| In recent years, a large number of highways have gone into a large, repair period which will produce large amounts of waste asphalt concrete. In order to protect the environment and conserve resources, recycling of asphalt concrete has been a new subject. Therefore, the asphalt pavement recycling technology has become an urgent problem to be solved.According to the comprehensive development at home and abroad, we can understand the development of recycling technology of asphalt concrete situation. Combining with the use of the road environment, we can select the appropriate renewable technologies.Performance on the road surface analysis was used to assess the damage road surface conditions, road ride quality, pavement skid resistance, pavement bearing capacity. Analysis of the mechanism of surface damage, in particular the formation of ruts on the road, causes the fundamental characteristics and deformation analysis are required. And on this basis, we can calculate the pavement rutting according to the multi-layered theory t.As to the pavement which can no longer meet the requirements for the road, we should improve or reconstruct it, and we need to have structural design and materials design for the recycling asphalt pavement. Firstly, we should converse the axle load, which is to turn the different types of vehicles converted to standard axle load axle load. Then, according to the result of the calculation, we can design the combination of the pavement structure and the composition of the pavement materials. In order to make the pavement structure and materials be compatible and unified in terms of performance, we need to make the pavement structure and material design a unity. So that the life of the road can be significantly improved and the function can be good with the cost of asphalt concrete pavement is essentially the same in the construction.According to the current process and technical conditions for the regeneration of the old asphalt, there are two kinds of means:heat regeneration and cold recycling technology.There are two hot-site renewable technologies:on-site thermal renewable technology and factory-hot mixed renewable technology. On-site thermal renewable technology is also known as surface heat regeneration technology. It is through on-site heating, plowing, mixing, paving, rolling and other processes, and achieve local regeneration of the old asphalt pavement once; factory-hot mixed renewable technology is to dig out the old asphalt pavement first and then send back to the factory, and then crush and screen them, and incorporate a number of new aggregates asphalt and recycling agent for mixing according to the content of the old asphalt, asphalt aging, gravel, grading and other indicators. So that the mixture reaches the target specification, then re-pave the toad in accordance with exactly the same way ordinary asphalt road is paved.Cold renewable technology can also be divided into on-site cold mix recycling technology and factory cold recycling technology. On-site cold recycling is to use the site-specific recycling machine, turning the original pavement mix, recycling and re-paving of the asphalt pavement recycling technology, it is used to repair various roads disease and the former asphalt concrete are mainly used for road base or sub base. Ship the old asphalt concrete pavement materials back to stable and crush them as aggregate, then add cement or lime, fly ash, emulsified asphalt,and so on.We can add one or more stabilizers and new material (if necessary) for mixing, and then pave the grass roots or sub-base. |
