沥青老路面在养护工程中，常用的方法有冷再生和热再生。今天我们介绍一下就地冷再生的相关特点和工艺要求。

　　The most commonly used methods for maintaining asphalt pavement in maintenance projects are cold regeneration and hot regeneration. Today we will introduce the relevant characteristics and process requirements of on-site cold regeneration.

　　1、沥青就地冷再生技术的基本原理

　　1. Basic principles of in-situ cold recycling technology for asphalt

　　就地冷再生技术是利用专用再生机械在现场将原有路面结构铣刨、破碎，根据需要添加新料，在常温下与稳定剂（水泥、泡沫沥青或乳化沥青等）拌和，压实成型后，成为路面一个结构层次的整套工艺。

　　Cold in place recycling technology is a complete process of milling and crushing the original pavement structure on the site by using special recycling machinery, adding new materials as required, mixing with stabilizers (cement, foam asphalt or emulsified asphalt, etc.) at normal temperature, compacting and forming, and becoming a structural layer of the pavement.

　　图片

　　picture

　　沥青就地再生由专用再生机械实现，其核心是1个装有若干个硬质合金刀具的切削转子。转子向上旋转铣刨原路面材料的同时，可以通过专门设计的沥青喷洒嘴和水喷洒嘴，将泡沫沥青（或乳化沥青）和水喷洒到拌和腔，如下图所示。

　　Asphalt on-site regeneration is achieved by specialized regeneration machinery, with the core being a cutting rotor equipped with several hard alloy cutting tools. While the rotor is rotating upward to mill the raw pavement materials, foam asphalt (or emulsified asphalt) and water can be sprayed into the mixing chamber through specially designed asphalt spray nozzles and water spray nozzles, as shown in the following figure.

　　图片

　　picture

　　水泥可事先撒布在再生机前的路面上。再生机将泡沫沥青（或乳化沥青）、水泥、旧路面材料和水一次性拌和。微型计算机根据再生的宽度、工作深度、工作速度及材料的密度控制沥青喷洒量和拌和水量。

　　Cement can be pre spread on the road surface in front of the recycling machine. The recycling machine mixes foam asphalt (or emulsified asphalt), cement, old pavement materials and water at one time. The microcomputer controls the asphalt spraying and mixing water volume based on the width, working depth, working speed, and material density of the regeneration.

　　2、沥青层就地冷再生技术的特点

　　2. Characteristics of in-situ cold recycling technology for asphalt layer

　　泡沫沥青（或乳化沥青）就地冷再生技术适合路面的功能性和结构性维修，对于沥青面层或基层损坏的路面进行破碎和重新稳定，产生一个新的、具有一定强度的、柔性的、较厚的均匀路面结构层，

　　The foam asphalt (or emulsified asphalt) cold in place recycling technology is suitable for the functional and structural maintenance of the pavement. It can crush and re stabilize the damaged pavement of the asphalt surface course or base course to produce a new, flexible, thick and uniform pavement structure layer with certain strength,

　　能够提高路面结构承载能力、抗疲劳和抗水损害的能力，而且可以有效的抑制水稳基层材料干缩和温缩变形引起的反射裂缝问题，从而延长路面的使用寿命。

　　It can improve the bearing capacity, fatigue resistance, and water damage resistance of the pavement structure, and effectively suppress the reflection crack problem caused by the dry shrinkage and thermal shrinkage deformation of the water stable base material, thereby extending the service life of the pavement.

　　3、沥青层就地冷再生技术的适应性

　　3. Adaptability of in-situ cold recycling technology for asphalt layer

　　泡沫沥青就地冷再生技术主要用于旧沥青路面材料的再生利用，适用于各等级公路沥青路面的大修、改扩建工程，再生层可作为高速公路、一级公路和二级公路沥青路面的下面层及基层，三、四级公路沥青路面的上面层。

　　The cold in place recycling technology of foam asphalt is mainly used for the recycling of old asphalt pavement materials, which is applicable to the overhaul, reconstruction and expansion projects of asphalt pavement of all classes of highways. The recycled layer can be used as the lower layer and base layer of asphalt pavement of expressway, first-class highway and second-class highway, and the upper layer of asphalt pavement of Class III and fourth-class highway.

