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Finite Element Analysis of Heat Transfer Effects on Asphalt Pavement Heated by Pre-Heater Unit Used in Hot In-Place Recycling

유한요소해석을 통한 현장 가열 재활용 시공 장비의 가열판 용량에 따른 아스팔트 포장의 열전도성 평가

Lee, Kang Hun;Lim, Jin Sun;Jeong, Kyu Dong;Im, Jeong Hyuk;Kwon, Soo Ahn;Kim, Yong Joo
이강훈;임진선;정규동;임정혁;권수안;김용주

  • Received : 2016.03.14
  • Accepted : 2016.03.30
  • Published : 2016.04.14

Abstract

PURPOSES: The national highways and expressways in Korea constitute a total length of 17,951 km. Of this total length of pavement, the asphalt pavement has significantly deteriorated, having been in service for over 10 years. Currently, hot in-place recycling (HIR) is used as the rehabilitation method for the distressed asphalt pavement. The deteriorated pavement becomes over-heated, however, owing to uncontrolled heating capacity during the pre-heating process of HIR in the field. METHODS: In order to determine the appropriate heating method and capacity of the pre-heater at the HIR process, the heating temperature of asphalt pavement is numerically simulated with the finite element software ABAQUS. Furthermore, the heating transfer effects are simulated in order to determine the inner temperature as a function of the heating system (IR and wire). This temperature is ascertained at $300^{\circ}C$, $400^{\circ}C$, $500^{\circ}C$, $600^{\circ}C$, $700^{\circ}C$, and $800^{\circ}C$ from a slab asphalt specimen prepared in the laboratory. The inner temperature of this specimen is measured at the surface and five different depths (1 cm, 2 cm, 3 cm, 4 cm, and 5 cm) by using a data logger. RESULTS: The numerical simulation results of the asphalt pavement heating temperature indicate that this temperature is extremely sensitive to increases in the heating temperature. Moreover, after 10 min of heating, the pavement temperature is 36%~38% and 8%~10% of the target temperature at depths of 25 mm and 50 mm, respectively, from the surface. Therefore, in order to achieve the target temperature at a depth of 50 mm in the slab asphalt specimen, greater heating is required of the IR system compared to that of the gas. CONCLUSIONS : Numerical simulation, via the finite element method, can be readily used to analyze the appropriate heating method and theoretical basis of the HIR method. The IR system would provide the best heating method and capacity of HIR heating processes in the field.

Keywords

hot in-place recycling;pre-heater;heat transfer;finite element method

References

  1. Kim, Dae-Hun, Kim, Seung-Hoon, Kwon, Soo-Ahn, Kim, Yongjoo, Lee, Jaejun,(2015), Fundamental Study for Development of Pre-Heater for Warm In-Place Recycling in Korea, Journal of the Korean Society of Road Engineers 17(2), pp.31-37.
  2. Li, H., Harvey, J., and Jones, D.,(2013), Multi dimensional transient temperature simulation and back-calculation for thermal properties of building materials, Building and Environment, Vol. 59, No. 1, pp. 501-516. https://doi.org/10.1016/j.buildenv.2012.09.019
  3. Ministry of Land, Infrastructure and Transportation, (2015), "Yearbook of Road Statistics", Korea.
  4. Zhang, D., Ma, T., Huang, X., Chen, C., Gu, F., and Jin, J., (2011), "Heating Temperature Control for Hot In-Place Recycling of SMA Asphalt Pavement", Transportation Research Board 90th Annual Meeting. Washington, D.C. Paper DVD #11-1662.

Acknowledgement

Grant : 온실가스 배출 최소화를 위한 친환경 포장 도로 연구

Supported by : 국토교통부, 국토교통과학기술진흥원