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

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. [ABSTRACT FROM AUTHOR]