1353
Influence of Anti-freezing layer on the Frost Penetration Depth for Paved Road
Design
Influence d’une couche anti-gel sur la profondeur de pénétration du gel dans la conception des
chaussées
Shin E.C.
Dept. of Civil & Environ. Engrg, University of Incheon, Republic of Korea
Cho G.T., Lee J.S.
Research Ins. For Engrg. & Tech., University of Incheon, Republic of Korea
ABSTRACT : Design of pavement in seasonal freezing areas should consider the environmental conditions in case of design and
construction for pavement thickness. There are a lot of conditions of climate, soil, and material among the environmental conditions.
One of that is caused from effect of these conditions is frost heaving. The frost penetration depth of paved road in Korea is usually
estimated from the freezing index that made temperature data analysis of 30 years period and decided the thickness of anti-frost layer.
It may be caused of over-design for pavement design with using the current estimation method of the frost penetration depth.
Therefore, this study analyzed the depth of frost penetration for pavement design and the depth of frost penetration of paved road
using field monitoring data. This paper presents the field monitoring results of frost penetration depth with anti-freezing layer and
without anti-freezing layer. The analysis on the influence of anti-freezing layer to the pavement road was presented for the region of
South Korea.
RÉSUMÉ : La conception des chaussées dans les régions connaissant des périodes de gel doit tenir compte des conditions
environnementales. Parmi les conditions environnementales, nombreuses sont celles relatives au climat, au sol et aux matériaux. Mais
l’une d’entre elles est causée par l’impact de toutes ces conditions, c’est le déchaussement. En Corée du Sud, la profondeur de
pénétration du gel d’une route goudronnée est généralement évaluée à partir de son indice de gel. Celui-ci repose sur une analyse de
données de température sur une période de 30 ans, et sa valeur détermine l’épaisseur de la couche anti-gel. La méthode de calcul
actuelle de la profondeur de pénétration du gel peut néanmoins provoquer une exagération de la profondeur des chaussées. Cette étude
analyse le phénomène à l’aide de données de surveillance obtenues sur le terrain. L’article présente également les résultats de la
surveillance sur terrain de la profondeur de pénétration du gel sur des routes ayant une couche d’anti-gel et sur des routes n’en ayant
pas. Les résultats de l’analyse de l’action de la couche d’anti-gel sur une route correspondent au cas de la Corée du Sud.
KEYWORDS : Field Frost Penetration Depth, Frost Index, Frost Penetration Map, Pavement, Air Temperature
1 INTRODUCTION
Desing of pavement in seasonal freezing areas should consider
the environmental conditions including climate, soil, and
moisture content of soil. One of that is caused from effect of
these conditions is frost heaving. Jiang and Tayabji(1999)
studied on the influence of in-situ moisture content on the
seasonal monitoring site. Tomasz(2009), Wu, Zang and
Liu(2010) evaluated the factors influenced on the freezing point
in the soil water system and long-term thermal effect of the
asphalt pavement.
The frost penetration depth of paved road in Korea is usually
estimated from the freezing index that made temperature data
analysis of 30 years period and decided the thickness of anti-
frost layer. It may be caused of over-design for pavement design
with using the current estimation method of the frost penetration
depth. Therefore, this study analyzed the depth of frost
penetration for pavement design and the depth of frost
penetration of paved road using field monitoring data.
2 FIELD MONITORING SYSTEM
2.1 Measuring instruments and their position
Field monitoring system is a system that measures field
environmental parameters such as moisture and temperature.
Purpose of field monitoring system is to measure the moisture
content and temperature of the pavement automatically,
continuously and objectively. Sensors of field monitoring
system are shown in Fig. 1. Temperature sensors measure the
internal temperature of the pavement and moisture sensors
measure the moisture content of the roadbed.
Figure 1. Field monitoring system and sensors
2.2 Field monitoring region
The field monitoring region is divided into three regions by
freezing index 550~650°C·day, 450~550°C
·
day, and
350~450°C
·
day. Each region has three-section of road
pavement such as cutting area, boundary area of cutting and
banking, and lower area of banking. A total 25 sections for three
regions (9 section in cutting area, 9 section in boundary area of
cutting and banking, and 7 section in lower area of banking)
were constructed as tabulated in Table 1.
