冷再生作为一种新兴的施工技术，在我国公路事业飞速发展的今天，将会以其独特的施工工艺、特点、牢固立足于公路施工工艺的竞争行列之中，使公路养护改建工作发生了重大变革，摒弃了传统工艺，采用先进的就地冷再生技术，为公路改扩建及日常养护工作开辟了一个新的领域。

　　Cold recycling, as an emerging construction technology, will firmly establish itself in the competitive field of highway construction technology with its unique construction techniques and characteristics in the rapid development of China's highway industry. It will bring significant changes to highway maintenance and reconstruction work, abandoning traditional techniques and adopting advanced on-site cold recycling technology, opening up a new field for highway expansion and daily maintenance work.

　　我国公路建设事业迅速发展，道路通车里程逐年增加，在大自然和行车的作用下，特别是近年来超载愈演愈烈，加速了道路的各种病害，大大缩短了维修养护的间隔时间，道路养护、改造任务也越来越重。以往传统的养护方法在旧路面破损、基层强度不足，需补强改善时，是将旧沥青路面和旧结构层全部挖除，然后再重新做基层和面层，这样不仅工程造价较高、施工工期较长、污染环境、并且需要长时间中断交通，给行使车辆和行人的通行带来极大的不便。为解决现有传统养护改建施工中存在的实际问题，国内外同行经过多年的研究实践，使公路养护改建工作发生了重大变革，摒弃了传统工艺，采用先进的就地冷再生技术，为公路改扩建及日常养护工作开辟了一个新的领域。

　　The rapid development of China's highway construction industry has led to an annual increase in the mileage of roads opened to traffic. Under the influence of nature and driving, especially in recent years, overloading has become increasingly severe, accelerating various road diseases and greatly shortening the interval between maintenance and upkeep. The tasks of road maintenance and renovation have also become increasingly heavy. The traditional maintenance method in the past, when the old road surface was damaged or the base strength was insufficient and needed to be reinforced and improved, was to excavate all the old asphalt pavement and structural layers, and then redo the base and surface layers. This not only resulted in high construction costs, long construction periods, environmental pollution, but also required a long interruption of traffic, causing great inconvenience to the passage of vehicles and pedestrians. In order to solve the practical problems existing in traditional maintenance and reconstruction construction, domestic and foreign peers have undergone significant changes in highway maintenance and reconstruction work after years of research and practice, abandoning traditional processes and adopting advanced on-site cold recycling technology, opening up a new field for highway expansion and daily maintenance work.

　　1基层现场冷再生技术原理

　　Principle of on-site cold recycling technology at the grassroots level

　　冷再生技术是采用一次性粉碎法，将路面混合料在原路面上就地铣刨、翻挖、破碎，再掺人一定数量、符合标准的再生剂、水泥、水(或加入乳化沥青)和骨料，按设定的厚度，用冷再生机进行处理后，经整形、碾压和后期养生，使其达到设计路基结构层技术要求的一种施工工艺。国外应用实践证明，基层再生技术是公路建设和养护可持续发展的重要组成部分，在我国同样具有重要的现实意义。

　　Cold recycling technology is a construction process that uses a one-time crushing method to mill, excavate, and crush the road mixture on the original road surface, and then adds a certain amount of standard rejuvenator, cement, water (or emulsified asphalt), and aggregate. After treatment with a cold recycling machine according to the set thickness, it is shaped, rolled, and later cured to meet the technical requirements of the designed roadbed structure layer. Foreign application practices have proven that grassroots regeneration technology is an important component of sustainable development in highway construction and maintenance, and also has significant practical significance in China.

　　2工程概况

　　2 Project Overview

　　老郑龙路改造工程位于衡水市，起于故城县城，止于景县龙华镇路线长13.5km。项目的路面结构中下面层采用沥青冷再生技术。路面结构为：5cmAC-16C细粒式改性沥青混凝土面层、18cm冷再生中下面层，基层直接利用旧路基层。而在施工图设计阶段，路面结构为传统工艺，即将旧沥青混合料废弃掉，重新铺筑新的路面；后来经设计变更，改为采用水泥现场冷再生技术，结构层也作了改变。

　　The Laozhenglong Road renovation project is located in Hengshui City, starting from Gucheng County and ending in Longhua Town, Jing County. The road is 13.5km long. The lower layer of the road structure of the project adopts asphalt cold recycling technology. The pavement structure consists of a 5cm AC-16C fine-grained modified asphalt concrete surface layer and an 18cm cold recycled middle and lower surface layer, with the base layer directly utilizing the old subgrade layer. In the construction drawing design stage, the pavement structure is a traditional process, which involves discarding the old asphalt mixture and paving a new pavement; Later, after design changes, the on-site cold recycling technology of cement was adopted, and the structural layer was also modified.

