What is Plant Mixed Asphalt Pavement Recycling Technology

As a kind of asphalt recycling technology, plant mixed hot recycling technology rose in Europe and America in the 1980s, and has developed rapidly in the past 20 years. Many experiments show that the performance of plant mixed hot recycled asphalt mixture is comparable to that of asphalt mixture processed with pure original materials, and even better than that of original asphalt concrete in terms of individual indicators. It is not only used to repair the upper, middle and lower layers of asphalt pavement, but also to strengthen the base and subgrade. It can not only repair the functional damaged pavement, but also correct the structural damage of the pavement.

Overview of Plant Mixed Asphalt Pavement Recycling Technology

According to different mixing and construction temperature of recycled mixture, asphalt pavement recycling technology can be divided into hot recycling and cold recycling; According to different construction sites and processes, it can be divided into plant mixed recycling and in-situ recycling. The plant mixed hot recycling technology is a technology that the recycled asphalt pavement materials are transported to the asphalt mixing plant (you can learn more asphalt mix equipment through the recommended website), and then mixed with new aggregate, new asphalt and recycling agent (if necessary) in a certain proportion to make hot mixed recycled mixture to pave the pavement. And the asphalt mixing plant just mentioned above is the recycled asphalt mixing equipment.

Classification of Hot Recycling Technology of Plant Mixed Asphalt

The plant mixed hot recycling technology needs to transport the old materials (RAP) removed from the pavement back to the mixing plant, and then re-add them to the asphalt concrete through a series of processes such as crushing, storage and addition. According to the addition method, it can be divided into cold addition method and hot addition method.

Cold addition is directly added by mixing cylinder. The advantages of this method are less equipment investment, simple and reliable. If the asphalt foam device is installed, it can also be used to produce warm mixed asphalt or small batch of cold mixed materials. Its limitation is that the primary aggregate needs to be heated to a very high temperature to compensate for the temperature loss caused by the addition of recycled materials. Therefore, the addition ratio is small, basically between 15% and 40%. Another disadvantage of this method is that the mixing time is long, which affects the equipment output.

The hot addition needs to heat the recycled material through parallel drums. The recovered material is heated in the parallel drum, heated to about 120-140 ℃, and then added to the mixing tank through the weighing scale. This technology can greatly increase the amount of recycled materials, up to 70%. At the same time, it can be combined with the addition of cold recycling, which brings more choices to customers. Its disadvantages are complex equipment and high investment amount.