Cold recycling material forming
The properties of cold recycled materials are not the same as those of traditional road materials, so the forming requirements are not the same. Cold recycled materials can be roughly divided into two types according to regenerants
Inorganic regenerant and asphalt regenerant, when asphalt is recycled, a small amount of cement is often added to improve its water damage resistance. The more commonly used inorganic regenerant is cement, and the others are lime fly ash, cement fly ash, etc.
Inorganic stable cold recycling is generally formed and cured according to traditional semi-rigid materials. Heavy compaction test or vibration compaction test shall be conducted at room temperature, and curing at 20 ℃ or 25 ℃ for 7 days.
The water content was determined by the relationship between water content and strength. The situation of cold recycling of asphalt stabilizer is complex, and there is no unified method.
The common method of composition design of cold recycled materials is to determine the amount of liquid by compaction, and determine the amount of asphalt by one or more of Marshall stability, dry splitting strength and wet splitting strength.
Cold recycling pavement structure
The basic structure of cold recycling abroad is: hot mix asphalt mixture layer + cold recycling layer + old base. The old base is generally gravel base.
At present, the most commonly used structures of domestic cold recycling roads are hot mix asphalt mixture layer + recycling layer + semi-rigid layer and hot mix asphalt mixture layer + recycling layer.
With a large number of pavements entering the maintenance period in China, the cold recycling technology will be more widely used. This paper summarizes the main points of regeneration technology at home and abroad.
There is no special evaluation method for pre cold recycling evaluation in China, which needs further study;
In the construction of cold recycling in our country, there are many cement as recycling agent, and its experimental method has been more unified, mainly referring to the traditional semi-rigid materials; while the experimental method of asphalt as recycling agent is not unified, so it needs further research to determine the reasonable experimental method.
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