Hot asphalt recycling technology is mainly used to treat surface defects in asphalt pavements, provided the overall strength of the asphalt pavement meets requirements. Based on years of research and engineering experience from our clients, combined with the characteristics, causes, and related research findings of asphalt pavement defects in my country, we have analyzed the applicability of in-situ hot recycling technology from different perspectives. So, what is the technical analysis of hot asphalt recycling construction?

What is the technical analysis of hot asphalt recycling construction?
1. Hot asphalt recycling utilizes hot asphalt pavement recycling units to complete the hot recycling and repair of asphalt pavements on-site. It uses 100% of the original pavement materials; therefore, there is no need to transport and stockpile waste, reducing environmental pollution. It can change the composition of a single mixture, thus providing a different asphalt mixture ratio; it allows for rapid on-site recycling, and road traffic can resume as the project progresses, with minimal traffic disruption.
2. Hot asphalt recycling refers to the on-site recycling of the original asphalt pavement. First, the original asphalt pavement is heated and softened to facilitate leveling. Then, the leveled asphalt pavement is thoroughly mixed, followed by paving and compaction. The aging of asphalt pavement is mainly caused by the reduction of lightweight components in asphalt and the loss of aggregate.
3. Asphalt thermal recycling involves adding a recycling agent to adjust the chemical composition of the old asphalt pavement, while simultaneously adding a small amount of fresh asphalt mixture to adjust the gradation of the original asphalt mixture, thereby restoring the performance of the aged asphalt and achieving the effect of asphalt pavement recycling. New asphalt mixture and recycling agent are added in the required proportions. Generally, the proportion of new asphalt mixture should be controlled within 30% of the recycled mixture. The addition rate of various materials is determined based on the performance analysis of the original asphalt pavement and its laboratory mix design, and according to the corresponding mixture specifications.
4. Depending on the process used, on-site thermal recycling can be subdivided into three types: rake grinding, plastic recycling, and surface resurfacing and remixing.
5. Rake-and-shape recycling: First, the asphalt pavement is heated and softened using a heating device, then the pavement is leveled and shaped using the provided rake, while a recycling agent is added, and finally, the asphalt pavement is compacted with a road roller.
6. Resurfacing recycling: First, the asphalt pavement is heated and softened using heating equipment, then the old asphalt layer is milled. The difference is that the milled asphalt is laid directly on top, followed by a layer of new asphalt mixture, and then compacted with a road roller.
7. Mixture Recycling: First, the asphalt pavement is heated and softened using heating equipment. Then, the old asphalt layer is milled using a milling machine. A recycling agent is added in a certain proportion, along with new materials to adjust the mixture. The mixed material is collected, spread on a paver, and compacted with a road roller.