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。

In situ cold regeneration of asphalt pavement is not commonly understood as restoring damaged asphalt pavement to its original state, but rather reconstructing the old surface layer and some base layers into new base layers (or sub bases) 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，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。

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 and plane the raw road material. When the cold regeneration machine moves forward, the rotor rotates, and at the same time, water is transported from the water truck connected to the regeneration machine through a hose and sprayed in the mixing bin of the regeneration machine. The water delivery rate is precisely controlled by a microprocessor controlled pumping system.

铣刨转子将水与铣刨料充分拌和，并达到需要的含水量，从而达到混合料的压实度。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 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 sprinkled on the road surface in front of the regeneration machine according to the designed dosage. The regeneration machine will mix the powdered stabilizers with recycled materials and water in one go. If the original gradation of the recycled layer is poor, the missing part of the aggregate can be sprinkled on the road surface before regeneration, and the gradation of the original road surface material can be improved by mixing with the old material.

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