What are the classification methods for asphalt pavement regeneration

What are the classification methods for asphalt pavement regeneration
There are two main types of regeneration methods for old asphalt pavement: on-site regeneration and factory mix regeneration. The former can be further divided into on-site geothermal regeneration and on-site cold regeneration.
For geothermal regeneration construction, a comprehensive regeneration and resurfacing unit is used to continuously achieve process plans such as heating, scarifying, adding regenerant, heating mixing, and paving. This plan requires that the damage to the road surface layer be relatively light, and the connecting layer and foundation layer are intact. The thickness of the old pavement layer is greater than 50mm, and the depth of damage caused by various road diseases is less than 50mm. The penetration of old asphalt exceeds 20 (1/10mm), and the crack area is less than 40%. The characteristics of geothermal regeneration are short construction period, small traffic interference, small transportation volume, and good environmental protection. However, the equipment system is complex, the technical level is high, and the investment is large. The process flexibility is poor, and existing paving equipment and technology cannot be utilized.
The on-site cold recycling construction process can be used to reconstruct the damaged pavement and subgrade of 100mm to 500mm. First, mill and crush and collect the old pavement materials, add a certain amount of lime, cement, emulsified asphalt or foam asphalt and other additives, and mix them as the recycled base course mixture. On this base layer, a layer of wearing layer and suitable surface treatment will be applied as the surface layer, forming a new road for use.
Plant mixed recycling refers to transporting milled old asphalt pavement materials to a mixing plant (station), crushing and screening them, and then using some or all of the old materials according to the requirements of different old materials and renovated roads, adding a certain amount of asphalt or recycling agent, heating and mixing them, and transporting them to the construction site for paving and rolling. Plant mixed regeneration can be divided into two types: continuous and intermittent.
The process and quality of plant-mixed recycling are easy to control, and different old materials can be recycled. It is suitable for the recycling of various materials, with a long construction cycle, high traffic interference, and transportation costs. However, existing construction equipment can be utilized, with low investment and easy project implementation.