The recycling and utilization of old asphalt pavement materials refers to a complete process of excavating, milling, recycling, heating, crushing, and screening the asphalt pavement through specialized equipment for recycling, and then remixing it with recycled agents, new asphalt, and new aggregates in a certain proportion to meet certain road performance and re lay it on the pavement.
The asphalt recycling and maintenance technology includes cold recycling and hot recycling, including on-site cold recycling, plant mixed cold recycling, on-site geothermal recycling, and plant mixed hot recycling.
What are on-site cold regeneration and on-site geothermal regeneration?
In situ cold recycling (CIR) refers to the technology of using specialized in situ cold recycling equipment to perform on-site cold milling, crushing, and screening (if necessary) on asphalt pavement, infiltrating a certain amount of new aggregates, recycled binders, active fillers (cement, lime, etc.), and water, and achieving one-time regeneration of old asphalt pavement through processes such as mixing, paving, and rolling at room temperature, It includes two methods: on-site cold regeneration of asphalt layer and full depth on-site cold regeneration. The on-site cold regeneration of only the asphalt material layer is called on-site cold regeneration of the asphalt layer. In situ cold recycling of asphalt layer is a recycling technology, and the recycled material will still be used for the asphalt layer, mainly for the connecting layer, lower layer or flexible base of roads, and also commonly used for the renovation of rural roads. The recycled layer includes both asphalt surface layer and non asphalt material layer. It is called full depth on-site cold regeneration. Full depth on-site cold regeneration can solve all diseases of asphalt pavement surface and base layer, but its construction process is complex and the construction cost is high.
On site geothermal regeneration (HIR) is a road surface regeneration technology that achieves 100% on-site recycling of old asphalt pavement materials through on-site heating, scarifying, mixing, paving, rolling, and other processes. During the construction process, it has the advantages of no milling, collection, and transportation of old asphalt mixture. In addition, geothermal regeneration construction is fast and efficient, usually using single lane construction, which has a low impact on road operation. However, non-standard specialized construction equipment is required, and the functional and performance requirements of the equipment are high.