就地冷再生属于道路维修、改造的范畴，它主要解决沥青路面上基层破损的问题，在常温下利用冷再生专用设备对沥青路面连续完成冷铣刨、破碎旧路面结构层(包括面层和部分基层)、添加再生材料、常温拌和和摊铺等作业过程，碾压成型后的摊铺层可作为低等级公路的面层和高等级公路的下面层或基层。根据再生添加剂的不同，主要分为泡沫沥青就地冷再生技术、水泥就地冷再生技术和乳化沥青就地冷再生技术，目前水泥就地冷再生机应用较为广泛。就地冷再生技术不仅能够充分发挥旧沥青混合料的“剩余价值”，也促进旧路面材料的循环利用，保护生态环境，减少资源浪费。

On site cold recycling belongs to the category of road maintenance and renovation. It mainly solves the problem of damage to the base layer of asphalt pavement. At room temperature, special cold recycling equipment is used to continuously perform cold milling, crushing of the old pavement structure layer (including the surface layer and some base layers), adding recycled materials, mixing and paving at room temperature on the asphalt pavement. The compacted paving layer can be used as the surface layer of low-grade highways and the lower layer or base layer of high-grade highways. According to the difference of recycling additives, it is mainly divided into foam asphalt in situ cold recycling technology, cement in situ cold recycling technology and emulsified asphalt in situ cold recycling technology. At present, cement in situ cold recycling machine is widely used. On site cold recycling technology can not only fully utilize the "residual value" of old asphalt mixtures, but also promote the recycling of old pavement materials, protect the ecological environment, and reduce resource waste.

就地冷再生技术主要针对沥青路面大中修改造中旧路面特殊处理的一种新技术，主要施工机具为集破碎与拌和为一体的冷再生机。冷再生机的核心是装有大量专用刀头的铣刨和拌和转子。转子向上旋转铣刨原路面材料，冷再生机向前行进时，转子转动，同时水通过软管从再生机连接的水车中运送过来，并在再生机的拌和仓中喷洒。水的输送量通过微处理器控制的泵送系统精确控制。铣刨转子将水、添加剂（水泥、碎石需事先按计量撒布）和铣刨料充分拌和，并达到需要的最佳含水量，从而达到混合料的最大压实度。

On site cold recycling technology is a new technology mainly aimed at the special treatment of old pavement in the major and medium maintenance and renovation of asphalt pavement. The main construction equipment is a cold recycling machine that integrates crushing and mixing. The core of a cold recycling machine is a milling and mixing rotor equipped with a large number of specialized cutting heads. The rotor rotates upwards to mill the raw road surface material, and when the cold recycling machine moves forward, the rotor rotates. At the same time, water is transported from the water truck connected to the recycling machine through a hose and sprayed in the mixing bin of the recycling machine. The water delivery volume is precisely controlled by a microprocessor controlled pumping system. The milling rotor thoroughly mixes water, additives (cement, crushed stone need to be pre measured and spread), and milling materials to achieve the optimal moisture content required, thereby achieving the maximum compaction degree of the mixture.

如遇再生层原级配不良的情况，可在再生前将所有缺少的部分集料撒布在路面上，通过与旧料拌和来改善原路面材料的级配，这一便捷的优势大大提高了施工效率，就地冷再生技术具有诸多优点，概括起来可归纳为以下几点：

In case of poor grading of the recycled layer, all missing aggregates can be scattered on the road surface before regeneration, and the grading of the original road material can be improved by mixing with the old material. This convenient advantage greatly improves construction efficiency. The on-site cold recycling technology has many advantages, which can be summarized as follows:

1、成本低

1. Low cost

由于就地冷再生技术全部利用了旧路的铺筑材料，从而减少了道路维修或改造时旧铺层材料的挖起运输、废置和新材料的购置，从而导致成本大幅度下降。采用道路就地冷再生比传统方式相比，随着再生层厚度的不同，大概可以降低成本10%-20%，厚度越深，降低成本越多。在高等级路面基层中因原材料的再利用可节省大量投资，在低等级路面中，因用冷再生工艺可提高路面基层等级而减小面层的投入。

Due to the fact that on-site cold recycling technology fully utilizes the paving materials of old roads, it reduces the excavation and transportation of old paving materials, waste disposal, and the purchase of new materials during road maintenance or renovation, resulting in a significant reduction in costs. Compared with traditional methods, using on-site cold regeneration on roads can reduce costs by approximately 10% -20% depending on the thickness of the regeneration layer. The deeper the thickness, the more cost reduction can be achieved. In high-grade pavement base, the reuse of raw materials can save a lot of investment, while in low-grade pavement, the use of cold recycling technology can improve the pavement base grade and reduce the investment in surface layers.

2、效率高

2. High efficiency

就地冷再生技术设备施工一次性可以完成铣刨、破碎、添加、拌和及摊铺，从而简化了施工程序，缩短施工工期。使用就地冷再生设备，每天施工可完成5000-8000m2的工作量，养生3-5天后可进行上基层或面层的施工，对工程总进度基本无影响。 此外，冷再生施工的特点是大型机械，密集施工，将因施工而造成的交通干扰降到了最低。整个冷再生机械组合可以处于同一条车道内，不影响另一条车道车辆通行，可进行开放式施工，特别适用于交通量较大或路宽较窄情况下的道路的施工。

The on-site cold recycling technology equipment can complete milling, crushing, adding, mixing, and paving in one go, simplifying the construction process and shortening the construction period. By using on-site cold recycling equipment, a daily construction workload of 5000-8000m2 can be completed. After 3-5 days of curing, the construction of the base or surface layer can be carried out, with little impact on the overall progress of the project. In addition, the characteristics of cold recycling construction are large machinery and intensive construction, which minimizes traffic interference caused by construction. The entire cold recycling machinery assembly can be located in the same lane without affecting the passage of vehicles in another lane, and can be constructed in an open manner, especially suitable for construction on roads with high traffic volume or narrow road width.

3、质量好

3. Good quality

就地冷再生可以根据旧路不同铺筑材料的实际情况进行设计，选择不同的添加剂和配比，可以保证再生材料的优秀品质和施工质量，形成施工成型厚而均匀的粘结层，从而保证了维修后道路的使用期限。如2014年江西宜春市G320大中修时采用水泥就地冷再生技术，经5天后取芯，芯样不但完整而且再生层与原基层粘结完好成为一整体。

On site cold recycling can be designed according to the actual situation of different paving materials on old roads, selecting different additives and ratios to ensure the excellent quality and construction quality of recycled materials, forming a thick and uniform bonding layer during construction, thereby ensuring the service life of the repaired road. In 2014, during the G320 major maintenance in Yichun City, Jiangxi Province, cement in-situ cold recycling technology was used. After 5 days of core sampling, the core sample was not only intact but also the recycled layer was well bonded to the original base layer, forming a whole.

4、污染少

4. Less pollution

使用传统的道路维修方法，沥青路面废弃量十分巨大，对环境造成污染，大量新材料的开采，也会造成资源减少和环境的破坏，而且废气量和能耗也是巨大的。采用冷再生技术则可完全避免上述问题。它不仅可以节约大量投资，更有利于环境保护，因此被人们称之为“绿色”施工技术。

Using traditional road maintenance methods, the amount of asphalt pavement waste is enormous, causing pollution to the environment. The extraction of a large amount of new materials can also lead to resource depletion and environmental damage, and the amount of exhaust gas and energy consumption is also enormous. The use of cold regeneration technology can completely avoid the above-mentioned problems. It not only saves a lot of investment, but also benefits environmental protection, so it is called "green" construction technology.