泡沫瀝青冷再生技術(shù)是指通過專用的發(fā)泡設(shè)備，將瀝青進(jìn)行發(fā)泡，降低瀝青黏度，實現(xiàn)常溫拌和的目的。韓海紅 [1] 研究認(rèn)為泡沫瀝青能夠很好地平衡剛?cè)岫?，加入部分水泥后性能與熱瀝青混凝土相當(dāng)，同時又可以實現(xiàn)廢舊材料利用，減少能源消耗，降低污染排放，實現(xiàn)交通的可持續(xù)發(fā)展。時杰 [2] 采用冷再生機和攤鋪機分體式的再生工藝，完成了就地冷再生施工。為研究泡沫瀝青在普通國省道山區(qū)公路中的應(yīng)用效果，該文以四川省某國道公路泡沫瀝青就地冷再生施工為例，從配合比設(shè)計和現(xiàn)場施工兩方面入手，總結(jié)了泡沫瀝青施工工藝，為類似工程施工提供一定的參考。

　　The cold recycling technology of foam asphalt refers to the foaming of asphalt through special foaming equipment to reduce the viscosity of asphalt and achieve the purpose of mixing at room temperature. Han Haihong [1] believes that foam asphalt can well balance the stiffness and flexibility, and its performance is equivalent to that of hot asphalt concrete after adding some cement. At the same time, it can realize the utilization of waste materials, reduce energy consumption, reduce pollution emissions, and achieve sustainable development of transportation. Shijie [2] used a regeneration process that combines cold regeneration and a separate paver to complete on-site cold regeneration construction. In order to study the application effect of foam asphalt in ordinary national and provincial highways in mountainous areas, this paper takes the construction of foam asphalt on-site cold recycling of a national highway in Sichuan Province as an example, starting with mix design and on-site construction, summarizes the construction technology of foam asphalt, which provides some reference for similar engineering construction.

　　泡沫瀝青冷再生配合比設(shè)計

　　Mix design of foam asphalt cold recycling

　　泡沫瀝青就地冷再生配合比設(shè)計階段主要目的是確定發(fā)泡瀝青、合成級配、初步泡沫瀝青用量以及驗證泡沫瀝青混合料性能。具體工作內(nèi)容為：①對原材料進(jìn)行檢驗，包括發(fā)泡瀝青性能、回收料的級配和性能等；②利用專用發(fā)泡設(shè)備，以膨脹率和半衰期作為指標(biāo)，確定發(fā)泡瀝青、發(fā)泡溫度和發(fā)泡用水量；③對銑刨料級配進(jìn)行驗證，必要時確定是否需要添加新集料；④對合成集料進(jìn)行擊實試驗，確定最佳含水量和最大干密度；⑤不同泡沫瀝青用量下，成型馬歇爾試件，利用劈裂強度和干濕強度比，確定最佳泡沫瀝青用量。

　　The main purpose of the mix design stage of foam asphalt cold recycling in place is to determine the foaming asphalt, synthetic gradation, preliminary foam asphalt dosage and verify the performance of foam asphalt mixture. The specific job responsibilities include: ① inspecting raw materials, including the performance of foamed asphalt, grading and properties of recycled materials, etc.; ② Using specialized foaming equipment, with expansion rate and half-life as indicators, determine the foaming asphalt, foaming temperature, and foaming water consumption; ③ Verify the grading of milling and planing materials, and determine if new aggregates need to be added if necessary; ④ Conduct compaction tests on synthetic aggregates to determine the optimal moisture content and maximum dry density; ⑤ Under different foam asphalt dosage, Marshall specimens were formed, and the best foam asphalt dosage was determined by using splitting strength and dry wet strength ratio.

　　該工程采用同步攤鋪的就地冷再生技術(shù)，該技術(shù)是一種在對舊瀝青路面切削破碎的同時完成水、水泥、泡沫瀝青（或乳化瀝青）的添加與拌和，之后把滿足一定路用性能的冷再生混合料傳輸至攤鋪機料斗當(dāng)中，最終由攤鋪機重新把再生材料鋪筑于路面結(jié)構(gòu)中，并由壓路機完成壓實的先進(jìn)施工方案 [3-4]。就地冷再生機采用維特根生產(chǎn)的W380CR 就地冷再生機，詳見圖 1。W380CR 就地冷再生機工藝參數(shù)為基本工作寬度 3.8 m，最大再生深度 30 cm，發(fā)動機功率 708 kW，最大工作效率 800 t/h，建議再生機的工作速度控制在 4~5 m/min。

　　The project adopts the in-situ cold recycling technology of synchronous paving, which is an advanced construction scheme that completes the addition and mixing of water, cement, foam asphalt (or emulsified asphalt) while cutting and crushing the old asphalt pavement, and then transfers the cold recycling mixture that meets certain road performance to the hopper of the paver, and finally paves the recycled material in the pavement structure again by the paver, and compacts it by the road roller [3-4]. The on-site cold regeneration machine adopts the W380CR on-site cold regeneration machine produced by Wittgen, as shown in Figure 1. The process parameters of the W380CR on-site cold regeneration machine are a basic working width of 3.8 m, a maximum regeneration depth of 30 cm, an engine power of 708 kW, and a maximum working efficiency of 800 t/h. It is recommended to control the working speed of the regeneration machine at 4-5 m/min.

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