　　4、沥青层就地冷再生技术施工工艺流程

　　4. Construction process flow of in-situ cold recycling technology for asphalt layer

　　4. 1、就地冷再生施工前应进行配合比设计，具体包括：对原路面材料取样并筛→ 乳化沥青或泡沫沥青原材料的选择及检测→ 基于旧路面材料的矿料级配设计→ 测定合成矿料的含水率→ 根据马歇尔稳定度和浸水马歇尔试验结果确定沥青用量→ 对混合料通过冻融劈裂试验进行性能检测，试验结果应满足下列要求：

　　4.1. The mix design shall be carried out before the construction of on-site cold recycling, specifically including: sampling and screening of raw pavement materials → selection and testing of emulsified asphalt or foam asphalt raw materials → mineral aggregate gradation design based on old pavement materials → determination of the optimal moisture content of synthetic mineral aggregate → determination of the optimal asphalt content based on Marshall stability and immersion Marshall test results → performance testing of the mixture through freeze-thaw splitting test, and the test results shall meet the following requirements:

　　图片

　　picture

　　（1）对于以乳化沥青为粘结剂的混合料：空隙率要求9-14%；劈裂强度（15摄氏度）不小于0. 5MPa（下面层）、干湿劈裂强度比不小于75；马歇尔稳定度（40摄氏）不小于6.0 KN（下面层）、浸水马歇尔残留稳定度不小于75%；冻融劈裂强度比不小于70%。

　　(1) For mixtures using emulsified asphalt as a binder: porosity requirement of 9-14%; Splitting strength (15 degrees Celsius) shall not be less than 0 5MPa (lower layer), dry wet splitting strength ratio not less than 75; Marshall stability (40 ℃) not less than 6.0 KN (lower layer), immersion Marshall residual stability not less than 75%; The freeze-thaw splitting strength ratio shall not be less than 70%.

　　（2）对于以泡沫沥青为黏结剂的混合料：劈裂强度（15摄氏度）不小于0. 5MPa（下面层）、干湿劈裂强度比不小75；马歇尔稳定度（40摄氏度）不小于6.0KN（下面层）、浸水马歇尔残留稳定度不小于75%；冻融劈裂强度比不小于70%。

　　(2) For the mixture with foam asphalt as binder: the splitting strength (15 ℃) shall not be less than 0 5MPa (lower layer), with a dry wet splitting strength ratio of not less than 75; Marshall stability (40 degrees Celsius) not less than 6.0KN (lower layer), immersion Marshall residual stability not less than 75%; The freeze-thaw splitting strength ratio shall not be less than 70%.

　　4.2、就地冷再生工艺流程

　　4.2 On site cold regeneration process flow

　　就地冷再生工艺流程包括：封闭交通→ 路面杂物→ 施样放线→ 再生机再生作业 摊铺（摊铺机或平地机）→ 压实→ 养生→ 开放交通。

　　The on-site cold recycling process includes: closed traffic → removal of road debris → sampling and laying out → regeneration machine regeneration operation paving (paver or grader) → compaction → curing → open traffic.

　　5、沥青层就地冷再生路面检测项目

　　5. Asphalt layer on-site cold recycling pavement testing project

　　沥青层就地冷再生路面检测项目包括：平整度间隙、纵断面高程、厚度、宽度、横坡度、外观、压实度。

　　The on-site cold recycling pavement inspection items for asphalt layer include: maximum clearance for flatness, vertical section elevation, thickness, width, cross slope, appearance, and compaction degree.

