The design service life of asphalt pavement has different standards according to different kilometer grades, and the service life of asphalt concrete pavement is directly related to the road grade, traffic volume, and road construction. The design life of general highways is 15 years; 12 years for second-class highway; 10 years for third-class highway; 8 years for fourth-class highway. And every year, about 10% of the road surface enters the major and medium maintenance period, resulting in a large amount of old asphalt mixture. In order to reduce resource waste, these old asphalt mixtures can be recycled and reused, which not only saves resources but also reduces a lot of expenses. How to choose asphalt crushing equipment? What does crushing and screening equipment include?
Regarding Reuse
If you want to reuse old asphalt mixture, you need to use asphalt crushing equipment to crush the old asphalt, mix it with rejuvenator, new asphalt, new aggregate, etc. in a certain proportion to form a new asphalt mixture that meets certain road performance and is re paved with the road surface.
Aging of asphalt
During the use of asphalt, due to the effects of sunlight, air, and other factors, as well as the physical and chemical interactions between asphalt and mineral aggregates, asphalt molecules undergo oxidation and polymerization, transforming low molecular weight compounds into higher molecular weight compounds, resulting in deterioration of road performance and aging of asphalt. After the aging of asphalt, the internal substances of asphalt change, with a decrease in penetration, a decrease in ductility, an increase in softening point, an increase in absolute viscosity, and a decrease in brittle point, which is not conducive to vehicle traffic. In order to prevent traffic accidents, it is necessary to renovate or repair the asphalt concrete pavement after a period of time. The current processing technology is to use milling machines to mill off a layer of asphalt concrete pavement, and then spread new asphalt concrete to repair or improve the original pavement. Suhe Machinery specializes in the production of asphalt mixture crushing equipment and milling material crushing and screening equipment.
What does the crushing and screening equipment include?
The crushing and screening equipment includes a primary crusher, a vibrating screen, a feeding belt conveyor used to transport the output of the primary crusher to the vibrating screen, a secondary crusher connected to the end of the upper screen of the vibrating screen, a return conveying device used to transport the output of the secondary crusher to the feeding belt conveyor, and a discharge conveying device used to transport the output of the vibrating screen to the silo. Furthermore, the discharge conveying device comprises a discharge belt conveyor and a second discharge belt conveyor for conveying the two graded discharges of the vibrating screen to the silo, both of which adopt a foldable structure.
