Performance and impact analysis of key structural parameters of hot in-place recycling equipments used on hot-air circulated asphalt road

In the paper, a three-dimensional model of heating temperature field distribution of hot in-place recycled road is established. Fluent analysis was used to simulate hot wind cycle, and transient thermal to simulate hot wind heating road surface, thereby the temperature field distribution of road surface was quickly calculated. The finite element method is adopted to calculate how each layer of temperature field distribution of roads changes with some heating machine parameters. The results show that each layer of temperature field distribution of roads is more even; and that the heating efficiency is the highest when the rows of heating air vents are 5, the diameter size of vents is 30 mm, the height of the ventilation centre from the ground is 170 mm, and the speed of hot air circulation is between 3 m/s and 4 m/s. The paper provides a reference to the structural design of hot in-place recycling equipment.