沥青路面就地冷再生工艺是20世纪80年代后期在路面铣刨工艺的基础上发展起来的一种新技术，目前已成为国际上道路维修改造的主要方法之一。这种技术包括四个主要工序：1、准备旧路面的再生材料，包括破碎和翻修旧路；2、加入稳定剂和水并加以拌合；3、成型和压实；4、在再生形成的路面基层上加铺磨耗层或路面面层。

　　The in-situ cold recycling process of asphalt pavement is a new technology developed in the late 1980s based on the pavement milling process, and has now become one of the main methods for road maintenance and renovation internationally. This technology includes four main processes: 1. Preparing recycled materials for old road surfaces, including crushing and renovating old roads; 2. Add stabilizer and water and mix them together; 3. Forming and compaction; 4. Add a wear layer or pavement surface layer on the regenerated pavement base.

　　为了加强补强作用，有时还要加铺粘结层和部分路面结构层。就地冷再生工艺主要用于路面结构层（基层）的翻修，适用于各种类型的道路。

　　In order to strengthen the reinforcement effect, it is sometimes necessary to add a bonding layer and some pavement structural layers. The in-situ cold recycling process is mainly used for the renovation of pavement structural layers (base layers) and is suitable for various types of roads.

　　与传统的施工方法相比，就地冷再生具有诸多的优点 ：

　　Compared with traditional construction methods, on-site cold recycling has many advantages:

　　① 工序简单。由于原有旧路面的材料全部被就地利用，省略了挖掘、外运、厂内加工及回填等一系列工作，使得施工工序简化。

　　① The process is simple. Due to all the materials of the original old road surface being utilized on-site, a series of work such as excavation, transportation, factory processing, and backfilling have been omitted, simplifying the construction process.

　　② 可以不中断交通。由于就地冷再生工序简单，投入现场的施工设施很少，对交通干扰反应不敏感，故此在交通量不太大的情况下，可以半幅通车，半幅施工。

　　② Traffic can be uninterrupted. Due to the simple on-site cold recycling process and limited construction facilities, it is not sensitive to traffic interference. Therefore, in situations where traffic volume is not too high, it is possible to have half width traffic and half width construction.

　　③ 不损坏路基。与采用传统施工机械修复道路相比，冷再生施工很少损坏路基。因为维特根冷再生机的高附着力轮胎在暴露的路基上只通过一次。而采用传统的机械施工时，路基将承受频繁的高应力载荷，往往导致“局部隆起”现象，必要时需要采用挖掘机和回填作业进行处理。

　　③ Do not damage the roadbed. Compared with using traditional construction machinery to repair roads, cold recycling construction rarely damages the roadbed. Because the high adhesion tires of the Wittgen cold recycling machine only pass through once on exposed roadbeds. When traditional mechanical construction is used, the roadbed will be subjected to frequent high stress loads, often resulting in "local uplift" phenomenon. If necessary, excavators and backfilling operations need to be used for treatment.

　　④ 提高道路等级。由于该方法强化了基础的承载能力，从根本上保证了道路等级的提高，这一优点对于低等级道路的改造尤为重要。

　　④ Raise the road grade. Due to the strengthened carrying capacity of the foundation, this method fundamentally ensures the improvement of road grades, which is particularly important for the renovation of low-grade roads.

　　⑤ 成本较低。与传统的施工方法相比，由于旧的道路材料得以全部利用，随着再生层厚度的不同，大致可以降低成本10％～20％。厚度越深，降低成本越多，这也是被实践所证实的。

　　⑤ Low cost. Compared with traditional construction methods, due to the full utilization of old road materials, the cost can be reduced by approximately 10% to 20% depending on the thickness of the recycled layer. The deeper the thickness, the greater the cost reduction, which has also been proven by practice.

