在道路的生命周期中，随着时间的推移和交通荷载的不断作用，路面会逐渐出现各种病害，如裂缝、车辙、坑槽等。为了恢复道路的使用性能，延长其使用寿命，道路养护工作关重要。而就地冷再生技术，作为一种、且经济的养护方法，正逐渐在道路工程领域崭露头角。

　　In the lifecycle of roads, with the passage of time and the continuous action of traffic loads, various diseases such as cracks, ruts, potholes, etc. will gradually appear on the road surface. In order to restore the performance and prolong the service life of roads, road maintenance work is crucial. On site cold recycling technology, as an efficient, environmentally friendly, and economical maintenance method, is gradually emerging in the field of road engineering.

　　01就地冷再生技术的核心原理

　　The core principle of on-site cold regeneration technology

　　就地冷再生技术（In-Situ Cold Recycling）是一种直接在原路面上进行的道路修复工艺，通过破碎旧路面材料（沥青层或部分基层），加入再生剂（如泡沫沥青、乳化沥青、水泥等），经拌和、摊铺、压实后形成新的路面结构层。该技术实现旧料100%循环利用，属于绿色可持续的道路养护技术。

　　In Situ Cold Recycling is a road repair process that is directly carried out on the original pavement. By crushing the old pavement materials (asphalt layer or part of the base course), adding regenerants (such as foam asphalt, emulsified asphalt, cement, etc.), a new pavement structure layer is formed after mixing, paving, and compaction. This technology achieves 100% recycling of old materials and belongs to green and sustainable road maintenance technology.

　　以泡沫沥青冷再生为例，其原理是将常温水注入热沥青中，使沥青瞬间膨胀形成大量沥青泡沫 。这些泡沫破裂后与集料接触，化为无数“小颗粒”散布于细集料表面，形成粘有大量沥青的细料。经过拌和压实，细料填充粗料间空隙，让混合料达到稳定状态，从而形成性能良好的路面结构层。

　　Taking the cold recycling of foam asphalt as an example, the principle is to inject normal temperature water into hot asphalt to make asphalt expand instantaneously to form a large amount of asphalt foam. These foam come into contact with the aggregate after breaking and become numerous "small particles" scattered on the surface of the fine aggregate, forming fine aggregate with a large amount of asphalt. After mixing and compacting, fine materials fill the gaps between coarse materials to achieve a stable state of the mixture, thereby forming a high-performance pavement structure layer.

　　02因地制宜：不同就地冷再生技术的选用策略

　　02 Tailored to local conditions: selection strategies for different on-site cold recycling technologies

　　水泥混凝土路面全厚式移动破碎就地冷再生：是指利用移动破碎设备，就地将旧水泥混凝土路面板全厚度破碎成具有一定级配的再生集料（或者通过添加适量的新集料后使再生集料的合成级配满足公路水泥稳定碎石基层的级配要求），然后添加再生剂（通常是水泥，或者掺配一定比例的其它胶凝结合料）、活性剂（如钢渣超微粉等，改善再生结构层的性能）、水后，通过再生机就地拌和成水泥稳定碎石混合料，经初压、整平、终压、养生，终形成一定厚度的再生水泥稳定（或其它材料稳定）碎石基层（或者中、下面层）。

　　Full thickness mobile crushing on-site cold recycling of cement concrete pavement: refers to the use of mobile crushing equipment to crush the entire thickness of old cement concrete pavement panels into recycled aggregates with a certain grading (or by adding an appropriate amount of new aggregates to make the composite grading of recycled aggregates meet the grading requirements of highway cement stabilized crushed stone base), and then adding recycling agents (usually cement, or mixed with a certain proportion of other cementitious binders), active agents (such as steel slag ultrafine powder, etc., to improve the performance of the recycled structural layer), water, and then mixing them on site with a recycling machine to form a cement stabilized crushed stone mixture. After initial pressing, leveling, final pressing, and curing, a certain thickness of recycled cement stabilized (or other material stabilized) crushed stone base is finally formed. Or the middle and lower layers.

　　沥青路面就地冷再生双层连铺技术：是指使用两套后出料模式的就地冷再生机机组，依次对原沥青路面的沥青面层进行泡沫沥青就地冷再生和水稳基层进行水泥就地冷再生，在水稳基层冷再生层压实后（初凝前）铺设泡沫沥青冷再生混合料，从而双层冷再生一次性完成的沥青路面结构性修复技术。

　　In situ cold recycling double-layer continuous paving technology of asphalt pavement: it refers to the structural repair technology of asphalt pavement that uses two sets of in situ cold recycling machine units in the rear discharge mode to carry out foam asphalt in situ cold recycling on the asphalt surface course of the original asphalt pavement and cement in situ cold recycling on the water stabilized base course in turn. After the cold recycling layer of the water stabilized base course is compacted (before initial setting), foam asphalt cold recycling mixture is paved, so that the double-layer cold recycling can be completed once.

