A Study on Temperature Reduction Characteristics of Coated Rails Considering Correlation with Ambient Temperature

Jinseong Park; Hyuksang Jung; Seongmin Jang; Tran Hamy

doi:10.14481/jkges.2026.27.8.5

All Issue

2026 Vol.27, Issue 8 Next Page

A Study on Temperature Reduction Characteristics of Coated Rails Considering Correlation with Ambient Temperature 대기온도와의 상관성을 고려한 차열도료 도포 레일의 온도 저감 특성 연구

1 August 2026. pp. 5-12

PDF XML

Abstract

As the frequency of summer heatwaves increases due to recent global warming, the risk of track buckling caused by rising rail temperatures in Continuous Welded Rail (CWR) is intensifying. In this study, the temperature reduction effect of thermal barrier paint was empirically analyzed through indoor simulation experiments using 50 kg rails, and a management standard for ambient temperature was proposed based on the correlation between ambient and rail temperatures. The uncoated rail temperature was measured up to 18.6 °C higher than the ambient temperature during peak hours, while the application of thermal barrier paint resulted in an average reduction of 1 to 2 °C and a maximum reduction of over 5 to 6 °C. A unified regression model incorporating position-specific correction variables (α) was proposed based on high linear correlation (R² ≥ 0.90). The critical ambient temperature was calculated at approximately 52~53 °C for uncoated rails, increasing to approximately 54~59 °C with thermal barrier paint application, representing a delay of up to 7 °C. These findings are expected to serve as quantitative data for summer railway maintenance and intelligent track temperature prediction systems.

Keywords

Continuous Welded Rail

Thermal Barrier Paint

Rail Temperature

Buckling

Critical Temperature

최근 지구 온난화로 인한 하절기 폭염 발생 빈도 증가에 따라 장대레일의 궤도 장출(Buckling) 사고 위험이 가중되고 있다. 본 연구에서는 50 kg 레일을 대상으로 실내 모사 실험을 통해 차열도료의 온도 저감 효과를 실증적으로 분석하고, 대기온도와 레일 온도 간의 상관관계를 토대로 관리 기준 대기온도를 제안하였다. 분석 결과, 피크 시간대 미도포 레일은 대기온도 대비 최대 18.6 ℃ 높게 측정되었으며, 차열도료 도포 시 평균 1~2 ℃, 최대 5~6 ℃ 이상의 저감 효과가 나타났다. 대기온도와 레일 온도 간의 높은 선형 상관성(R² ≥ 0.90)을 바탕으로 부위별 보정 변수(α)를 적용한 통합 회귀 모델을 제안하였으며, 레일 운행 중지 임계치(64 ℃) 기준 관리 대기온도는 미도포 레일 약 52~53 ℃, 도포 레일 약 54~59 ℃로 최대 7 ℃의 임계 시점 지연 효과가 도출되었다. 본 연구 결과는 하절기 철도 유지관리 및 지능형 궤도 온도 예측 시스템 구축을 위한 정량적 기초 자료로 활용될 것으로 기대된다.

키워드

장대레일

차열도료

레일 온도

궤도 장출

한계온도

References

Choi, J. Y., Lee, G. S., Bae, H. W., Park, B. H. and Lim, N. H. (2010), A study on temperature characteristics of continuous welded rail in preparation for climate change, Journal of the Korean Railway Society, Vol. 13, No. 2, pp. 179~185 (In Korean).

Choi, J. Y., Lee, G. S., Bae, H. W., Park, B. H. and Lim, N. H. (2018), Analysis of rail deformation according to temperature distribution of rail, Journal of the Korean Society of Hazard Mitigation, Vol. 18, No. 2, pp. 33~38 (In Korean).

10.9798/KOSHAM.2018.18.2.33

KORAIL (2024), Maintenance guidelines for rail temperature detection devices, pp. 6~7 (In Korean).

Lee, H. G. (2020), Effect of thermal barrier paint on continuous welded rail through laboratory test, Master's thesis, Seoul National University of Science and Technology, pp. 40~55 (In Korean).

National Institute of Meteorological Sciences (2020), Climate change outlook report 2020 for the Korean peninsula: climate change outlook according to SSP1-2.6/SSP5-8.5, Report, National Institute of Meteorological Sciences (In Korean).

Park, J. Y. and Kang, D. H. (2021), A study on the influence factors of coating thickness of thermal insulation paints to prevent buckling of CWR in summer season, Journal of the Korean Society for Urban Railway, Vol. 9, No. 4, pp. 239~247 (In Korean).

10.24284/JKOSUR.2021.12.9.4.1091

Park, J. Y., Lee, H. W. and Kang, D. H. (2022), Thermal insulation performance: change of thermal insulation paint applied to CWR exposed to vibration, Journal of the Korean Society of Hazard Mitigation, Vol. 22, No. 2, pp. 171~178 (In Korean).

10.9798/KOSHAM.2022.22.2.171

Seong, D. R., Ju, J. W., Park, S. K., Jeon, D. M., Lee, H. G., Kim, J. G. and Baek, C. H. (2012), Application of thermal barrier paint for temperature control of continuous welded rail in summer, Korean Railway Society Conference, Korean Railway Society, pp. 265~271 (In Korean).

Information

Publisher :Korean Geo-Environmental Society
Publisher(Ko) :한국지반환경공학회
Journal Title :Journal of the Korean Geo-Environmental Society
Journal Title(Ko) :한국지반환경공학회 논문집
Volume : 27
No :8
Pages :5-12
Received Date : 2026-05-08
Revised Date : 2026-05-19
Accepted Date : 2026-07-01
DOI :https://doi.org/10.14481/jkges.2026.27.8.5

Journal of the Korean Geo-Environmental Society ISSN:1598-0820(Print) 2714-1233(Online) 한국지반환경공학회 논문집

All Issue