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What is Hot Asphalt Recycling?

What is Hot Asphalt Recycling?

Hot asphalt recycling implies a set of operations during which the worn-out pavement is first removed from the road surface, with or without resurfacing materials, and then is broken, crumpled, and granulated. The resulted mixture is then blended with bitumen and asphalt rejuvenating agents in the hot mixed asphalt plant, and finally is spread on the road surface and compacted. These materials can be modified with new stone materials, hot asphalt, or bitumen under some circumstances. Cold asphalt recycling is another form of pavement recycling that works independently of a hot mixed asphalt plant. In the cold recycling process, the surfacing materials are reused in place, with or without the base material. Indeed, asphalt recycling is a form of waste management operation.

Asphalt recycling yields benefits such as economic saving, preserving the environment, and a huge drop in air pollution.

Recycling can be done in-situ or with the help of a plant.

In-situ recycling

During in-situ recycling, the whole hot recycling process is done in-place inside the recycling machine. The recycled asphalt is then spread on the road surface and compacted. Materials do not need to be transported during in-situ recycling. This technique is mainly useful for patching or resurfacing damaged areas on the road with a thickness of 25 to 50 mm and does not alter the load-bearing capacity of the pavement.

Plant-based recycling

In plant-based recycling, reclaimed asphalt pavement (RAP) is transported to the plant and blended with stone materials, bitumen, rejuvenating agents, or fillers, and then cured. The new asphalt is transported to the damaged area, spread on the damaged place, and compacted.