Deji Machinery Co., Ltd.: "Two or Three Things" of Reclaimed Asphalt Mixture (RAP)

If you are reading this article，You probably already know about recycled pavement.RAPRepresents“Reclaimed asphalt mixture material”。BecauseRAPThe material can be recycled as part of a hot recycled asphalt mixture，It has been favored by the majority of asphalt concrete suppliers.。Next, I will share with you the recycled asphalt material.“Two or three things”。

01

Formation of reclaimed asphalt material

With the rapid development of China's economy,，China's transportation industry has also achieved earth-shaking changes.，The construction of overpasses and expressways in cities constantly strives for excellence in quality and design.，During this period, with the increase of the service life of asphalt pavement,，Due to the aging of the road surface，Heavy load effect of traveling crane，The rate of destruction will be greatly accelerated.。High-grade highway in China、Municipal roads generally enter large、Medium repair、Curing、Reconstruction and expansion period, etc.，A large number of waste asphalt pavement materials will be produced every year in China.（RAP）-Reclaimed asphalt material。

02

Recovery of reclaimed asphalt

Regeneration（RAP）The common recovery methods of materials are generally：Excavation and recovery of old pavement、Cold milling recovery of Milling Machine、Cold Milling Machine、Mechanical or manual excavation methods such as pneumatic picks, etc.。The old asphalt pavement which needs to be regenerated is damaged and recycled.，Excessive mixing of non-bituminous mixture materials shall be avoided as much as possible during recovery。

03

Pretreatment of Recycled Asphalt

Reclaimed regeneration（RAP）The material shall be subject to crushing and screening pretreatment，To ensure a moderate particle size gradation。The scarification and recycling of old pavement will mix several layers of asphalt mixtures of different specifications together.，Difficult to process in layers and grades，Aggregate gradation range will be limited when reused。In the later production process, it is necessary to use professional equipment to carry out particle size classification pretreatment for recycled materials.，Rejection is greater than 37.5mmMaterial，Sieved into two or three grades of materials for use。

Sample after pretreatment of recovered material

04

Storage of reclaimed asphalt

Site selection：Choose good light protection、Dry and ventilated、Clean and tidy site for storage。The site shall be kept away from heat sources、Sources of ignition and flammable substances，To prevent the occurrence of fire accidents.。Regeneration after pretreatment screening（RAP）Materials shall be stacked neatly in layers in batches.，Avoid segregation，Partition walls shall be set between the material piles of different specifications for distinction.。Avoid long-term stacking，The stacking height shall not be greater than 3m，A canopy shall be built in the storage and preparation area to prevent rain.，To ensure the stability of its own water content。MillingRAPMaterial adoption“First come, first served.”Principle，And that wat content is ensured to be stable，Prevent the mixture from sticking due to long storage time。

In short，There are a series of steps and precautions to be followed for the recycling and storage of asphalt mixture recycled materials.，To ensure the efficiency of the recycling process and the safety of the storage process.。

The original creator：Shi Lei

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