　　3施工准备

　　3 Construction Preparation

　　3.1旧路结构状况调查

　　3.1 Investigation of the condition of the old road structure

　　沥青混凝土旧路路面冷再生是利用旧路沥青混凝土及上基层(石灰土)经破碎加入水泥均匀拌和，在最佳含水量条件下碾压获得的半刚性结构。⑴对旧路进行弯沉检测，每车道1km检测40～50个点，详细了解旧路承载能力。⑵对旧路结构材料进行现场冷再生破碎取样，确定旧路沥青层的厚度、基层材料及基层厚度等，掌握结构强度；在实验室做级配和配合比试验，并确定不同配合比的最大干密度(重型击实)和最佳含水量，取点频率为1km取３点。⑶对旧路结构材料进行土质分析后，确定添加剂为32.5级路用普通硅酸盐水泥。

　　Cold recycling of asphalt concrete pavement on old roads is a semi-rigid structure obtained by crushing and uniformly mixing asphalt concrete and upper base layer (lime soil) with cement, and rolling them under optimal moisture content conditions. ⑴ Conduct deflection detection on the old road, detecting 40-50 points per 1km of each lane to gain a detailed understanding of the road's load-bearing capacity. ⑵ Conduct on-site cold recycling and crushing sampling of old road structural materials to determine the thickness of the asphalt layer, base material, and base thickness of the old road, and grasp the structural strength; Conduct grading and mix proportion tests in the laboratory, and determine the maximum dry density (heavy compaction) and optimal moisture content for different mix proportions. Take 3 points at a frequency of 1km. After conducting soil analysis on the structural materials of the old road, it is determined that the additive is 32.5 grade ordinary Portland cement for road use.

　　3.2机具准备

　　3.2 Equipment Preparation

　　工程开工前，应保证设备机具完好并满足施工需要，主要设备有：冷再生机、平地机、洒水车、运送水泥汽车、振动压路机、胶轮压路机、三轮压路机、推土机等。

　　Before the commencement of the project, it is necessary to ensure that the equipment and machinery are in good condition and meet the construction needs. The main equipment includes: cold recycling machine, grader, sprinkler truck, cement truck, vibratory roller, rubber tired roller, three wheeled roller, bulldozer, etc.

　　3.3材料要求

　　3.3 Material Requirements

　　⑴经破碎旧路面沥青混凝土面层及上基层获得的混合料作为冷再生结构的骨料及填充料，大于5mm的骨料质量分数应在40%～75%之间，否则应采取增加骨料或填充料的措施。

　　⑴ The mixture obtained from crushing the asphalt concrete surface layer and upper base layer of the old road surface should be used as the aggregate and filling material for the cold recycling structure. The mass fraction of aggregate larger than 5mm should be between 40% and 75%, otherwise measures should be taken to increase the aggregate or filling material.

　　⑵水泥采用强度等级为32.5级的路用普通硅酸盐水泥，初凝时间4h以上和终凝时间较长(宜在6h以上)的水泥，建议采用缓凝“大坝牌”水泥。

　　⑵ The cement used is ordinary Portland cement with a strength grade of 32.5 for road use. For cement with an initial setting time of more than 4 hours and a final setting time of more than 6 hours (preferably more than 6 hours), it is recommended to use slow setting "dam plate" cement.

　　⑶水采用不含有害物质的水或饮用水。

　　⑶ Use water that does not contain harmful substances or drinking water.

　　3.4级配和配合比

　　3.4 Grading and Mix Proportion

　　⑴对取好的混合料由实验人员编号后筛分，确认混合料的实际级配。

　　⑴ The selected mixture shall be numbered by the experimenter and screened to confirm the actual gradation of the mixture.

