道路到了使用年限，传统做法是把旧路面铣刨掉，运走废料，再重新摊铺新料。这套流程干了这么多年，问题也越来越明显：废料运输和堆放成本高，新料采购价格不低，工期还长，封路时间久了对交通影响大。近几年，越来越多的旧路改造项目开始换一种思路——就地冷再生。

When the road reaches its service life, the traditional approach is to mill off the old pavement, transport away the waste materials, and then re pave with new materials. This process has been in place for so many years, and the problems have become increasingly apparent: high transportation and stacking costs for waste materials, high procurement prices for new materials, long construction periods, and prolonged road closures have a significant impact on traffic. In recent years, more and more old road renovation projects have begun to adopt a new approach - on-site cold recycling.

冷再生到底是怎么一回事？

What exactly is cold regeneration?

简单说，冷再生就是在常温下，用专用机械把旧沥青路面和基层材料就地铣刨、破碎，加入一定比例的水泥、石灰或乳化沥青等稳定剂，再重新拌合、摊铺、突出，形成新的结构层。整个过程不需要加热，不需要把旧料运走，也不用全部换新料。旧路面本身就是原料，就地“消化”掉了。

Simply put, cold recycling is the process of milling and crushing old asphalt pavement and base materials on site using specialized machinery at room temperature, adding a certain proportion of stabilizers such as cement, lime, or emulsified asphalt, and then re mixing, paving, and rolling to form a new structural layer. The entire process does not require heating, the old materials do not need to be transported away, and there is no need to replace all the new materials. The old road surface itself is raw material, which has been 'digested' on the spot.

省在哪，快在哪？

Where is the province and where is the fast one?

冷再生的优势很直接。一是省材料，旧路面的沥青和碎石全部再利用，只需要补充少量新料和稳定剂，材料成本大幅下降。二是省运输，不用把废料运出去，也不用把新料运进来，运输费用和碳排放都减少。三是工期短，工序衔接紧凑，封路时间比传统翻修短不少，对交通影响小。四是环保，常温施工没有加热产生的烟气，废料零外运，符合现在绿色施工的方向。

The advantage of cold regeneration is very direct. One is to save materials. All the asphalt and gravel on the old road surface are reused, and only a small amount of new materials and stabilizers need to be added, resulting in a significant reduction in material costs. The second is provincial transportation, which eliminates the need to transport waste or new materials, reducing transportation costs and carbon emissions. Thirdly, the construction period is short, the process connection is compact, the road closure time is much shorter than traditional renovation, and the impact on traffic is minimal. The fourth is environmental protection. There is no smoke generated by heating during construction at room temperature, and zero waste is transported outside, which is in line with the current direction of green construction.

冷再生能解决哪些路面问题？

What road problems can cold recycling solve?

就地冷再生对大多数路面破坏类型大多能进行结构性处治。横向裂缝、纵向裂缝、反射裂缝，可以通过再生层消除或延缓；车辙和不规则不平整区域，可以在再生过程中恢复线形和断面标高；需要拓宽的路面，也可以在再生施工中一并处理。再生后的结构层承载能力比原有基层有明显提升，可以作为新路面的基层或底基层使用。

On site cold recycling can provide structural treatment for most types of pavement damage. Horizontal cracks, vertical cracks, and reflection cracks can be eliminated or delayed through the regeneration layer; Ruts and irregular uneven areas can be restored to their alignment and cross-sectional elevation during the regeneration process; The road surface that needs to be widened can also be treated together during the regeneration construction. The bearing capacity of the regenerated structural layer is significantly improved compared to the original base layer, and it can be used as the base or sub base layer for new road surfaces.

设备选型，决定了再生效果

Equipment selection determines the regeneration effect

冷再生施工的核心设备是冷再生机。不同型号的设备，铣刨深度、拌合均匀度、工作效率差别很大。小型项目可能用国产600、700型就够了，大面积的国道、高速改造则往往需要维特根2500、250S这类进口大型设备。除了冷再生机本身，配套设备也很关键——粉料撒布车负责均匀撒布水泥或石灰，平地机负责整平，压路机负责分层突出密实。这套设备之间的配合默契程度，直接影响再生层的强度和平整度。

The core equipment for cold recycling construction is the cold recycling machine. Different models of equipment have significant differences in milling depth, mixing uniformity, and work efficiency. Small scale projects may require domestically produced 600 and 700 models, while large-scale national highways and highway renovations often require imported large equipment such as the Wittgen 2500 and 250S. In addition to the cold recycling machine itself, the supporting equipment is also crucial - the powder spreader is responsible for evenly spreading cement or lime, the grader is responsible for leveling, and the roller is responsible for layering and compacting. The degree of coordination between these devices directly affects the strength and flatness of the regeneration layer.

什么情况下不适合冷再生？

Under what circumstances is cold regeneration not suitable?

冷再生不是万能方案。如果旧路面结构已经完全破坏、路基承载力严重不足，或者旧料中杂质含量过高，冷再生的效果会打折扣。另外，对路面标高有严格限制、不允许抬高的路段，也要慎重评估。施工前需要对旧路进行取芯检测和材料分析，确定旧料级配和稳定剂配方，不能凭经验拍脑袋上设备。

Cold regeneration is not a universal solution. If the old pavement structure has been completely destroyed, the roadbed bearing capacity is seriously insufficient, or the impurity content in the old material is too high, the effect of cold recycling will be compromised. In addition, road sections with strict restrictions on road elevation and not allowed to be raised should also be carefully evaluated. Before construction, it is necessary to conduct core testing and material analysis on the old road to determine the grading of the old materials and the stabilizer formula. It is not advisable to rely solely on experience to determine the equipment.

旧路改造的账，不能只算材料单价。把运输、废料处理、工期、封路影响全算进去，冷再生在很多场景下的综合成本优势就出来了。这也是为什么越来越多的工程队开始接受这种“不挖不运、就地翻新”的施工方式。

The account for the renovation of old roads cannot only be calculated based on the unit price of materials. Taking into account transportation, waste disposal, project duration, and road closure impacts, the comprehensive cost advantage of cold recycling in many scenarios becomes apparent. This is also why more and more engineering teams are beginning to accept this construction method of "no excavation, no transportation, on-site renovation".