冻土区道路养护面临极端气候与地质条件的双重挑战，冷再生技术作为绿色修复方案，其层间稳定性直接决定工程寿命。针对冻融循环导致的强度衰减、界面剥离等难题，需构建涵盖材料改性、结构优化、工艺创新的系统性解决方案。

　　The maintenance of roads in permafrost regions faces dual challenges of extreme climate and geological conditions. Cold recycling technology, as a green restoration solution, directly determines the service life of the project due to its interlayer stability. A systematic solution covering material modification, structural optimization, and process innovation is needed to address the challenges of strength attenuation and interface delamination caused by freeze-thaw cycles.

　　材料体系创新是基础保障。旧料掺配比例需通过冻融劈裂试验确定，当RAP料含量超过40%时，应添加0.3%-0.5%的纳米二氧化硅进行活化处理，该改性剂可填充沥青膜孔隙，使冻融残留强度比提升85%以上。乳化沥青配方需引入聚合物增韧剂，将60℃动力粘度控制在3000-5000Pa·s区间，兼顾低温抗裂与高温稳定性。对于重交通路段，可复配0.2%的纤维增强剂，使冷再生混合料抗拉强度提升40%。

　　Innovation in material systems is the fundamental guarantee. The mixing ratio of old materials needs to be determined through freeze-thaw splitting tests. When the RAP material content exceeds 40%, 0.3% -0.5% nano silica should be added for activation treatment. This modifier can fill the pores of the asphalt film, increasing the freeze-thaw residual strength ratio to over 85%. The emulsified asphalt formula needs to introduce polymer toughening agents to control the dynamic viscosity at 60 ℃ within the range of 3000-5000Pa · s, while balancing low-temperature crack resistance and high-temperature stability. For heavy traffic sections, 0.2% fiber reinforcement can be compounded to increase the tensile strength of cold recycled mixtures by 40%.

　　结构组合设计注重应力分散。建议采用“隔温层+冷再生层+封层”复合结构，隔温层选用导热系数≤0.05W/(m·K)的挤塑聚苯乙烯板，有效阻断冻深发展。冷再生层厚度需根据交通等级调整，轻交通道路控制在12-15cm，重载道路则需增18-20cm，确保结构承载力。层间界面处理采用同步碎石封层技术，碎石覆盖率达65%-70%，形成机械咬合与化学粘结双重作用。

　　Structural combination design emphasizes stress dispersion. It is recommended to use a composite structure of "insulation layer+cold regeneration layer+sealing layer". The insulation layer should be made of extruded polystyrene board with a thermal conductivity coefficient of ≤ 0.05W/(m · K) to effectively prevent the development of freezing depth. The thickness of the cold regeneration layer needs to be adjusted according to the traffic level. For light traffic roads, it should be controlled at 12-15cm, while for heavy traffic roads, it should be increased to 18-20cm to ensure the structural bearing capacity. The interlayer interface treatment adopts synchronous crushed stone sealing technology, with a crushed stone coverage rate of 65% -70%, forming a dual effect of mechanical interlocking and chemical bonding.

　　施工工艺优化聚焦过程控制。旧料破碎采用反击式破碎机，确保粒径90%以上处于4.75-31.5mm区间。拌合温度控制在55-65℃，避免高温导致乳化沥青提前破乳。摊铺环节采用双机联铺工艺，前后摊铺机间隔5-10米，纵向接缝。碾压工艺遵循“高频低幅、紧跟慢压”原则，初压采用26吨胶轮压路机静压2遍，复压使用13吨双钢轮振动压路机振压4遍，终压以胶轮压路机收光，确保压实度≥98%。

　　Optimization of construction technology focuses on process control. The old material is crushed using an impact crusher to ensure that over 90% of the particle size is within the range of 4.75-31.5mm. The mixing temperature should be controlled at 55-65 ℃ to avoid premature emulsification of emulsified asphalt caused by high temperature. The paving process adopts a dual machine joint paving technology, with a 5-10 meter interval between the front and rear paving machines to eliminate longitudinal joints. The compaction process follows the principle of "high-frequency low amplitude, closely following slow compaction". The initial compaction uses a 26 ton rubber wheel roller for static compaction twice, the secondary compaction uses a 13 ton double steel wheel vibratory roller for vibration compaction four times, and the final compaction is finished by the rubber wheel roller to ensure a compaction degree of ≥ 98%.

　　环境适应性改造是关键突破。在季节性冻土区，施工窗口期需避开地温≤5℃时段，若必须低温施工，应添加0.1%的早强型抗冻剂，使早期强度提升30%。对于多年冻土区，需设置热棒路基，通过相变材料将路堤温度场控制在-0.5℃以内。排水系统设计采用渗水盲沟+纵向排水管组合，盲沟间距根据汇水面积确定，一般控制在15-20米，防止冻胀水压力积聚。

　　Environmental adaptability transformation is a key breakthrough. In seasonal frozen soil areas, the construction window period should avoid the period when the ground temperature is ≤ 5 ℃. If low-temperature construction is necessary, 0.1% early strength antifreeze agent should be added to increase the early strength by 30%. For permafrost regions, it is necessary to set up a hot rod roadbed and control the temperature field of the embankment within -0.5 ℃ through phase change materials. The drainage system design adopts a combination of seepage blind ditches and longitudinal drainage pipes. The spacing between blind ditches is determined according to the catchment area, generally controlled at 15-20 meters, to prevent the accumulation of frost heave water pressure.

　　长期性能维护建立监测体系。在道路纵断面高程变化点、桥头搭板末端等关键位置布设沉降监测点，采用静力水准仪实时采集数据，当日沉降量超过2mm时启动预警。每年春秋季进行雷达探地检测，排查层间脱空、裂缝发育等隐性病害。预防性养护周期根据交通荷载等级确定，重载道路每2年实施一次微表处封层，轻载道路可延长3-4年。

　　Establish a monitoring system for long-term performance maintenance. Set up settlement monitoring points at key locations such as the elevation change point of the road profile and the end of the bridge deck, and use a static level to collect real-time data. When the daily settlement exceeds 2mm, a warning will be triggered. Radar ground detection is conducted every spring and autumn season, with a focus on identifying hidden diseases such as interlayer voids and crack development. The preventive maintenance period is determined based on the level of traffic load. For heavy-duty roads, a micro surface sealing layer is implemented every 2 years, while for light-duty roads, it can be extended to 3-4 years.

　　冻土区冷再生层稳定性提升需贯穿设计、施工、运维全周期。通过材料性能突破、结构功能复合、工艺参数精准控制，可显著增强再生层在极端环境下的耐久性。随着智能监测技术与新型功能材料的融合应用，冻土区道路绿色养护将迈向更加精细化、智能化的新阶段。

　　The stability improvement of the cold regeneration layer in frozen soil areas needs to be carried out throughout the entire design, construction, and operation cycle. By breaking through material properties, combining structural functions, and precisely controlling process parameters, the durability of the regeneration layer can be significantly enhanced in extreme environments. With the integration and application of intelligent monitoring technology and new functional materials, green maintenance of roads in frozen soil areas will move towards a new stage of refinement and intelligence.

　　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 information, 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.