凍土區道路養護面臨極端氣候與地質條件的雙重挑戰，冷再生技術作為綠色修復方案，其層間穩定性直接決定工程壽命。針對凍融循環導致的強度衰減、界面剝離等難題，需構建涵蓋材料改性、結構優化、工藝創新的系統性解決方案。

　　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.

　　材料體系創新是基礎保障。舊料摻配比例需通過凍融劈裂試驗確定，當RAP料含量超過40%時，應添加0.3%-0.5%的納米二氧化硅進行活化處理，該改性劑可填充瀝青膜孔隙，使凍融殘留強度比提升85%以上。乳化瀝青配方需引入聚合物增韌劑，將60℃動力粘度控制在3000-5000Pa·s區間，兼顧低溫抗裂與高溫穩定性。對于重交通路段，可復配0.2%的纖維增強劑，使冷再生混合料抗拉強度提升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%.

　　結構組合設計注重應力分散。建議采用“隔溫層+冷再生層+封層”復合結構，隔溫層選用導熱系數≤0.05W/(m·K)的擠塑聚苯乙烯板，有效阻斷凍深發展。冷再生層厚度需根據交通等級調整，輕交通道路控制在12-15cm，重載道路則需增18-20cm，確保結構承載力。層間界面處理采用同步碎石封層技術，碎石覆蓋率達65%-70%，形成機械咬合與化學粘結雙重作用。

　　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.

　　施工工藝優化聚焦過程控制。舊料破碎采用反擊式破碎機，確保粒徑90%以上處于4.75-31.5mm區間。拌合溫度控制在55-65℃，避免高溫導致乳化瀝青提前破乳。攤鋪環節采用雙機聯鋪工藝，前后攤鋪機間隔5-10米，縱向接縫。碾壓工藝遵循“高頻低幅、緊跟慢壓”原則，初壓采用26噸膠輪壓路機靜壓2遍，復壓使用13噸雙鋼輪振動壓路機振壓4遍，終壓以膠輪壓路機收光，確保壓實度≥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%.

　　環境適應性改造是關鍵突破。在季節性凍土區，施工窗口期需避開地溫≤5℃時段，若必須低溫施工，應添加0.1%的早強型抗凍劑，使早期強度提升30%。對于多年凍土區，需設置熱棒路基，通過相變材料將路堤溫度場控制在-0.5℃以內。排水系統設計采用滲水盲溝+縱向排水管組合，盲溝間距根據匯水面積確定，一般控制在15-20米，防止凍脹水壓力積聚。

　　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.

　　長期性能維護建立監測體系。在道路縱斷面高程變化點、橋頭搭板末端等關鍵位置布設沉降監測點，采用靜力水準儀實時采集數據，當日沉降量超過2mm時啟動預警。每年春秋季進行雷達探地檢測，排查層間脫空、裂縫發育等隱性病害。預防性養護周期根據交通荷載等級確定，重載道路每2年實施一次微表處封層，輕載道路可延長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.

　　凍土區冷再生層穩定性提升需貫穿設計、施工、運維全周期。通過材料性能突破、結構功能復合、工藝參數精準控制，可顯著增強再生層在極端環境下的耐久性。隨著智能監測技術與新型功能材料的融合應用，凍土區道路綠色養護將邁向更加精細化、智能化的新階段。

　　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.

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