在道路维修与重建领域，冷再生技术作为一种绿色施工方案，正逐步改变传统“开挖-外运-新料填筑”的粗放模式。该技术通过常温下对旧路面材料进行原位再生，实现资源闭环利用，其技术路径可分解为材料活化、级配优化与性能重塑三个核心环节。

　　In the field of road maintenance and reconstruction, cold recycling technology, as a green construction scheme, is gradually changing the traditional extensive mode of "excavation transportation new material filling". This technology achieves closed-loop resource utilization by in-situ regeneration of old pavement materials at room temperature. Its technical path can be decomposed into three core steps: material activation, gradation optimization, and performance reshaping.

　　材料活化：唤醒沉睡的旧料价值

　　Material activation: awakening the dormant value of old materials

　　旧沥青路面经铣刨机破碎后，形成包含沥青胶结料与集料的混合料。冷再生技术的突破在于通过专用再生剂，老化沥青的活性。这类再生剂通常含有芳烃油与增塑剂，其分子链可渗透沥青质微胶束，使针入度恢复40（0.1mm）以上，软化点降低55℃以下，重塑沥青的延展性与粘结性。某高速公路大修项目实测显示，经再生剂处理后的旧料，其沥青含量回收率达85%，较传统热再生工艺提升30%。

　　After the old asphalt pavement is crushed by a milling machine, a mixture containing asphalt binder and aggregate is formed. The breakthrough of cold recycling technology lies in activating the activity of aged asphalt through dedicated rejuvenators. This type of rejuvenator usually contains aromatic oil and plasticizers, whose molecular chains can penetrate into asphalt micelles, restoring penetration to above 40 (0.1mm) and reducing softening point to below 55 ℃, reshaping the ductility and adhesion of asphalt. The actual measurement of a highway overhaul project shows that the asphalt content recovery rate of the old material treated with a rejuvenator reaches 85%, which is 30% higher than the traditional hot recycling process.

　　级配优化：构建科学骨架结构

　　Grading optimization: building a scientific skeleton structure

　　破碎后的旧料需经过振动筛分，形成0-31.5mm的连续级配。针对粒径＞20mm的粗集料，采用冲击式破碎机进行整形，使针片状含量控制在15%以内。对于细料部分，通过添加0-5mm石屑或机制砂，调整混合料空隙率12%-18%。某市政道路改造中，优化后的级配使再生混合料动稳定度达到4500次/mm，超越普通沥青混凝土标准。

　　The crushed old material needs to undergo vibration screening to form a continuous gradation of 0-31.5mm. For coarse aggregates with a particle size greater than 20mm, an impact crusher is used for shaping to control the needle like content within 15%. For the fine material part, adjust the porosity of the mixture to 12% -18% by adding 0-5mm stone chips or machine-made sand. In the renovation of a municipal road, the optimized gradation achieved a dynamic stability of 4500 times/mm for the recycled mixture, surpassing the standard of ordinary asphalt concrete.

　　性能重塑：复合添加剂的魔法

　　Performance Reshaping: The Magic of Composite Additives

　　为弥补旧料性能衰减，需精准投加复合添加剂。水泥作为常用活性填料，掺量控制在1.5%-2.5%时，可与旧沥青发生火山灰反应，生成钙矾石晶体增强内聚力。某寒区项目采用3%硅灰改性，使再生混合料-20℃弯曲应变提升2800με，抗裂性能超越新料。对于重载交通路段，加入0.3%聚酯纤维可形成三维网状结构，某物流园区道路实测显示，车辙深度较常规工艺减少65%。

　　To compensate for the performance degradation of old materials, it is necessary to accurately add composite additives. When cement is used as a commonly used active filler and the dosage is controlled at 1.5% -2.5%, it can undergo volcanic ash reaction with old asphalt, generating ettringite crystals to enhance cohesion. A certain cold region project uses 3% silica fume modification to increase the bending strain of the recycled mixture at -20 ℃ to 2800 μ ε, and its crack resistance exceeds that of the new material. For heavy-duty traffic sections, adding 0.3% polyester fiber can form a three-dimensional network structure. Actual measurements of roads in a logistics park show that the depth of ruts is reduced by 65% compared to conventional processes.

　　施工工艺的创新融合

　　Innovative integration of construction technology

　　冷再生设备集成铣刨、破碎、拌和功能，通过计算机控制系统实现精准投料。以WR2500S型冷再生机为例，其工作宽度达2.5米，深度可调50cm，单次作业即可完成旧料再生与新料掺配。在某山区公路项目中，该设备使施工效率提升800㎡/h，较传统工艺缩短工期40%。后续采用双钢轮压路机与胶轮压路机组合碾压，使再生层压实度达到98%以上。

　　The cold recycling equipment integrates milling, crushing, and mixing functions, and achieves precise feeding through a computer control system. Taking the WR2500S cold recycling machine as an example, its working width can reach 2.5 meters, and its depth can be adjusted to 50cm. It can complete the regeneration of old materials and the blending of new materials in a single operation. In a mountainous highway project, this equipment increased construction efficiency to 800 square meters per hour, shortening the construction period by 40% compared to traditional techniques. Subsequently, a combination of double steel wheel rollers and rubber wheel rollers will be used for compaction, achieving a compaction degree of over 98% for the recycled layer.

　　环境效益的量化呈现

　　Quantitative presentation of environmental benefits

　　以1双向四车道改造为例，冷再生技术可减少石料开采3.2万吨，降低碳排放480吨，相当于植树2.6万棵。某环评报告显示，冷再生施工噪音较传统工艺降低15dB，扬尘浓度控制在0.8mg/m?以下，显著改善施工环境。在成本方面，冷再生方案较传统工艺节省费用25%-40%，某省道改建项目通过该技术实现投资回收期缩短2年。

　　Taking the 1-kilometer two-way four lane renovation as an example, cold recycling technology can reduce stone mining by 32000 tons and carbon emissions by 480 tons, equivalent to planting 26000 trees. A certain environmental impact assessment report shows that the construction noise of cold recycling is reduced by 15dB compared to traditional processes, and the dust concentration is controlled at 0.8mg/m? Significantly improve the construction environment. In terms of cost, the cold recycling solution saves 25% -40% compared to traditional processes, and a certain provincial road renovation project has achieved a 2-year reduction in investment payback period through this technology.

　　冷再生技术通过材料科学、机械工程与理念的深度融合，构建起旧路面材料的循环利用体系。从微观分子层面的沥青活化，到宏观路用性能的提升，该技术不仅实现资源的利用，更推动道路行业向绿色低碳转型。随着再生剂配方优化与智能装备迭代，冷再生技术将在“双碳”目标背景下，释放更大的生态与经济效益。

　　Cold recycling technology integrates material science, mechanical engineering, and environmental protection concepts to build a recycling system for old pavement materials. From the activation of asphalt at the micro molecular level to the comprehensive improvement of macroscopic road performance, this technology not only achieves efficient utilization of resources, but also promotes the transformation of the road industry towards green and low-carbon. With the optimization of rejuvenator formulations and the iteration of intelligent equipment, cold regeneration technology will release greater ecological and economic benefits in the context of the "dual carbon" goal.

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