国内研究中常见的路面级配：水泥冷再生材料一般选用《公路路面基层施工技术规范》中的级配范围；沥青（+水泥）稳定类材料篇采用路面设计规范中的AC13或AC20级配范围，也有采用再生规范中的级配范围。

Pavement gradation commonly used in domestic research: Cement cold recycled materials generally use the gradation range in the technical code for construction of highway pavement base; For asphalt (+ cement) stabilized materials, the grading range of AC13 or ac20 in the pavement design specification or the grading range in the recycling specification is adopted.

其他曾经使用的级配有：维特根手册中的级配范围、ARRA法中的级配范围、贝雷法控制级配，也有研究者自行设计级配。

Other gradations that have been used include: the gradation range in wittgen manual, the gradation range in arra method, the gradation controlled by Beret method, and some researchers design the gradation by themselves.

冷再生材料成形

Cold recycled material forming

冷再生材料的性质与传统道路材料不完全相同，因而对成形的要求也不完全相同。冷再生材料按再生剂大致可以区分为两类：

The properties of cold recycled materials are different from those of traditional road materials, so the requirements for forming are also different. Cold recycled materials can be roughly divided into two categories according to regenerants:

无机再生剂和沥青再生剂，沥青再生时往往加入少量水泥以提高其抗水损坏能力。常用的无机再生剂是水泥，其他还有二灰、水泥粉煤灰等。

Inorganic regenerant and asphalt regenerant. When asphalt is regenerated, a small amount of cement is often added to improve its water damage resistance. The most commonly used inorganic regenerant is cement, and others include lime fly ash, cement fly ash, etc.

无机稳定冷再生一般按照传统的半刚性材料进行成形和养生。常温下进行重型击实试验或者振动击实试验，在20℃或者25℃下养生7天。

Inorganic stable cold regeneration is generally formed and cured according to traditional semi-rigid materials. Heavy compaction test or vibration compaction test shall be carried out at room temperature and cured at 20 ℃ or 25 ℃ for 7 days.

通过含水量-强度关系确定佳含水量。沥青稳定剂冷再生时的情况比较复杂，尚无统一方法。

The optimum water content is determined by the water content strength relationship. The situation of cold regeneration of asphalt stabilizer is complex, and there is no unified method.

冷再生材料组成设计方法常见的方法是用击实法确定佳液体量，用马歇尔稳定度、干劈裂强度、湿劈裂强度中的一个或几个达到优来确定沥青用量。

The most common method for the composition design method of cold recycled materials is to determine the optimal liquid volume by compaction method, and determine the asphalt dosage by optimizing one or more of Marshall stability, dry splitting strength and wet splitting strength.

再生剂选择

Regenerant selection

针对52个地方公路管理机构发出关于再生剂的问卷调查。46个回复，24个经常使用，13处地方使用部分深度再生，4个全深度，7个两者都用。

A questionnaire survey on regenerants was issued to 52 Local highway management institutions in China. 46 replies, 24 frequently used, 13 places used partial depth regeneration, 4 full depth, 7 both.

24个地方用乳化沥青，大部分采用高流动乳化沥青。部分使用中凝或慢凝沥青。石灰、粉煤灰、水泥分别在8/4/3个地方使用。

Emulsified asphalt is used in 24 places, and most of them use high flow emulsified asphalt. Medium setting or slow setting asphalt is partially used. Lime, fly ash and cement are used in 8 / 4 / 3 places respectively.

南非在冷再生中普遍使用沥青和水泥复合稳定，水泥用量一般选1%。认为水泥的加入可显著改善冷再生材料水稳定性，提高材料力学性能尤其是早期强度。

Asphalt and cement composite stabilization are widely used in cold regeneration in South Africa, and the cement dosage is generally 1%. It is considered that the addition of cement can significantly improve the water stability and mechanical properties of cold recycled materials, especially the early strength.

由于我国对使用半刚性基层经验丰富，且很多再生路段是把再生材料作为基层使用，所以用水泥进行稳定较为常见，且用水泥进行稳定的时候，实验方法也主要参考半刚性材料实验。

Because China has rich experience in using semi-rigid base course, and many recycled sections use recycled materials as base course, it is common to stabilize with cement, and when stabilizing with cement, the experimental method mainly refers to the semi-rigid material experiment.

冷再生路面结构

Cold recycled pavement structure

国外的冷再生基本结构是：热拌沥青混合料层+冷再生层+旧有基层。旧有基层一般是砂砾基层。

The basic structure of cold recycling abroad is: hot mix asphalt mixture layer + cold recycling layer + old base. The old base course is generally gravel base course.

目前国内的冷再生道路其中使用较多的结构有热拌沥青混合料层+再生层+半刚性层和热拌沥青混合料层+再生层。

At present, the most commonly used structures of domestic cold recycled roads are hot mix asphalt mixture layer + recycled layer + semi-rigid layer and hot mix asphalt mixture layer + recycled layer.

随着我国大量的路面进入维修期，路面冷再生技术会得到更广泛的使用。文章总结了国内外再生的技术要点。

With a large number of pavements entering the maintenance period in China, pavement cold recycling technology will be more widely used. This paper summarizes the technical points of regeneration at home and abroad.

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