就地冷再生(CIR)是一种路面修复工艺，其中将破损沥青路面碾压规定深度，将回收沥青路面(RAP)粉碎并与稳定剂(乳化沥青或泡沫沥青)混合，然后将产生的再生材料铺筑在路面上并压实。

　　Cold in place recycling (CIR) is a pavement repair process, in which the damaged asphalt pavement is rolled to the specified depth, the recycled asphalt pavement (RAP) is crushed and mixed with the stabilizer (emulsified asphalt or foam asphalt), and then the generated recycled materials are paved on the pavement and compacted.

　　一列CIR设备通常由一辆水罐车、一辆沥青罐车、一台再生设备、一台摊铺机和压路机组成。旧路面基本上是在不离开原位的情况下重新铺设的。这种工艺减少了将旧材料移除并将新的铺路材料运送到工作现场的施工交通量。

　　A CIR equipment usually consists of a water tanker, an asphalt tanker, a recycling equipment, a paver, and a roller. The old road surface is basically re paved without leaving its original position. This process reduces the construction traffic required to remove old materials and transport new paving materials to the work site.

　　在整个过程中，材料不会受热——这是与传统工艺相比的另一个优势。完工后，CIR通常覆盖有一层或多层沥青混合料。在低交通量应用中，碎石封层(chip seal )或开普密封(?cape seal)通常用作终表面层。CIR工艺是一项成熟的技术，用于所有类型的路面，包括农村公路、城市街道甚高交通量的州际公路。

　　Throughout the entire process, the material will not be heated - this is another environmental advantage compared to traditional craftsmanship. After completion, CIR is usually covered with one or more layers of asphalt mixture. In low traffic applications, chip seals or cape seals are typically used as the final surface layer. CIR technology is a mature technique used for all types of road surfaces, including rural roads, urban streets, and even high traffic interstate highways.

　　自2016年以来，John Senger一直是伊利诺伊州交通部(IDOT)的路面技术工程师。在Senger的众多职责中，他为地区和办公室的工程师提供路面设计、修复和维护策略支持，并审查和更新路面相关规范，包括与CIR相关的规范。

　　John Senger has been a pavement technology engineer at the Illinois Department of Transportation (IDOT) since 2016. Among Senger's numerous responsibilities, he provides pavement design, repair, and maintenance strategy support to engineers in regional and central offices, and reviews and updates pavement related specifications, including those related to CIR.

　　十多年来，伊利诺伊州的地方机构项目中有大量的CIR项目，还有一些用于技术评估的IDOT实验项目。从2019年开始，更多的CIR项目出现在他们的修复战略中。为什么像IDOT这样的机构在他们的修复项目中指定CIR？Senger回答说:“IDOT的道路网由大约85%的复合路面组成，其中大部分包含许多加铺层。该部门在当前的路面结构上投入了大量资源，CIR提供了一种经济有效的方法使道路上现有的HMA重生。CIR还为“重建”低ADT(平均日交通量)道路提供了一个很好的选择，这些道路由于资金限制将永远无法重建。这种处理方法既又经济，恢复交通的速度也相对较快。”

　　For over a decade, there have been numerous CIR projects in local institutional projects in Illinois, as well as some IDOT experimental projects used for technology evaluation. Starting from 2019, more CIR projects have appeared in their repair strategies. Why do organizations like IDOT specify CIR in their repair projects? Senger replied, 'IDOT's road network consists of approximately 85% composite pavement, with most of it containing many overlay layers.'. The department has invested a significant amount of resources in the current pavement structure, and CIR provides an economically effective method to revive the existing HMA on the road. CIR also provides a great option for "rebuilding" low ADT (average daily traffic volume) roads, which will never be able to be rebuilt due to financial constraints. This treatment method is both environmentally friendly and economical, and the speed of restoring traffic is relatively fast. ”

　　伊利诺伊州(Illinois State)邓拉普(Dunlap)附近的伊利诺伊州91号公路就是Senger描述的这些项目之一。该项目指定了4英寸(10.16cm)的CIR处理，然后是大约4英里(6.44km)的1.5英寸(3.81cm)的HMA表面。CIR通常用于有破损的路面，包括但不限于松散、坑洼、纵向和横向热裂缝以及边缘开裂。

　　The Illinois Route 91 near Dunlap is one of the projects described by Senger. The project specifies a 4-inch (10.16cm) CIR treatment followed by a 1.5-inch (3.81cm) HMA surface of approximately 4 miles (6.44km). CIR is commonly used for damaged road surfaces, including but not limited to loose, potholes, longitudinal and transverse hot cracks, and edge cracks.

