Journal of the Korean Geosynthetics Society (한국지반신소재학회논문집)

Korean Geosynthetics Society (한국지반신소재학회)
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Freezing and Deflection Characteristics of Flexible Pavement Structure Using Frost Model Test

동상모형실험을 통한 아스팔트 포장체의 동결 및 처짐 특성

  • 신은철 (인천대학교 건설환경공학과) ;
  • 황순갑 (인천대학교 건설환경공학과, 지수건설(주)) ;
  • 박정준 (인천대학교 건설환경공학과)
  • Received : 2012.08.13
  • Accepted : 2012.09.14
  • Published : 2012.09.30
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Abstract

In this paper, the frost heaving and thawing characteristics of flexible pavement structure were evaluated in the large scale freezer which have a specification of temperature range $-20^{\circ}C{\sim}10^{\circ}C$ and $3.2m(L){\times}3.2m(B){\times}2.4m(H)$ in size. The insulated steel box with the size of $0.9m(L){\times}0.9m(B){\times}0.9m(H)$ was used to simulate actual pavement road structure. The variation of temperature, frost heave amount and frost heave pressure were measured through the instrument of TDS-602 data logger. LFWD (light falling weight deflectometer) was used to determine the change of deflection due to the frost heaving and thawing. Furthermore, the influence of aggregate layer to the freezing of the subgrade soil was studied to verify the function and effectiveness of the anti-freezing layer.

본 논문에서는 $-20^{\circ}C{\sim}10^{\circ}C$의 온도 유지가 가능한 길이 3.2m, 폭 3.2m, 높이 2.4m의 대형 냉동고 내부에 길이 0.9m, 폭 0.9m, 높이 0.9m의 실험용 토조를 실제 도로 아스팔트 포장체의 형상과 유사하게 구성하여 실험 조건에 따른 시료 깊이별 온도변화, 동상 팽창압, 팽창량 등 도로의 동결 특성을 분석하였다. 또한, 소형충격재하 장치(LFWD)를 활용하여 동결 전과 융해 후 도로포장구조체의 동상방지층 유무에 따른 실험을 실시하여 아스팔트 포장체 표면의 처짐을 측정하였다. 즉, 도로포장 중앙부의 처짐비와 표층곡률지수비를 분석, 평가함으로써 도로동상방지층의 효용성 및 공용성을 규명하였다.

Keywords

References

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  1. Relationship between deformation moduli obtained using light falling weight deflectometer and static plate test on various types of soil vol.9, pp.4, 2014, https://doi.org/10.3846/bjrbe.2014.31
  2. The Frost Heaving Susceptibility Evaluation of Subgrade Soils Using Laboratory Freezing System vol.12, pp.2, 2013, https://doi.org/10.12814/jkgss.2013.12.2.013