Table 7. Effect of change in PCC modulus on base and subgrade modulus.
FWD
PCC
Base Subgrade
AA error PCC
Base Subgrade
AA error
Date
location
(MPa)
(MPa)
(MPa)
(%)
(MPa)
(MPa) (MPa)
(%)
20 Mar
9
27,580
4,965
825
13.3
34,475
3617
828
12.3
24 Mar
9
27,580
1,935
455
17.4
34,475
1045
463
12.8
27 Mar
9
27,580
1,373
162
20.6
34,475
529
165
17.7
4 Apr
9
27,580
643
139
14.5
34,475
81
155
10.3
7 Apr
9
27,580
526
62
14.4
34,475
16
81
11.5
10 Apr
9
27,580
1,050
107
16.9
34,475
255
110
14.3
14 Apr
9
27,580
1,495
111
9.5
34,475
537
113
8.9
17 Apr
9
27,580
1,200
81
13.8
34,475
387
82
11.7
21 Apr
9
27,580
1,547
116
16.9
34,475
685
118
15.1
24 Apr
9
27,580
1,612
99
18.3
34,475
749
100
16.2
18 Mar
17
27,580
5,956
425
31.6
34,475
4092
429
32.2
24 Mar
17
27,580
4,802
589
12.8
34,475
3038
595
9.7
27 Mar
17
27,580
2,071
157
11.6
34,475
--
--
--
4 Apr
17
27,580
2,821
131
5.9
34,475
1455
134
5.8
7 Apr
17
27,580
1,747
51
10.9
34,475
639
52
9.4
10 Apr
17
27,580
1,520
58
8.4
34,475
316
59
8.3
14 Apr
17
27,580
3,717
133
3.9
34,475
2282
135
4.2
17 Apr
17
27,580
2,416
57
8.7
34,475
--
--
--
21 Apr
17
27,580
3,560
50
8.9
34,475
2350
49
7.8
24 Apr
17
27,580
18,212
18
129.2
34,475
--
--
--
18 Mar
18
27,580
149
595
--
34,475
--
--
--
24 Mar
18
27,580
3,216
367
23.0
34,475
1750
373
19.4
27 Mar
18
27,580
3,645
32
10.8
34,475
2335
33
9.2
4 Apr
18
27,580
4,027
39
9.6
34,475
--
--
--
7 Apr
18
27,580
3,499
26
4.6
34,475
2241
26
3.5
10 Apr
18
27,580
4,713
29
9.1
34,475
2609
30
2.1
14 Apr
18
27,580
2,611
82
5.2
34,475
--
--
--
17 Apr
18
27,580
2,035
39
7.0
34,475
708
40
7.2
21 Apr
18
27,580
--
--
--
34,475
--
--
--
24 Apr
18
27,580
2,572
35
8.9
34,475
1473
36
9.7
18 Mar
19
27,580
5,648
272
11.4
34,475
3839
278
8.6
24 Mar
19
27,580
5,133
316
--
34,475
3195
319
11.5
27 Mar
19
27,580
--
--
--
34,475
--
--
--
4 Apr
19
27,580
--
--
--
34,475
--
--
--
7 Apr
19
27,580
2,163
29
8.2
34,475
830
30
8.0
10 Apr
19
27,580
1,852
32
7.0
34,475
551
33
7.4
14 Apr
19
27,580
--
--
--
34,475
--
--
--
17 Apr
19
27,580
1,482
29
9.3
34,475
444
30
8.2
21 Apr
19
27,580
--
--
--
34,475
--
--
--
24 Apr
19
27,580
1,891
30
8.8
34,475
591
31
8.3
800
Central Wisconsin Airport
27,580 MPa
34,475 MPa
600
400
200
0
19 Mar
24
29
3 Apr
8
13
18
23
28
Figure 18. Change in subgrade modulus during spring thaw (FWD loca-
tion 9, CWA).
18
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