　　上图显示了与未处理的现有车道相邻的CIR层的施工。所有开裂、破损的路面都被粉碎，与沥青乳液混合，通过摊铺机摊铺，并压实规定的密度以满足性能要求。施工后不久，交通就可以在CIR再生层上行驶了。当CIR路面挥发水分并达到终固化，从而允许HMA路面施工完成修复过程时，该路面便可承载交通。和许多新技术一样，设计师和检查员都很想知道“CIR路面的表现如何？”IDOT的个CIR项目建于2010年，包括美国24号公路3.8英里(6.12km)路段上的3.5英寸(8.89cm)CIR处理。原来的路面状况很差。该路段的IRI测量值平均为273英寸/英里。IRI代表国际平整度指数，这是一种衡量路面平整度的指标，新铺设项目的典型值在2550英寸/英里之间。数值在125200英寸/英里范围内的路面是修复的候选路面。

　　The above figure shows the construction of the CIR layer adjacent to the untreated existing lane. All cracked and damaged pavements are crushed, mixed with asphalt lotion, paved by pavers, and compacted to the specified density to meet performance requirements. Shortly after construction, traffic will be able to travel on the CIR regeneration layer. When the CIR pavement evaporates moisture and reaches final solidification, allowing the HMA pavement construction to complete the repair process, the pavement can carry traffic. Like many new technologies, designers and inspectors are curious about the performance of CIR pavement? ”The first CIR project of IDOT was built in 2010, including a 3.5-inch (8.89cm) CIR treatment on a 3.8-mile (6.12km) section of US Route 24. The original road condition was very poor. The average IRI measurement value for this section is 273 inches per mile. IRI stands for International Roughness Index, which is an indicator of road surface smoothness. The typical value for new pavement projects is between 25 and 50 inches per mile. Road surfaces with values ranging from 125 to 200 inches per mile are candidate for repair.

　　Senger和他的团队一直在跟踪这个个CIR项目的表现，并在近的2021年俄亥俄州运输和工程会议上分享了数据。上图显示了CIR项目与全州综合项目相比的路面状况等级。IDOT采用路面状况评级系统，9.0为状况，1.0为差状况。这个CIR项目在十年后保持了低于7的路面状况等级。这优于典型的复合路面(PCC路面上的HMA加铺层)，后者在使用10年后通常得分在5到6分之间。目前，路面的平整度测量值为70英寸/英里。并且显示出一些低严重程度的开裂。

　　Senger and his team have been tracking the performance of this first CIR project and shared data at the recent 2021 Ohio Transportation and Engineering Conference. The above figure shows the road condition level of the CIR project compared to the statewide comprehensive project. IDOT adopts a road condition rating system, with 9.0 being the best condition and 1.0 being the worst condition. This CIR project maintained a road condition level below 7 after ten years. This is superior to typical composite pavements (HMA overlay on PCC pavement), which typically score between 5 and 6 points after 10 years of use. At present, the measured roughness of the road surface is 70 inches per mile. And it shows some low severity cracking.

　　当涉及到确定使路面修复和材料更可持续的方法时，CIR可能是解决方案的一部分。组织正在探索如何推进沥青再生技术，如CIR，以积极影响沥青路面的碳足迹。各机构也不会落后太多。当被问及可持续性和材料再利用是否是选择处理方案的因素时，Senger回答说:“是的。几何形状、可施工性和排水也是一个因素。IDOT尚未开发或实施任何类型的生命周期分析(LCA)流程，但我们一直在寻找有助于保护环境的方法。”

　　When it comes to determining methods to make road surface repairs and materials more sustainable, CIR may be part of the solution. The organization is exploring how to advance asphalt recycling technologies, such as CIR, to positively impact the carbon footprint of asphalt pavements. Each institution will not fall too far behind. When asked if sustainability and material reuse are factors in choosing treatment options, Senger replied, "Yes. Geometry, constructability, and drainage are also factors. IDOT has not yet developed or implemented any type of life cycle analysis (LCA) process, but we have been searching for methods that can help protect the environment. ”

　　Senger补充说，“有，该部门可能会采用生命周期评估(LCA)流程，这将有助于管理和指导修复和重建决策。目前，分析中的可变性令我担忧。调整某些输入可以极大地影响分析结果，我们试图尽可能为所有处理和路面类型创造一个公平的竞争环境。”铺装行业和协会如何发挥作用？为沥青材料开发一个强大、准确和可靠的LCA数据库可能关重要，不仅有助于机构指定具有成本效益、性能良好的路面材料，而且有助于为净零碳排放的未来指定更可持续的选项。

　　Senger added, 'One day, the department may adopt a Life Cycle Assessment (LCA) process, which will help manage and guide repair and reconstruction decisions.'. At present, the variability in the analysis worries me. Adjusting certain inputs can greatly affect the analysis results, and we strive to create a fair competitive environment for all processing and road surface types as much as possible. ”How can the pavement industry and associations play a role? Developing a powerful, accurate, and reliable LCA database for asphalt materials may be crucial, not only for institutions to designate cost-effective and high-performance pavement materials, but also for specifying more sustainable options for a net zero carbon emissions future.

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