冷再生混合料強(qiáng)度形成是漸進(jìn)過程，受材料、工藝和環(huán)境影響，分物理固結(jié)、化學(xué)反應(yīng)與強(qiáng)度穩(wěn)定三階段，相互關(guān)聯(lián)決定終強(qiáng)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(jié)階段為 1-7 天，是強(qiáng)度形成基礎(chǔ)。通過機(jī)械壓實(shí)讓混合料顆粒緊密排列，空隙率從 20%-25% 降 10%-15%，顆粒嵌擠形成初步骨架。輪胎壓路機(jī)揉搓使細(xì)集料填充間隙，振動(dòng)壓路機(jī)（25-30Hz）促進(jìn)顆粒重排增強(qiáng)密實(shí)度。適量水（比含水率高 1%-2%）潤滑集料，過量易成 “橡皮土”。乳化或泡沫瀝青水分蒸發(fā)，瀝青微粒在集料表面聚結(jié)形成薄膜，初步粘結(jié)顆粒。此時(shí)早期強(qiáng)度（7 天無側(cè)限抗壓強(qiáng)度）依賴物理嵌擠，達(dá) 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(xué)反應(yīng)階段 7-28 天，是強(qiáng)度提升關(guān)鍵。水分進(jìn)一步蒸發(fā)，化學(xué)作用主導(dǎo)強(qiáng)度增長。水泥或石灰等添加劑與水反應(yīng)生成水化產(chǎn)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(xué)鍵，增強(qiáng)整體性。乳化瀝青 3-5 天破乳后形成連續(xù)瀝青膜，與水化產(chǎn)物構(gòu)成復(fù)合膠結(jié)體系 —— 水化產(chǎn)物提供抗壓強(qiáng)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(shí)，無側(cè)限抗壓強(qiáng)度達(dá) 1.5-3.0MPa，劈裂強(qiáng)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(qiáng)度穩(wěn)定階段從 28 天持續(xù)數(shù)月數(shù)年，強(qiáng)度增長平緩，表現(xiàn)為結(jié)構(gòu)致密化與性能優(yōu)化。水化反應(yīng)持續(xù)，產(chǎn)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(jié)力緩慢增強(qiáng)。環(huán)境影響長期強(qiáng)度：干燥環(huán)境需定期補(bǔ)水（尤其夏季）；凍融循環(huán)（-10℃ 20℃）可能產(chǎn)生凍脹應(yīng)力，需保證抗凍性（25 次循環(huán)后強(qiáng)度損失≤20%）。3 個(gè)月后強(qiáng)度基本穩(wěn)定（波動(dòng)≤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(xié)同決定終性能：物理固結(jié)為化學(xué)反應(yīng)提供密實(shí)基礎(chǔ)，化學(xué)反應(yīng)強(qiáng)化顆粒連接，強(qiáng)度穩(wěn)定階段鞏固優(yōu)化性能。施工中需把控各階段關(guān)鍵：壓實(shí)度保證物理嵌擠充分，養(yǎng)護(hù)條件確?；瘜W(xué)反應(yīng)完全，后期環(huán)境管理延長強(qiáng)度穩(wěn)定期，使冷再生混合料滿足道路基層要求，平衡資源循環(huán)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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