　　6、就地冷再生工艺的适用条件及优点

　　6. Applicable conditions and advantages of in-situ cold regeneration process

　　1）水泥冷再生特点及其适用条件

　　1) Characteristics and Applicable Conditions of Cement Cold Recycling

　　①水泥冷再生基层属于半刚性基层，具有强度高，板体性好，水稳性好等特点。缺点跟传统半刚性基层类似，是结构层容易产生裂缝。

　　① Cement cold recycled base belongs to semi-rigid base, which has the characteristics of high strength, good board properties, and good water stability. The disadvantage is similar to traditional semi-rigid base layers, as the structural layer is prone to cracking.

　　②对下承层整体性和强度要求不高，通常只要不是路基病害，都能采用水泥再生。

　　② The overall integrity and strength requirements for the lower bearing layer are not high, and cement regeneration can usually be used as long as it is not a roadbed disease.

　　③造价较低，施工便捷，养生期与传统水稳碎石基层相同。

　　③ Low cost, convenient construction, and the same curing period as traditional water stable gravel base.

　　④适用条件：旧沥青路面基层为水稳材料、二灰材料；路基病害提前挖补换填；旧路沥青面层厚度通常不超过10cm。

　　④ Applicable conditions: The base layer of the old asphalt pavement is made of water stable material and fly ash material; Advance excavation and replacement of roadbed diseases; The thickness of the asphalt surface layer on old roads usually does not exceed 10cm.

　　2）泡沫沥青冷再生特点及其适用条件

　　2) Cold recycling characteristics of foam asphalt and its application conditions

　　①泡沫沥青冷再生结构层属于半柔性材料，抗疲劳性能好，不容易产生干缩和温缩变形，有利于半刚性基层的反射裂缝及车辙现象。缺点是结构层强度较低。

　　① The foam asphalt cold recycling structural layer is a semi flexible material with good fatigue resistance, which is not easy to produce dry shrinkage and temperature shrinkage deformation, and is conducive to eliminating reflection cracks and rutting of semi-rigid base. The disadvantage is that the strength of the structural layer is relatively low.

　　②对下承层整体性和强度要求较高，通常如果旧路面出现松散或者大面积网裂不适合用泡沫沥青冷再生工艺处理。

　　② The requirements for the integrity and strength of the lower bearing layer are high. Generally, if the old pavement is loose or has a large area of mesh cracks, it is not suitable to use the foam asphalt cold recycling process.

　　③造价较高，施工工艺较复杂，养生期短但对气候条件要求高。

　　③ The cost is high, the construction process is complex, the curing period is short, but the requirements for climate conditions are high.

　　④适用于旧沥青路面材料为各类旧沥青材料、旧水稳材料、二灰材料等。尤其适合稳定旧沥青材料。

　　④ Suitable for various types of old asphalt pavement materials, such as old asphalt materials, old water stable materials, and fly ash materials. Especially suitable for stabilizing old asphalt materials.

　　3）就地冷再生的优点

　　3) Advantages of on-site cold regeneration

　　①成本低：道路就地冷再生由于全部利用了旧的铺层材料，从而减少了道路维修或改造时旧铺层材料的挖起运输、废置和新材料的购置，节约能源，从而导致成本大幅度下降。

　　① Low cost: On site cold recycling of roads utilizes all old paving materials, reducing the excavation, transportation, disposal, and purchase of new materials during road maintenance or renovation, saving energy and leading to a significant reduction in costs.

　　据国外施工资料介绍，与在旧铺层上加铺新料的维修方法相比，就地冷再生约可降低成本20%一45%。

　　According to foreign construction data, compared with the maintenance method of adding new materials on the old layer, on-site cold recycling can reduce costs by about 20% to 45%.