　　⑵抗压强度：根据级配对每一编号试块在实验室按含水泥量(质量比)5%，6%，7%试配获取三种水泥含量的最大干密度和最佳含水量，并在规定温度下，试件保湿养生6d，浸水24h后，按《公路工程无机结合料稳定材料试验规程》进行无侧限抗压强度试验获取7d标准抗压强度，根据试验结果最终确定设计添加水泥量。

　　⑵ Compressive strength: According to the grading, each numbered test block is tested in the laboratory with a cement content (mass ratio) of 5%, 6%, and 7% to obtain the maximum dry density and optimal moisture content of the three cement contents. The specimens are kept moist and cured for 6 days at the specified temperature, immersed in water for 24 hours, and then subjected to an unconfined compressive strength test according to the "Test Regulations for Inorganic Bonding Materials in Highway Engineering" to obtain a standard compressive strength of 7 days. The final design cement addition amount is determined based on the test results.

　　4施工方案与施工工艺

　　4 Construction Plan and Construction Technology

　　就我国北方地区道路结构来讲，以水泥作为添加料对沥青混凝土路面进行就地冷再生是最常用的一种方案，水泥的通常用量按重量计在3%～7%之间比较合适。

　　In terms of road structure in northern China, using cement as an additive for on-site cold recycling of asphalt concrete pavement is the most commonly used solution. The usual amount of cement used is between 3% and 7% by weight, which is more appropriate.

　　冷再生为新工艺，施工经验相对较少，为确保工程质量，先期进行了300米的试验路段，通过旧路材料筛分、击实试验，确定各项参数指标，最后明确其主要施工工艺如下：

　　Cold recycling is a new process with relatively little construction experience. To ensure project quality, a 300 meter test section was conducted in advance. Through screening and compaction tests of old road materials, various parameter indicators were determined. Finally, the main construction process was clarified as follows:

　　4.1旧路面破碎拌和

　　4.1 Mixing of broken old road surfaces

　　旧路面再生采用Wirtgen2500冷拌再生机，该机最大工作宽度为250cm，最大拌和深度40cm，能保证连续拌和，具有很高的生产率，能精确控制铺筑厚度。工作深度一旦确定，则转子的切削深度将由传感器及控制系统保证，从而获得精确的冷再生厚度；可半封闭施工，改善交通中断状况及施工安全。为避免出现条梗，相邻两幅重叠20cm～30cm。工作时，冷再生机需一辆洒水车搭配保证拌和用水，拌和过程按10%含水量加水，随拌随检查含水量，拌和行进速度8m～0m/min，有专人随时跟机检测拌和深度，确保拌合料含水量及拌合层厚度。破碎拌和后，经筛分大颗粒内如颗粒团过多，可用再生机或路拌机加拌一次，水分不足路段，加拌前及时补洒水，保证再生混合料的稳定性。

　　The old road surface is regenerated using the Wirtgen2500 cold mixing regeneration machine, which has a maximum working width of 250cm and a maximum mixing depth of 40cm, ensuring continuous mixing and high productivity. It can accurately control the paving thickness. Once the working depth is determined, the cutting depth of the rotor will be ensured by sensors and control systems to obtain accurate cold regeneration thickness; Semi enclosed construction can improve traffic interruption and construction safety. To avoid the appearance of stripes, adjacent frames should overlap by 20cm to 30cm. When working, the cold recycling machine requires a sprinkler truck to ensure mixing water. During the mixing process, water is added at a moisture content of 10%, and the moisture content is checked as it is mixed. The mixing speed is 8m~0m/min, and a dedicated person is present to monitor the mixing depth to ensure the moisture content of the mixture and the thickness of the mixing layer. After crushing and mixing, if there are too many particle clusters in the sieved large particles, a recycling machine or road mixer can be used to add them once. For sections with insufficient moisture, timely watering should be added before adding to ensure the stability of the recycled mixture.