　　03绿色低碳与降本

　　03 Green, low-carbon and efficient cost reduction

　　△效益显著传统的道路维修方式往往会产生大量的废旧路面材料，这些废料如果处理不当，不仅占用大量土地资源，还会对环境造成严重污染。而就地冷再生技术能将旧路面材料100%回收利用，大大减少了新材料的开采，降低了资源消耗和废弃物排放。同时，冷再生施工过程无需加热，减少了燃料消耗和有害气体排放，助力实现绿色低碳的道路建设与养护目标。

　　The traditional road maintenance methods often generate a large amount of waste road materials, which, if not handled properly, not only occupy a large amount of land resources but also cause serious pollution to the environment. On site cold recycling technology can recycle 100% of old pavement materials, greatly reducing the extraction of new materials, resource consumption, and waste emissions. At the same time, the cold recycling construction process does not require heating, reducing fuel consumption and harmful gas emissions, and helping to achieve the goal of green and low-carbon road construction and maintenance.

　　△经济效益突出使用就地冷再生技术，由于大量利用旧路面材料，减少了新材料的购置成本，同时降低了废料运输和处理费用。而且施工工序相对简化，施工工期缩短，进一步降低了施工成本。据统计，与传统铣刨罩面维修方法相比，采用泡沫沥青冷再生技术可节约成本25%左右。

　　The outstanding economic benefits are achieved through the use of on-site cold recycling technology. Due to the extensive utilization of old pavement materials, the purchase cost of new materials is reduced, while the transportation and disposal costs of waste materials are also lowered. Moreover, the construction process is relatively simplified, the construction period is shortened, and the construction cost is further reduced. According to statistics, compared with the traditional milling overlay maintenance method, the use of foam asphalt cold recycling technology can save about 25% of the cost.

　　△社会效益明显就地冷再生技术施工速度快，能快速恢复道路通行能力，减少施工对交通的影响，降低因交通拥堵造成的社会经济损失。同时，这种技术可以提升道路的使用性能和服务水平，为公众提供更、舒适的出行条件。

　　The on-site cold recycling technology has significant social benefits, with fast construction speed, which can quickly restore road traffic capacity, reduce the impact of construction on traffic, and lower the socio-economic losses caused by traffic congestion. At the same time, this technology can improve the performance and service level of roads, providing safer and more comfortable travel conditions for the public.

　　04旧路新颜：就地冷再生技术应用案例

　　04 New Look on Old Road: Application Case of On site Cold Recycling Technology

　　在全国各地，就地冷再生技术已经得到了广泛的应用。如在湖南省内沅陵S318国道大修项目中，采用了水泥混凝土路面全厚式移动破碎就地冷再生技术。经过持续跟踪调查，实施效果良好，芯样完整，与罩面衔接紧密 。还有在广西贵港市S204路面中修工程中，应用基于同步摊铺工艺的泡沫沥青就地冷再生技术，对原路面进行修复。该技术一次性再生一条车道，同时完成铣刨、破碎、添加泡沫沥青和水、拌和等工序，施工效率高，经济效益显著。

　　In various parts of the country, on-site cold recycling technology has been widely applied. In the S318 National Highway overhaul project in Yuanling, Hunan Province, the full thickness mobile crushing on-site cold recycling technology for cement concrete pavement was adopted. After continuous tracking and investigation, the implementation effect is good, the core sample is complete, and it is closely connected with the cover. In addition, in the medium repair project of S204 pavement in Guigang City, Guangxi, foam asphalt in place cold recycling technology based on synchronous paving process is applied to repair the original pavement. This technology can regenerate one lane at a time, and complete milling, crushing, adding foam asphalt and water, mixing and other processes at the same time, with high construction efficiency and significant economic benefits.

　　道路就地冷再生技术凭借其独特的优势，为道路养护和修复提供了一种创新且的解决方案。随着技术的不断发展和完善，相信它将在未来的道路建设中发挥更加重要的作用让更多的旧路实现“新生”。

　　The on-site cold recycling technology for roads, with its unique advantages, provides an innovative and efficient solution for road maintenance and repair. With the continuous development and improvement of technology, it is believed that it will play a more important role in future road construction, enabling more old roads to achieve "rebirth".

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