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.

再生劑選擇

Regenerant selection

美國針對全國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**再生，4個全深*，7個兩者都用。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。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*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(qiáng)度。由于我國對使用半剛性基層經(jīng)驗(yàn)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(shí)候，實(shí)驗(yàn)方法也主要參考半剛性材料實(shí)驗(yàn)。

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。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。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(diǎn)。國內(nèi)對冷再生前評價(jià)尚無專門的評價(jià)方法，需要進(jìn)一步研究；冷再生材料開始一般作為基層使用，目前逐步作為下面層使用；在我國冷再生施工中，水泥作為再生劑較多其實(shí)驗(yàn)方法已經(jīng)較為統(tǒng)一，主要的參考傳統(tǒng)的半剛性材料；而瀝青作為再生劑的冷再生實(shí)驗(yàn)方法還不統(tǒng)一，需要進(jìn)一步研究確定合理的實(shí)驗(yàn)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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