　　4.2路面混合料分析

　　4.2 Analysis of Road Mixture

　　拌和后的旧料分析包括旧料的筛分结果，最佳含水量，最大干密度以及松铺量的确定，作业段合理长度确定。实验室从现场均衡取料，通过对拌合料的筛分，通过多次击实试验，确定粒料的最大干密度为2.25g/cm3，最佳含水量为9.5%，松铺厚度为1.33。通过冷再生的延迟时间对强度的影响试验，确定延迟时间为4h。施工中，严格控制从加水泥开始拌和到碾压完成的时间在4h内完成，通过试验段确定工作段的合理长度为160m。

　　The analysis of the mixed old materials includes the screening results of the old materials, the determination of the optimal moisture content, maximum dry density, and loose paving amount, as well as the determination of the reasonable length of the operation section. The laboratory evenly collected materials from the site, screened the mixture, and conducted multiple compaction tests to determine that the maximum dry density of the granules was 2.25g/cm3, the optimal moisture content was 9.5%, and the loose laying thickness was 1.33. Through the experiment on the influence of cold regeneration delay time on strength, the delay time was determined to be 4 hours. During construction, the time from mixing with cement to rolling completion was strictly controlled to be completed within 4 hours. The reasonable length of the working section was determined to be 160m through the experimental section.

　　4.3破碎后的旧路整形

　　4.3 Reshaping of Broken Old Roads

　　整幅路段拌和完成后，用平地机初步整平，再用震动压路机稳压二遍，测量人员根据设计纵断高程和横坡度，每10米为一断面分左中右及1/4处五个点测出高程，按1.33的松铺系数，人工找出基准点，相邻两个点用石灰连成线，高程不足时及时用平地机刮平。通过旧路整形达到“调坡”、“调拱”的目的，且保证平整度。

　　After the entire road section is mixed, it is preliminarily leveled with a grader, and then stabilized twice with a vibratory roller. The measuring personnel measure the elevation at five points on the left, middle, right, and 1/4 of the section every 10 meters based on the designed longitudinal elevation and cross slope. According to the loose paving coefficient of 1.33, the reference point is manually found, and adjacent points are connected with lime to form a line. If the elevation is insufficient, the grader is used to scrape it flat in a timely manner. By reshaping the old road, the goal of "slope adjustment" and "arch adjustment" can be achieved while ensuring smoothness.

　　4.4施工工艺与注意事项

　　4.4 Construction Technology and Precautions

　　摊铺水泥采用方格网法，水泥剂量按4%控制，为25t/1000m。具体操作方法是根据冷再生层的宽度，确定摆放水泥的行数和间距，划出方格网，人丁摊匀水泥。

　　The cement paving adopts the grid method, and the cement dosage is controlled at 4%, which is 25t/1000m. The specific operation method is to determine the number of rows and spacing of cement placement based on the width of the cold recycling layer, draw a grid, and evenly distribute the cement among the population.

　　冷再生机对原路面进行旧路材料和水泥充分加水拌和，有关试验人员应立即现场检测含水量，使冷再生的含水量比最佳含水量高出1%～2%，以满足水泥水化作用的需要，同时弥补碾压过程中含水量的损失。拌和时再生机行走速度控制在6m/min。水车在冷再生机前面用水带与之相连并同步进行，为冷再生机加水。水车与冷再生机连接拆卸与安装选在每一施工段起点进行。

　　The cold recycling machine thoroughly mixes old road materials and cement with water on the original road surface. The relevant testing personnel should immediately check the moisture content on site, so that the moisture content of cold recycling is 1% to 2% higher than the optimal moisture content, in order to meet the needs of cement hydration and compensate for the loss of moisture content during the rolling process. The walking speed of the regeneration machine during mixing is controlled at 6m/min. The water wheel is connected to and synchronized with the water belt before the cold regeneration machine, adding water to the cold regeneration machine. The dismantling and installation of the connection between the water wheel and the cold regeneration machine should be carried out at the starting point of each construction section.

　　冷再生混合料拌和均匀后，用YZ14振动压路机排压一遍，速度控制在3km/h。排压过程中若发现含水量不均匀或不平处，应将补料连同其下层混合料一起翻松10em，刮平后再压实，经过排压之后，用平地机按设计高程整平至符合设计标准。

　　After mixing the cold recycled mixture evenly, use a YZ14 vibratory roller to release pressure once, with a speed controlled at 3km/h. If uneven or uneven moisture content is found during the compaction process, the supplementary material and its lower layer mixture should be loosened for 10 meters, scraped flat, and then compacted. After compaction, a grader should be used to level the material according to the design elevation to meet the design standards.

