國內(nèi)研究中常見的路面級配：水泥冷再生材料一般選用《公路路面基層施工技術(shù)規(guī)范》中的級配范圍；瀝青（+水泥）穩(wěn)定類材料篇采用路面設(shè)計規(guī)范中的AC13或AC20級配范圍，也有采用再生規(guī)范中的級配范圍。

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.

其他曾經(jīng)使用的級配有：維特根手冊中的級配范圍、ARRA法中的級配范圍、貝雷法控制級配，也有研究者自行設(shè)計級配。

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

冷再生材料的性質(zhì)與傳統(tǒng)道路材料不完全相同，因而對成形的要求也不完全相同。冷再生材料按再生劑大致可以區(qū)分為兩類：

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:

無機(jī)再生劑和瀝青再生劑，瀝青再生時往往加入少量水泥以提高其抗水損壞能力。常用的無機(jī)再生劑是水泥，其他還有二灰、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.

無機(jī)穩(wěn)定冷再生一般按照傳統(tǒng)的半剛性材料進(jìn)行成形和養(yǎng)生。常溫下進(jìn)行重型擊實試驗或者振動擊實試驗，在20℃或者25℃下養(yǎng)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.

通過含水量-強度關(guān)系確定佳含水量。瀝青穩(wěn)定劑冷再生時的情況比較復(fù)雜，尚無統(tǒng)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.

冷再生材料組成設(shè)計方法常見的方法是用擊實法確定佳液體量，用馬歇爾穩(wěn)定度、干劈裂強度、濕劈裂強度中的一個或幾個達(dá)到優(yōu)來確定瀝青用量。

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.

再生劑選擇

Regenerant selection

針對52個地方公路管理機(jī)構(gòu)發(fā)出關(guān)于再生劑的問卷調(diào)查。46個回復(fù)，24個經(jīng)常使用，13處地方使用部分深度再生，4個全深度，7個兩者都用。

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個地方用乳化瀝青，大部分采用高流動乳化瀝青。部分使用中凝或慢凝瀝青。石灰、粉煤灰、水泥分別在8/4/3個地方使用。

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瀝青和水泥復(fù)合穩(wěn)定，水泥用量一般選1%。認(rèn)為水泥的加入可顯著改善冷再生材料水穩(wěn)定性，提高材料力學(xué)性能尤其是早期強度。

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.

由于我國對使用半剛性基層經(jīng)驗豐富，且很多再生路段是把再生材料作為基層使用，所以用水泥進(jìn)行穩(wěn)定較為常見，且用水泥進(jìn)行穩(wěn)定的時候，實驗方法也主要參考半剛性材料實驗。

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.

冷再生路面結(jié)構(gòu)

Cold recycled pavement structure

國外的冷再生基本結(jié)構(gòu)是：熱拌瀝青混合料層+冷再生層+舊有基層。舊有基層一般是砂礫基層。

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.

目前國內(nèi)的冷再生道路其中使用較多的結(jié)構(gòu)有熱拌瀝青混合料層+再生層+半剛性層和熱拌瀝青混合料層+再生層。

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.

隨著我國大量的路面進(jìn)入維修期，路面冷再生技術(shù)會得到更廣泛的使用。文章總結(jié)了國內(nèi)外再生的技術(shù)要點。

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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