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冷再生機租賃：冷再生混合料強度形成三階段
來源：http://www.baitaiglass.com/ 日期：2025-07-16 發布人：
冷再生混合料強度形成是漸進過程，受材料、工藝和環境影響，分物理固結、化學反應與強度穩定三階段，相互關聯決定非常終強度。
The formation of strength in cold recycled mixtures is a gradual process, influenced by materials, processes, and environments. It is divided into three stages: physical consolidation, chemical reaction, and strength stability, which are interrelated to determine the final strength.
物理固結階段為 1-7 天，是強度形成基礎。通過機械壓實讓混合料顆粒緊密排列，空隙率從 20%-25% 降至 10%-15%，顆粒嵌擠形成初步骨架。輪胎壓路機揉搓使細集料填充間隙，振動壓路機（25-30Hz）促進顆粒重排增強密實度。適量水（比非常佳含水率高 1%-2%）潤滑集料，過量易成 “橡皮土”。乳化或泡沫瀝青水分蒸發，瀝青微粒在集料表面聚結形成薄膜，初步粘結顆粒。此時早期強度（7 天無側限抗壓強度）依賴物理嵌擠，達 0.5-1.0MPa。
The physical consolidation stage lasts for 1-7 days and is the foundation for strength formation. By mechanical compaction, the particles of the mixture are tightly arranged, and the porosity is reduced from 20% -25% to 10% -15%, forming a preliminary skeleton through particle interlocking. The tire roller rubs and fills the gaps with fine aggregate, while the vibrating roller (25-30Hz) promotes particle rearrangement and enhances compactness. An appropriate amount of water (1% -2% higher than the optimal moisture content) can lubricate the aggregate, and excessive water can easily form "rubber soil". Water in emulsified or foam asphalt evaporates, and asphalt particles coalesce on the aggregate surface to form a film, initially bonding particles. At this point, the early strength (7-day unconfined compressive strength) depends on physical interlocking, reaching 0.5-1.0 MPa.
化學反應階段 7-28 天，是強度提升關鍵。水分進一步蒸發，化學作用主要強度增長。水泥或石灰等添加劑與水反應生成水化產物（硅酸鈣凝膠、氫氧化鈣晶體），填充間隙并與集料表面形成化學鍵，增強整體性。乳化瀝青 3-5 天破乳后形成連續瀝青膜，與水化產物構成復合膠結體系 —— 水化產物提供抗壓強度，瀝青膜提升抗變形能力。需保持濕度≥60%，可覆蓋薄膜或每天灑水 2-3 次。28 天時，無側限抗壓強度達 1.5-3.0MPa，劈裂強度 0.2-0.5MPa，滿足基層承載要求。
The chemical reaction stage lasts for 7-28 days, which is the key to strength enhancement. Water evaporates further, and chemical reactions dominate the increase in strength. Additives such as cement or lime react with water to generate hydration products (calcium silicate gel, calcium hydroxide crystal), fill the gaps and form chemical bonds with the aggregate surface to enhance the integrity. After 3-5 days of demulsification, emulsified asphalt forms a continuous asphalt film, which forms a composite bonding system with hydration products - hydration products provide compressive strength, and the asphalt film enhances its ability to resist deformation. It is necessary to maintain a humidity of ≥ 60% and can be covered with a film or sprayed with water 2-3 times a day. At 28 days, the unconfined compressive strength reached 1.5-3.0 MPa, and the splitting strength was 0.2-0.5 MPa, meeting the requirements for bearing capacity of the base layer.
強度穩定階段從 28 天持續數月至數年，強度增長平緩，表現為結構致密化與性能優化。水化反應持續，產物填充剩余空隙（空隙率≤8%），干密度增加 1%-3%。瀝青膜隨溫度變化老化，硬度略增，與集料粘結力緩慢增強。環境影響長期強度：干燥環境需定期補水（尤其夏季）；凍融循環（-10℃至 20℃）可能產生凍脹應力，需保證抗凍性（25 次循環后強度損失≤20%）。3 個月后強度基本穩定（波動≤5%），整體具備抗變形、抗疲勞能力，基層頂面彎沉值控制在 20-40（0.01mm）。
The stable strength stage lasts from 28 days for several months to several years, with a gradual increase in strength, manifested as structural densification and performance optimization. The hydration reaction continues, and the product fills the remaining voids (void ratio ≤ 8%), increasing the dry density by 1% -3%. The asphalt film ages with temperature changes, with a slight increase in hardness and a slow increase in bonding strength with aggregates. Long term intensity of environmental impact: Dry environments require regular hydration (especially in summer); Freeze thaw cycles (-10 ℃ to 20 ℃) may generate frost heave stress, and it is necessary to ensure frost resistance (strength loss ≤ 20% after 25 cycles). After 3 months, the strength is basically stable (fluctuation ≤ 5%), and the overall ability to resist deformation and fatigue is achieved. The deflection value of the top surface of the base layer is controlled at 20-40 (0.01mm).
三階段協同決定非常終性能：物理固結為化學反應提供密實基礎，化學反應強化顆粒連接，強度穩定階段鞏固優化性能。施工中需把控各階段關鍵：壓實度保證物理嵌擠充分，養護條件確保化學反應完全，后期環境管理延長強度穩定期，使冷再生混合料滿足道路基層要求，平衡資源循環與工程性能。
The three-stage synergy determines the final performance: physical consolidation provides a dense foundation for chemical reactions, chemical reactions strengthen particle connections, and the strength stabilization stage consolidates and optimizes performance. During construction, it is necessary to control the key aspects of each stage: ensuring sufficient physical compaction, maintaining complete chemical reactions, extending the strength stability period through environmental management in the later stage, and ensuring that the cold recycled mixture meets the requirements of the road base, balancing resource cycling and engineering performance.
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