Cold recycling is a recycling construction method of asphalt mixture corresponding to hot recycling. Cold recycling method is to use high-power pavement milling machine to grind, excavate and crush the pavement mixture on the original pavement, add stabilizer, cement, water (or emulsified asphalt) and aggregate for on-site mixing, use pavement mixer for on-site mixing and rolling forming. Cold recycling construction is mainly used for the repair of low-grade pavement. During road maintenance, we need to check the original road to ensure that the road maintenance can be carried out smoothly after the cold regenerator is rented.

冷再生機在公路養(yǎng)護中的應用主要有：

The application of cold regenerator in highway maintenance mainly includes:

一、舊路清查

1、 Old road inventory

冷再生技術適用于大部分瀝青混凝土舊路大修與改建工程。先需要對舊路進行詳細的調(diào)查，主要包括以下內(nèi)容：

Cold recycling technology is applicable to most asphalt concrete old road overhaul and reconstruction projects. First, a detailed survey of the old road is required, mainly including the following contents:

1、對舊路結(jié)構(gòu)和歷年修補改造情況進行調(diào)查，了解路面病害情況，包括變形、裂縫、邊緣破壞等。

1. Investigate the old road structure and the repair and reconstruction over the years to understand the pavement diseases, including deformation, cracks, edge damage, etc.

2、為了分析舊路的破壞和承載能力，有必要對舊路基層進行冷再生利用。

2. In order to analyze the damage and bearing capacity of the old road, it is necessary to carry out cold recycling of the old road base.

3、對舊路結(jié)構(gòu)進行了鉆芯試驗，以確定舊路結(jié)構(gòu)的厚度和各材料層的技術特性。

3. The core drilling test of the old road structure is carried out to determine the thickness of the old road structure and the technical characteristics of each material layer.

二、材料骨料組成

2、 Material aggregate composition

冷循環(huán)涂層的性能與混合料的級配有著顯著而密切的關系，如果舊骨料中總粒徑大于等于4.75mm（<40%）的骨料含量過低，則加入新的分級骨料；如果舊材料中總含量超過4.75mm（>80%），則會導致細材料（尤其是小于0.6mm的骨料）對空腔的填充不足。由于混合料的強度較低，因此有必要在冷凍再生混合料中添加一種稍有級配的細骨料，以形成分選良好、密實的骨架結(jié)構(gòu)，提高混合料的強度。但這樣無疑會增加冷再生結(jié)構(gòu)層的成本，需要在與新結(jié)構(gòu)層進行經(jīng)濟比較后實施。

The performance of cold cycle coating is significantly and closely related to the gradation of the mixture. If the content of aggregate with total particle size greater than or equal to 4.75mm (< 40%) in the old aggregate is too low, new graded aggregate shall be added; If the total content of old materials exceeds 4.75mm (> 80%), it will lead to insufficient filling of cavities by fine materials (especially aggregates less than 0.6mm). Due to the low strength of the mixture, it is necessary to add a slightly graded fine aggregate to the frozen recycled mixture to form a well sorted and dense skeleton structure and improve the strength of the mixture. However, this will undoubtedly increase the cost of cold regeneration structure layer, which needs to be implemented after economic comparison with the new structure layer.

冷再生技術可以充分利用舊路資源，對舊路面層及基層進行再生利用形成新的路面基層。操作簡潔，經(jīng)濟效益顯著。

Cold recycling technology can make full use of the old road resources and recycle the old pavement layer and base to form a new pavement base. The operation is simple and the economic benefit is remarkable.