　　②效率高：道路就地冷再生机械施工一次性可以完成铣刨、破碎、添加、拌和及摊铺，从而简化了施工程序，缩短施工工期。使用就地冷再生机械，每天施上可完成5000～8000m2的工作量，创造了道路改造快速施工的里程碑。

　　② High efficiency: The on-site cold recycling machinery for road construction can complete milling, crushing, adding, mixing, and paving in one go, simplifying the construction process and shortening the construction period. By using on-site cold recycling machinery, a daily workload of 5000-8000m2 can be completed, creating a milestone in the rapid construction of road renovation.

　　③质量好：就地冷再生可以根据不同道路旧铺层材料的实际情况进行设计，选择不同的添 加剂，配比准确，可以保证再生材料的品质和施上质量，形成施工成型厚而均匀的粘结层，从而保证了维修后道路的使用期限，使再生后的沥青路面与新铺沥青路面性能基本相当。

　　③ Good quality: On site cold recycling can be designed according to the actual situation of different road old pavement materials, selecting different additives and accurately proportioning them to ensure the excellent quality and application quality of recycled materials, forming a thick and uniform bonding layer during construction, thus ensuring the service life of the repaired road and making the performance of the recycled asphalt pavement basically equivalent to that of the newly laid asphalt pavement.

　　同时由于对旧材料进行重复利用，施土过程中路面的几何线形及厚度能得到很好地保持。

　　At the same time, due to the reuse of old materials, the geometric shape and thickness of the road surface can be well maintained during the soil application process.

　　④污染少：使用传统的道路维修方法，沥青路面废弃量十分巨大，对环境造成大量污染；新材料的开采，也会造成资源减少和环境的破坏。采用冷再生技术则可完全避免上述问题。

　　④ Less pollution: Using traditional road maintenance methods, the amount of asphalt pavement waste is very large, causing a lot of pollution to the environment; The mining of new materials can also cause resource depletion and environmental damage. The use of cold regeneration technology can completely avoid the above-mentioned problems.

　　由于旧料得以充分再生利用，从而大大减少了新筑路材料的开采量；也不存在旧料的运输与存放问题，是一项绿色技术。它不仅可以节约大量投资，更有利于环境保护，因此被人们称之为“绿色”施工技术。

　　As the old materials can be fully recycled, the mining output of new road building materials is greatly reduced; There is no problem with the transportation and storage of old materials, and it is a green and environmentally friendly technology. It not only saves a lot of investment, but also benefits environmental protection, so it is called "green" construction technology

　　⑤干扰低：冷再生施工的特点是大型机械，密集施上，将因施土而造成的交通干扰降到了。该机械具有封闭式自动控制添加系统，可以防止粉尘飞扬，有利于文明施工。

　　⑤ Low interference: The characteristic of cold recycling construction is the use of large machinery and dense construction, which minimizes traffic interference caused by soil application. This machine has a closed automatic control addition system, which can prevent dust from flying and is conducive to civilized construction.

　　不像新建道路施工项目那样，许多施工可在整个工地同时进行，冷再生施工只是集中在特定的区域。

　　Unlike new road construction projects, where many constructions can be carried out simultaneously on the entire construction site, cold recycling construction is only concentrated in specific areas.

　　整个冷再生机械组合可以处于同一条车道内，不影响另一条车道车辆通行，可进行开放式施工，特别适用于交通量较大或道路较窄情况下的施工。

　　The entire cold recycling machinery assembly can be located in the same lane without affecting the passage of vehicles in another lane, and can be constructed in an open manner, especially suitable for construction in situations with high traffic volume or narrow roads.

　　本文由 冷再生机租赁 友情奉献.更多有关的知识请点击  http://www.tclqgc.com/   真诚的态度.为您提供为的服务.更多有关的知识我们将会陆续向大家奉献.敬请期待.

　　This article is a friendly contribution from Cold Recycling Machine Rental For more related knowledge, please click http://www.tclqgc.com/ Sincere attitude To provide you with comprehensive services We will gradually contribute more relevant knowledge to everyone Coming soon.