　　⑴碾压组合：碾压遵循先轻后重，先慢后快的原则，先用YZ14振动压路机稳压一遍，YZ18振动压路机压四到五遍，三轮压路机静压两遍，20t胎压路机压两遍。碾压时注意错轴宽度，并由路边向路中心依次碾压，终压之后；冷再生层应平整光滑，表面有水浆渗出，注意终压完成时间不能超过水泥终凝时间。碾压完成后灌砂法测定压实度，保证密实度满足设计要求。

　　⑴ Rolling combination: Rolling follows the principle of light first and then heavy, slow first and then fast. First, use YZ14 vibratory roller to stabilize the pressure once, YZ18 vibratory roller to roll four to five times, three wheeled roller to static press twice, and 20t tire roller to roll twice. Pay attention to the width of the wrong axis when rolling, and roll from the roadside to the center of the road in sequence, after the final rolling; The cold regeneration layer should be flat and smooth, with water slurry seeping out from the surface. It is important to note that the final pressing time should not exceed the final setting time of the cement. After compaction, the sand filling method is used to determine the compaction degree to ensure that it meets the design requirements.

　　⑵施工时间控制：试验段施工过程中冷再生机平均速变为6m/min。施工过程中应尽量减少无故停机时间和刮平时间，确保总体上每一段落施工时间在4.5小时以内。

　　⑵ Construction time control: During the construction process of the test section, the average speed of the cold recycling machine is changed to 6m/min. During the construction process, efforts should be made to minimize unnecessary downtime and leveling time, ensuring that the overall construction time for each section is within 4.5 hours.

　　⑶养生：碾压成形四小时后(视气温情况)，可以用潮湿的帆布和其他合适的潮湿材料覆盖。在整个养生期间，都应保持覆盖材料处于潮湿状态。也可用水车在冷再生层上直接淋水养护。在七天内禁止放行交通，全天候养生，始终保持表面湿润。

　　⑶ Health preservation: After four hours of compaction (depending on the temperature), it can be covered with damp canvas and other suitable damp materials. Throughout the entire health preservation period, the covering material should be kept in a moist state. Water trucks can also be used to directly spray water on the cold regeneration layer for maintenance. Prohibit traffic for seven days, maintain health around the clock, and keep the surface moist at all times.

　　5质量控制与检测

　　5 Quality Control and Testing

　　由于冷再生基层属于新的结构形式，在《质量检验评定标准》中没有相应的检测项目和检测指标[2-3]，施工过程中在收集和分析大量试验数据的基础上，提出了主要检测项目与检测方法：

　　Due to the fact that the cold recycling base belongs to a new structural form, there are no corresponding testing items and indicators in the "Quality Inspection and Evaluation Standards" [2-3]. During the construction process, based on the collection and analysis of a large amount of experimental data, the main testing items and methods were proposed:

　　5.1铣刨深度：再生机行进过程中，通过计算机按照设计深度进行铣刨，根据不同路况人工随时量取铣刨深度，看是否满足要求；

　　5.1 Milling depth: During the movement of the regeneration machine, milling is carried out according to the design depth through a computer, and the milling depth is manually measured at any time according to different road conditions to see if it meets the requirements;

　　5.2横坡、纵断高程：初压后，利用水准仪按松铺2cm、每20米测1个断面(3个点)控制平地机工作，横坡偏差为±0.3%，中线高程偏差+5、-10mm；

　　5.2 Cross slope and longitudinal elevation: After initial compaction, use a level to measure one section (3 points) every 20 meters at a loose spread of 2cm to control the operation of the grader. The cross slope deviation is ± 0.3%, and the centerline elevation deviation is+5 and -10mm;

　　5.3压实度：终压完毕后，用灌砂法按《公路工程质量评定标准》附录B检查，一般每100米1处；

　　5.3 Compaction degree: After the final compaction is completed, use the sand filling method to check according to Appendix B of the "Quality Evaluation Standards for Highway Engineering", generally at one point every 100 meters;

