Simulation Analysis and Optimization of Temperature Field for Hot In-Place Asphalt Pavement Recycling
Publication: Journal of Transportation Engineering, Part B: Pavements
Volume 149, Issue 2
Abstract
The heating temperature field of asphalt pavement is a key factor affecting the quality of pavement heat-in-place recycling (HIR). Using the heat transfer characteristics of HIR, a three-dimensional heat transfer model was simplified into a one-dimensional heat transfer model along the depth direction. A temperature sensor was installed on the site to monitor the temperature change of the asphalt pavement at different depths under different heating powers, and the actual temperature and heat transfer model were highly compatible. Through this model, the influence of heater running speed and heater heat flux density on the temperature field of the asphalt pavement heated by infrared radiation (IR) was calculated by the finite differential method, and an optimal combination of heating is proposed. In accordance with construction continuity and minimum energy consumption principles, at the recommended running speed of the heating machine, the asphalt at a depth of 4 cm satisfied the temperature demand, but the asphalt on the road surface was prone to heat aging. The heating effect of the constant temperature variable power heating (CTVP) is ideal, but the continuous change in heating power increases the difficulty of construction. Constant temperature discrete power heating (CTDP) divides the ideal heat flux density curve into several stages according to the length of the heating plate in the heater, increasing the feasibility of constant temperature heating in engineering and reducing energy consumption.
Practical Applications
The mileage of roads in some countries has basically satisfied the needs of national development, and the research focus of road workers has gradually shifted from building new roads to the renovation and maintenance of existing roads. In order to meet the purposes of convenient transportation and environmental protection at the same time, construction optimization must be carried out in the process of road renovation and maintenance to ensure that energy is not wasted during the construction process, and the relevant requirements of construction specifications are met. At present, high proportion of paved roads throughout the world have asphalt pavement. HIR has gradually become a popular maintenance method in order to save resources. In this method, the heating temperature field of the original asphalt pavement plays a key role in the construction quality, and the temperature field is affected by many factors, such as the running speed of the heater and the heat flux density of the heater during the heating process. This study mainly considers the foregoing two factors, combined with the actual situation of the project, in order to find a heating method with excellent heating effects and simple construction. The heating effect of the pavement is further optimized, improving the quality of the project, while saving energy and reducing the project cost.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
This work was supported by a grant from the National Natural Science Foundation of China (No. 52078132) and the Scientific Research Foundation of Graduate School of Southeast University. The authors gratefully acknowledge their financial support. In addition, thank you to all the authors of papers cited in the References.
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Information
Published In
Journal of Transportation Engineering, Part B: Pavements
Volume 149 • Issue 2 • June 2023
Copyright
© 2023 American Society of Civil Engineers.
History
Received: May 2, 2022
Accepted: Jan 5, 2023
Published online: Mar 8, 2023
Published in print: Jun 1, 2023
Discussion open until: Aug 8, 2023
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