1. Technical advantages

① The old asphalt mixture milled (including the base material when milled together with the base) can be fully recycled for environmental protection at normal temperature. No heating during the whole process, zero pollution and zero emissions. Reduce the cost of raw materials and reduce environmental pollution.

②Using emulsified asphalt as the organic renewable binder and cement or lime as the inorganic renewable binder, to form a composite organic hydraulic material to provide sufficient bearing capacity.

③ The use of emulsified asphalt improves the construction conditions and prolongs the construction season.

④Compared with on-site cold regeneration, the mix ratio control is more accurate, improves the smoothness of the pavement, and ensures road performance.

2. Technical requirements for raw materials

①Return the material

The milling material should be dry and the material composition is stable, and it must be crushed and sieved before use. According to the maximum nominal particle size of the regenerated mixture, the size of the sieve aperture should be selected reasonably; the quality requirements are as follows.

Table 1 Aggregate volume requirements:

② Technical index of emulsified asphalt
Normally, slow-crack cationic emulsified asphalt should be used for cold mixing in factory. The emulsified asphalt should meet the quality requirements of the following table, and at the same time, the matrix asphalt should be determined according to the highway grade, climatic conditions, traffic conditions, pavement type and the position and stress characteristics of the structural layer, construction method, local use experience, etc Technical performance indicators.
Table 2 Technical index of emulsified asphalt:
 

③Cement
The initial setting time of cement should be above 3h, and the final setting time should be above 6h. Quick-hardening cement and early-strength cement should not be used. Cement should be loose, dry, free of agglomeration, agglomeration, and deteriorated by moisture. The cement strength grade can be 32.5 or 42.5. Other quality and technical indicators of cement should also meet the requirements of "Technical Specifications for Highway Cement Concrete Pavement Construction" (JTG F30).
④Water
It should be clean and free of organic impurities and other impurities.
3. Main equipment
The equipment used in the plant's cold recycling mainly includes: milling machine, recycled mixture mixing station, transport vehicle, paver, steel roller, rubber roller, etc.
4. Construction process

5. Scope of application
This process is suitable for the lower layer and the base layer and the base layer of the asphalt pavement of the expressway and the first and second highways, and the surface layer of the asphalt pavement of the third and fourth highways. When used in the surface layer of Grade 3 and 4 highways, the slurry seal layer, gravel seal layer, micro surface area, etc. should be used as the surface wear layer.