　　5.4平整度：终压完毕后，采用三米直尺每100米随机量测一处10尺，允许偏差≤8mm；

　　5.4 Flatness: After the final pressing is completed, use a three meter ruler to randomly measure 10 feet every 100 meters, with a permissible deviation of ≤ 8mm;

　　5.5七天无侧限抗压强度：水泥及水的计量通过水泥稀浆车计算机控制。每工作班制备1组试件，试件六天洒水养生，一天浸水养生，测定抗压强度。一般强度可达2.8～3.1MPa(按水泥添加剂5.0%计量)；

　　5.5 Seven day unconfined compressive strength: The measurement of cement and water is controlled by the computer of the cement slurry truck. Prepare one set of specimens for each work shift, water the specimens for six days for curing, soak them in water for one day for curing, and measure their compressive strength. The general strength can reach 2.8-3.1MPa (measured as 5.0% cement additive);

　　5.6弯沉值：半刚性基层施工完毕、不间断洒水养生七天后，采用贝克曼梁法对行车道和超车道按每20米一点进行测量。再生后弯沉值一般可比原路面提高60%左右。

　　5.6 Deflection value: After the completion of semi-rigid base construction and continuous watering for seven days, the Beckman beam method is used to measure the driving and overtaking lanes at a point every 20 meters. The deflection value after regeneration can generally be increased by about 60% compared to the original road surface.

　　6社会经济效益分析

　　6. Analysis of Social and Economic Benefits

　　原设计方案是将旧沥青混凝土路面和基层全部挖除，然后再重新做基层和面层。这种技术方案不仅造价高，工期长，会产生大量铣刨材料，浪费资源，污染环境，而且需长时间中断交通，社会影响差。

　　The original design plan was to completely excavate the old asphalt concrete pavement and base layer, and then redo the base layer and surface layer. This technical solution not only has high cost and long construction period, but also generates a large amount of milling materials, wastes resources, pollutes the environment, and requires long-term interruption of traffic, resulting in poor social impact.

　　实施方案中采用水泥现场冷再生技术，该技术是利用公路原路基做基层，将旧沥青砼路面按方格人工摊铺水泥，经过冷再生工艺后作为路面的中下面层，然后再铺沥青砼上面层。该技术不仅可以很好地解决原路段的病害，使其在功能上得到恢复，结构上得到补强，而且公路旧料全部得到利用，减少了资源的过度消耗，降低了造价，同时对交通干扰也小。

　　In the implementation plan, cement on-site cold recycling technology is adopted. This technology uses the original roadbed of the highway as the base layer, and manually spreads cement on the old asphalt concrete pavement in a grid pattern. After the cold recycling process, it is used as the middle and lower layers of the pavement, and then the asphalt concrete upper layer is laid. This technology can not only effectively solve the diseases of the original road section, restoring its functionality and strengthening its structure, but also fully utilize the old materials of the highway, reducing excessive resource consumption, lowering costs, and minimizing traffic interference.

　　6.1方案费用

　　6.1 Scheme cost

　　6.1.1路面结构形式

　　6.1.1 Road surface structure form

　　原设计方案：挖除、弃运旧沥青路面，4cmAK-13C细粒式改性沥青混凝土上面层，6cmAC-20I中粒式沥青混凝土中面层，6cmAC-25I粗粒式沥青混凝土下面层，32cm水泥稳定碎石基层，18cm水泥稳定碎石底基层。实施方案：5cmAC-16C细粒式沥青混凝土上面层，18cm冷再生中下面层(含铣刨、摊铺、碾压)，沥青下封层，基层为原路面基层直接利用，不需处理。

　　Original design plan: Excavate and dispose of old asphalt pavement, 4cm AK-13C fine-grained modified asphalt concrete upper layer, 6cm AC-20I medium grained asphalt concrete middle layer, 6cm AC-25I coarse-grained asphalt concrete lower layer, 32cm cement stabilized crushed stone base layer, 18cm cement stabilized crushed stone base layer. Implementation plan: 5cm AC-16C fine-grained asphalt concrete upper layer, 18cm cold recycled middle and lower layer (including milling, paving, and rolling), asphalt lower seal layer, and base layer directly used as the original pavement base layer without treatment.

