On site cold regeneration of roads belongs to the category of road maintenance and renovation, which mainly solves the problem of damage to the base layer of asphalt pavement. Specifically, road cold recycling refers to making full use of the old paving materials (surface course and base course) of existing asphalt roads, adding some new aggregates when necessary, and adding a certain amount of additives (cement, foam asphalt, emulsified asphalt, lime, fly ash, etc.) in proportion to continuously complete the milling, crushing, mixing, paving and compaction of materials in situ at natural ambient temperature, The process of constructing a new base with the required performance and quality.

就地冷再生技术不仅适用于高等级公路的维修与改造，也适用于一般道路及乡间公路的维修与改造。此技术在欧美等已得到了较为普遍的应用，并常常作为路面维修的方案，随我国98年引进台就地冷再生机后，近几年来，就地冷再生技术在我国受到了业内人士普遍的关注与认同，推广普及速度很快

The on-site cold regeneration technology is not only suitable for the maintenance and re
novation of high-grade highways, but also for the maintenance and renovation of general roads and rural roads. This technology has been widely used in countries such as Europe and America, and is often the preferred solution for road maintenance. With the introduction of the first on-site cold regeneration machine in China in 1998, in recent years, the on-site cold regeneration technology has received widespread attention and recognition from industry insiders in China, and its promotion and popularization speed is fast

就地冷再生技术的主要施工机具为集破碎与拌和为一体的冷再生机，我公司现有世界范围内的德国维特根WR2500S冷再生机两台套，相配套维特根W2000铣刨机一台套，实力，走规模化施工之路。

The main construction equipment for on-site cold recycling technology is a cold recycling machine that integrates crushing and mixing. Our company currently has two sets of the most advanced German Wittgen WR2500S cold recycling machines worldwide, and one set of Wittgen W2000 milling and planing machine to match. Our strength is strong and we are taking the path of large-scale construction.

根据添加剂的不同，可以把冷再生分为水泥冷再生、泡沫沥青冷再生、乳化沥青冷再生、石灰冷再生、粉煤灰冷再生等。目前国内应用广泛的还是水泥冷再生，下边就以水泥冷再生为例简单介绍一下冷再生的工作原理。

According to different additives, cold recycling can be divided into cement cold recycling, foam asphalt cold recycling, emulsified asphalt cold recycling, lime cold recycling, fly ash cold recycling, etc. At present, the most widely used method in China is cement cold recycling. Taking cement cold recycling as an example, let's briefly introduce the working principle of cold recycling.

在要进行再生的路面上摊铺水泥（按试验配合比添加，一般为４％—６％）冷再生机的核心是装有大量专用刀头的铣刨和拌和转子的铣刨鼓。转子向上旋转破碎原路面材料，冷再生机向前行进时，转子转动，冷再生机通过软管与水罐车连接，微处理器精确控制水在拌和仓中的喷洒量。输送的水通过铣刨转子将水与铣刨料充分拌和，并达到需要的佳含水量，从而保证混和料的大压实度。

The core of a cold recycling machine is a milling drum equipped with a large number of specialized cutting heads and mixing rotors, which is used to pave cement on the road surface to be recycled (added according to the experimental mix ratio, usually 4-6%). The rotor rotates upwards to crush the raw road surface material. When the cold regeneration machine moves forward, the rotor rotates. The cold regeneration machine is connected to the water tank truck through a hose, and the microprocessor accurately controls the amount of water sprayed in the mixing bin. The conveyed water is thoroughly mixed with the milling material through the milling rotor to achieve the desired optimal moisture content, thereby ensuring the maximum compaction of the mixed material.

液体稳定剂，例如热沥青（WR2500S冷再机自带泡沫沥青发泡装置，可将热沥青加热到160—180℃与少量水混和发泡）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撒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。

Liquid stabilizers, such as hot asphalt (the WR2500S refrigerator 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; Powder stabilizers, such as cement, need to be pre distributed on the road surface in front of the recycling machine according to the designed dosage. The recycling machine will mix the powder stabilizers with recycled materials and water in one go.

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撒布在路面上，通过与旧料拌和来改善原路面材料的级配。

If the original gradation of the recycled layer is poor, the missing part of the aggregate can be spread on the road surface before regeneration, and the gradation of the original road material can be improved by mixing with the old material.