mils)
Subgrade
Compression
(%)
Subgrade
Strain*
(0.0001 in./in.)
AC
Stress**
(psi)
Percent of
AC Failure
Stress++
QD 9£R
O9
Dynaflect
13.0
83.0
1.66
89.0
22.3
OK OD
Co
FWD
11.1
80.4
1.51
90.7
22.7
SR 24
Dynaflect
8.1
44.9
0.88
182.0
45.5
FWD
11.7
35.5
1.05
278.0
69.5
IIS 441
Dynaflect
10.0
58.2
1.55
208.0
52.0
 O
FWD
12.4
51.8
1.76
267.0
66.8
SR 15C
41
Dynaflect
15.9
82.4
1.61
54.4
13.6
FWD
14.3
71.3
1.73
88.5
22.1
SR-80-1
41
Dynaflect
32.0
43.4
1.91
207.0
51.8
SR-80-2
41
Dynaflect
38.5
24.7
2.06
344.0
86.0
SR 80+
41
Dynaflect+
26.3
50.6
1.75
74.4
18.6
* Vertical compressive strain on top of subgrade layer
** Tensile stress at bottom of AC layer
+ Base course modulus increased to 85.0 ksi
++ Failure tensile stress of 400 psi