Multi-stage heating technology for asphalt pavement hot in-place recycling using controlled heating power

ABSTRACT

Hot in-place recycling allows the rehabilitation of worn asphalt pavement with minimal resources. However, it is limited by the heating rate of asphalt pavement. Temperature field distribution was calculated and analyzed in traditional single-stage heating technology (SHT) with constant temperature heating mode. Multi-stage heating technology (MHT) was proposed to improve the heating rate by decreasing the depth to which the asphalt pavement was heated at a given time. The asphalt pavement temperature fields were calculated for SHT and MHT. The calculation results accurately described the temperature field of the asphalt pavement, and the heating rate of MHT was over half that of SHT.

KEYWORDS:

• Asphalt pavement
• hot in-place recycling
• multi-stage heating technology
• single-stage heating technology
• temperature field

Acknowledgments

The authors would like to thank Shaanxi Provincial Science and Technology Department (No. 2022PT-30) and Key Laboratory of Intelligent Manufacturing of Construction Machinery (No. IMCM2021KF02) and Zhejiang Provincial Transportation and Technology Department (No. 2021011) and Henan Province Workshop of Outstanding Foreign Scientists (No. GZS2022004) the Fundamental Research Funds for the Central Universities,CHD (No. 300102252104) and Key Technological Special Project of Xinxiang city (No. 22ZD013).

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work was supported by Shaanxi Provincial Innovation Capacity Support Plan: [grant no 2022PT-30]; Technology Project of Zhejiang Provincial Department of Transportation: [grant no 2021011]; Fundamental Research Funds for the Central Universities,CHD: [grant no 300102252104]; Henan Outstanding Foreign Scientist Workshop: [grant no GZS2022004]; Key Laboratory of Intelligent Manufacturing of Construction Machinery: [grant no IMCM2021KF02]; Key Technological Special Project of Xinxiang city [grant no 22ZD013].