　　⑥ 生产效率高。就地冷再生是在自然条件下进行的，除了个别严重的坑槽需要简单的预处理外，其余路面均不需要任何处理。再加之一次性通过的施工特点，充分地利用了作业时间，因此大大地提高了生产效率，经过我们的实地测定，一台维特根再生机，在组织合理的情况下，每天可以再生路面5000m2以上。

　　⑥ High production efficiency. On site cold regeneration is carried out under natural conditions, and except for a few severe potholes that require simple pre-treatment, the rest of the road surface does not require any treatment. In addition, the one-time pass construction feature fully utilizes the working time, thus greatly improving production efficiency. After our on-site testing, a Wirtgen recycling machine, with reasonable organization, can regenerate more than 5000m2 of road surface per day.

　　⑦ 保护环境和资源。因为旧料得以全部就地利用，减少了新材料的开采，也不存在旧料运输和废料随意弃放的问题，施工过程没有粉尘和废气的污染，节约了资源，保护了环境，因此被人们称之为绿色施工技术。就地冷再生技术施工工艺：沥青路面就地冷再生，并不是人们通常所理解的将已经破损的沥青路面重新恢复到完好的原始状态，而是将旧面层和部分基层就地改建成新的基层（或底基层）。严格地讲，此工艺应该称之为旧沥青路面材料的就地再利用。

　　⑦ Protecting the environment and resources. Because all old materials can be utilized on-site, reducing the mining of new materials, and there is no problem of transporting old materials or disposing of waste materials at will, the construction process is free from dust and exhaust pollution, saving resources and protecting the environment. Therefore, it is called green construction technology by people. On site cold recycling technology construction process: On site cold recycling of asphalt pavement is not the usual understanding of restoring the damaged asphalt pavement to its original state, but rather rebuilding the old surface layer and some base layers into new base layers (or sub base layers) on site. Strictly speaking, this process should be referred to as the in-situ reuse of old asphalt pavement materials.

　　道路就地冷再生技术的工作原理，是在原有旧路铺层的基础上，按照新的设计要求，掺入适量的骨料、水泥、石灰、粉煤灰、乳化沥青、泡沫沥青和水等外加材料，利用就地冷再生设备，在自然常温下，就地连续完成对旧铺层（路面和部分基层）的铣刨、破碎、添加料、拌和、摊铺等工序，随后进行找平和碾压，最终修建出一种特殊级配的道路基层（或底基层）。

　　The working principle of the cold in place recycling technology of roads is that on the basis of the original old pavement layer, according to the new design requirements, appropriate amount of aggregate, cement, lime, fly ash, emulsified asphalt, foam asphalt, water and other external materials are added, and the cold in place recycling equipment is used to continuously complete the milling, crushing, adding materials, mixing, paving and other processes of the old pavement layer (pavement and part of the base) at natural ambient temperature, followed by leveling and rolling, and finally build a special graded road base (or subbase).

　　道路就地冷再生技术的主要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。铣刨转子将水与铣刨料充分拌和，并达到需要的最佳含水量，从而达到混合料的最大压实度。液体稳定剂，例如热沥青（冷再生机自带泡沫沥青发泡装置，可将热沥青加热到160～180℃与少量水混合发泡）可通过专门设计的喷洒嘴将泡沫沥青喷洒到拌和腔；粉状稳定剂，如水泥，需按设计添加量事先洒布在再生机前的路面上，再生机将粉状稳定剂与再生料和水一次性拌和。如遇再生层原级配不良的情况，可在再生前将所缺少的部分集料洒布在路面上，通过与旧料拌和来改善原路面材料的级配。

　　The main equipment for on-site cold recycling technology on roads is a cold recycling machine that integrates crushing and mixing. The core of the 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 with the milling material to achieve the desired optimal moisture content, thereby achieving the maximum compaction degree of the mixture. Liquid stabilizers, such as hot asphalt (the cold recycling machine has its own foam asphalt foaming device, which can heat the hot asphalt to 160~180 ℃ and mix it with a small amount of water for foaming), can spray foam asphalt to the mixing chamber through specially designed spray nozzles; Powdered stabilizers, such as cement, need to be sprayed on the road surface in front of the recycling machine according to the designed addition amount. The recycling machine mixes the powdered stabilizer with the recycled material and water at once. In case of poor grading of the recycled layer, the missing aggregate can be sprinkled on the road surface before regeneration, and the grading of the original road material can be improved by mixing it with the old material.

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