　　6.1.2费用对比

　　6.1.2 Cost Comparison

　　原设计方案细目名称费用：挖除、弃运旧沥青路面：45761元

　　Original design scheme detailed item name Cost: Excavation and disposal of old asphalt pavement: 45761 yuan

　　4cmAK-13C细粒式改性沥青砼上面层：396532元

　　4cm AK-13C fine-grained modified asphalt concrete upper layer: 396532 yuan

　　6cmAC-20I中粒式沥青砼中面层：353280元

　　6cmAC-20I medium grained asphalt concrete intermediate layer: 353280 yuan

　　6cmAC-25I粗粒式沥青砼下面层：308674元

　　6cm AC-25I coarse-grained asphalt concrete lower layer: 308674 yuan

　　32cm水泥稳定碎石基层：496873元

　　32cm cement stabilized crushed stone base: 496873 yuan

　　18cm水泥稳定碎石底基层：250841元

　　18cm cement stabilized crushed stone subbase: 250841 yuan

　　合计：1851961元

　　Total: 1851961 yuan

　　实施方案细目名称费用：

　　Implementation Plan Detail Name Cost:

　　5cmAC-16C细粒式沥青砼上面层：419143元

　　5cm AC-16C fine-grained asphalt concrete upper layer: 419143 yuan

　　18cm水泥冷再生中下面层：354954元

　　18cm cement cold recycled middle and lower layer: 354954 yuan

　　沥青下封层：107272元

　　Asphalt sealing layer: 107272 yuan

　　合计：881369元

　　Total: 881369 yuan

　　由以上方案费用对比表可清晰反映，实施方案由于直接利用旧路基层、底基层，既减少了挖除和运输旧路废料的费用，也无需花费重新铺基层、底基层的费用，冷再生作中下面层，含铣刨、摊铺、碾压一系列费用，再在其上加一层5cm细粒式沥青砼上面层做罩面即可开放交通，工序简单，费用节省近50%，其经济性是非常具有吸引力的。

　　From the cost comparison table above, it can be clearly reflected that the implementation plan directly utilizes the old road base and sub base, which reduces the cost of excavating and transporting old road waste, and does not require the cost of re laying the base and sub base. Cold recycling is used as the middle and lower layers, including milling, paving, and rolling costs, and then a 5cm fine-grained asphalt concrete upper layer is added as a cover to open up traffic. The process is simple and the cost is saved by nearly 50%. Its economy is very attractive.

　　7环境保护：

　　7 Environmental Protection:

　　公路事业的迅猛发展，也使各种天然筑路材料已日渐匮乏，而且在过量的开采筑路材料的同时，我们的生态环境也遭到了严重的破坏。对于城市道路维修，其清除的旧路材料也同样严重的影响了周围的环境，所以充分利用旧路材料进行旧路维修，是一种在保护环境的前提下，又大量地节约了工程费用。

　　The rapid development of the highway industry has also led to a gradual shortage of various natural road building materials, and while excessive exploitation of road building materials has occurred, our ecological environment has also been severely damaged. For urban road maintenance, the removal of old road materials also seriously affects the surrounding environment. Therefore, making full use of old road materials for old road maintenance is a way to save a lot of engineering costs while protecting the environment.

　　综上所述，冷再生作为一种新兴的施工技术，在我国公路事业飞速发展的今天，将会以其独特的施工工艺、特点、牢固立足于公路施工工艺的竞争行列之中。与传统筑路方法相比，“就地冷再生技术”可缩短工期、提高作业效率，完全利用废旧材料，大大节省施工成本，对交通的干扰最小。老郑龙路冷再生新技术为旧路更新改造探索了新途径，积累了新经验。

　　In summary, as an emerging construction technology, cold recycling will firmly establish itself in the competitive field of highway construction technology with its unique construction techniques, characteristics, and advantages in the rapidly developing highway industry in China today. Compared with traditional road construction methods, "on-site cold recycling technology" can shorten the construction period, improve operational efficiency, fully utilize waste materials, greatly save construction costs, and minimize interference with traffic. The new technology of cold regeneration on Laozhenglong Road has explored new ways and accumulated new experience for the renovation of old roads.

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