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Technical Committee 202 /
Comité technique 202
existence or non-existence, and temperature of subgrade of No.
6 case went down below 0
℃
in non-existence of anti-frost layer.
(a) Existence of anti-frost layer
(b) Non-existence of anti-frost layer
Figure 6. Frost penetration depth of No.4 region
3.3 Analysis of frost penetration depth for the region with
freezing index 350~450
℃
·day
The temperatures at No.7, No.8 and No. 9 regions went down
below 0
℃
to subbase course and base course regardless of anti-
frost payer existence or non-existence.
(a) Existence of anti-frost layer
(b) Non-existence of anti-frost layer
Figure 7. Frost penetration depth of No.9 region
3.4 Analysis of frost penetration depth according to
regional
In this study, analysis of temperature distribution along the
paved road profile was carried out with the measured the lowest
daily temperature. Table 2 describes the frost penetration depth
of cutting section with anti-frost layer for three years.
Table 2. Estimation results of frost penetration depth for three years
Year
Region
2009~2010
(cm)
2010~2011
(cm)
2011~2012
(cm)
No. 1
110
More than 110
70
No. 2
120
More than 130
More than 130
No. 3
92
100
100
No. 4
80
80
50
No. 5
55
55
40
No. 6
103
More than 120
120
No. 7
28
50
22
No. 8
60
More than 60
45
No. 9
40
50
10
No. 10
70
50
50
No. 11
40
50
36
No. 12
17
17
17
No. 13
10
18
10
No. 14
18
37
29
No. 15
50
70
52
4 COMPARISON OF FROST PENETRATION DEPTH OF
FIELD RESULTS WITH EXISTING THEORY
The empirical equations developed by the Korea Institute of
Construction Technology (KICT) and Japan Road Association
(JRA) were used to determine the frost penetration depth. The
results of frost penetration depth measured in the field and
estimated by the empirical equations are tabulated in Table 3.
Generally the frost penetration depths determined by the
empirical equations are greater than those of field measurement
with the exception of No.1, No.2 and No.3 sites. In particular,
the results calculated by the Japan Road Association show no
significant differences among the regional category of frost
index.
