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: inorganic regenerants and asphalt regenerants. When asphalt is regenerated, a small amount of cement is often added to improve its water damage resistance. The commonly used inorganic regenerant is cement, and others include lime fly ash, cement fly ash, etc. Inorganic stable cold regeneration is generally formed and cured according to traditional semi-rigid materials. Carry out heavy compaction test or vibration compaction test at room temperature, and keep in good condition at 20 ℃ or 25 ℃ for 7 days. The 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. The Marshall method is a common method to determine the cold cracking strength or the dry cracking strength of recycled asphalt.

再生剂选择

Regenerant selection

美国针对全国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**再生，4个全深*，7个两者都用。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。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着改*冷再生材料水稳定性，提高材料力学性能尤其是早期强度。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。

The United States issued a questionnaire survey on regenerants to 52 Local highway management agencies across the country. 46 replies, 24 frequently used, 13 places used partial * * regeneration, 4 full depth *, 7 both. 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. Composite stabilization of asphalt and cement is widely used in cold regeneration in South Africa, and the amount of cement is generally 1%. It is considered that the addition of cement can significantly improve the water stability of cold recycled materials and improve the mechanical properties of materials, especially the early strength. 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。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。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。国内对冷再生前评价尚无专门的评价方法，需要进一步研究；冷再生材料开始一般作为基层使用，目前逐步作为下面层使用；在我国冷再生施工中，水泥作为再生剂较多其实验方法已经较为统一，主要的参考传统的半刚性材料；而沥青作为再生剂的冷再生实验方法还不统一，需要进一步研究确定合理的实验方法。

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. 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. 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. There is no special evaluation method for pre cold regeneration evaluation in China, which needs further research; Cold recycled materials are generally used as the base layer at first, and are gradually used as the lower layer at present; In the cold recycling construction in China, cement is more used as a recycling agent, and its experimental method has been relatively unified, mainly referring to the traditional semi-rigid materials; However, the experimental method of cold regeneration of asphalt as regeneration agent is not unified, and further research is needed to determine a reasonable experimental method.

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