Preparation method of direct-stirring type SBS (styrene-butadiene-styrene) asphalt modifier and preparation method of asphalt mixture

Abstract

The invention relates to a preparation method of a direct-stirring type SBS (styrene-butadiene-styrene) asphalt modifier and a preparation method of an asphalt mixture. The preparation method comprises the following steps of respectively metering 4303 star-shaped SBS, 1301 linear SBS and lubricating oil, feeding into a mixer according to a ratio, uniformly mixing, and uniformly stirring; feeding petroleum resin and calcium carbonate into the mixer, and uniformly stirring; feeding the mixture into a double-screw extruder, enabling the mixture to form a melting mixture at high temperature, and enabling the double-screw extruder to extrude the melting mixture after the forced shearing, extrusion, dispersing and kneading are continuously maintained; cooling the melting mixture extruded by thedouble-screw extruder by a water tank, enabling a pelletizer to cut into granules, enabling an air dryer to dry, and packaging. The preparation method has the advantages that the production technologyof the modified asphalt is simplified, the production quality of the mixture is favorably controlled, the construction quality of a road pavement is ensured, the use property of the road is improved,the service life of the road is prolonged, the pollution to the environment is decreased, and the engineering investment is reduced.

Description

technical field [0001] The invention belongs to the technical field of asphalt pavement construction, and relates to a preparation method and a construction process of an asphalt mixture, in particular to a preparation method of a direct mixing SBS asphalt modifier and a preparation method of the asphalt mixture. Background technique [0002] Affected by factors such as the rapid growth of modern road traffic flow, greatly increased axle loads of trucks, traffic channelization, and natural climate changes, road builders are concerned about the high-temperature anti-rutting ability, low-temperature anti-cracking ability, and water damage resistance of asphalt pavement. The requirements for fatigue damage ability have been further improved. It has become very common and necessary to reduce the temperature sensitivity of asphalt, increase the softening point of asphalt, reduce the embrittlement temperature of asphalt, and enhance the crack and wear resistance of asphalt pavement ...

AI Technical Summary

Problems solved by technology

[0003] At present, there are generally two production methods for modified asphalt: one is on-site production, and the modified equipment is docked with the asphalt mixing plant. The advantage of this process is that there is no worry about storage stability, and the production process is easy to monitor and control. Low, a mixing plant needs an on-site modification equipment

The second is commercial finished modified asphalt, which is also the most mainstream modified asphalt production method at present. The advantage of this method is that asphalt is mass-produced and the quality is relatively stable, but it is restricted by intermediate process conditions such as transportation and storage, and the production process It is a hidden link. When the correlation between the entry inspection index and the road performance is not good, the manufacturer often changes the production formula privately in order to reduce costs, resulting in invisible losses