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.

沥青再生养护技术包括冷再生与热再生，其中包括了就地冷再生、厂拌冷再生、就地热再生和厂拌热再生。

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.

什么是就地冷再生与就地热再生呢？

What are on-site cold regeneration and on-site geothermal regeneration?

就地冷再生（CIR）是指采用专用的就地冷再生设备，对沥青路面进行现场冷铣刨、破碎和筛分（必要时），渗入一定数量的新集料、再生结合料、活性填料（水泥、石灰等）、水，经过常温拌和、摊铺、碾压等工序，一次性实现旧沥青路面再生的技术，它包括沥青层就地冷再生和全深式就地冷再生两种方式。仅对沥青材料层进行的就地冷再生称为沥青层就地冷再生。沥青层就地冷再生是一种循环利用的再生技术，再生后的材料仍将用于沥青层，主要用于道路的联结层、下面层或柔性基层，也常用于乡村道路的翻修。再生层既包括沥青面层又包括非沥青材料层。称为全深式就地冷再生。全深式就地冷再生可以解决沥青路面面层、基层的所有病害，但其施工工序复杂、施工成本高。

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.

就地热再生（HIR）是通过现场加热、翻松、拌和、摊铺、碾压等工序，一次性实现旧沥青路面材料的100%就地再生利用的路面再生技术，施工过程中具有无须铣刨、收集和运输旧路面沥青混合料等优点。此外，就地热再生施工速度快，效率高，通常采用单车道施工，对道路运营影响程度低。但需要非标准化施工设备，对设备的功能和性能要求较高。

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.