A kind of SBS modified asphalt and preparation method thereof

Abstract

The invention discloses a SBS modified asphalt, which is prepared from the following raw materials in parts by weight: 100 parts of base asphalt, 2.0-3.5 parts of SBS asphalt modifier, 1-2 parts of RET asphalt modifier, and 0.2-3 parts of polyphosphoric acid 0.5 parts, compatibilizer 3-4 parts, stabilizer 0.1-0.15 parts. In addition, the invention also discloses a method for preparing the SBS modified asphalt. The method is as follows: 1. After heating the base asphalt, add a compatibilizer and stir evenly to obtain a mixed material; 2. Add an SBS asphalt modifier to the mixed material Stir evenly with RET asphalt modifier, add stabilizer after shearing and continue shearing, then add polyphosphoric acid and stir evenly to obtain SBS modified asphalt. The SBS modified asphalt of the invention is a chemically stable SBS modified asphalt, which has good high-temperature performance and anti-rutting performance, and its thermal stability is better than that of traditional SBS modified asphalt.

Description

technical field [0001] The invention belongs to the technical field of road building materials, and in particular relates to a SBS modified asphalt and a preparation method thereof. Background technique [0002] At present, the most commonly used traditional SBS modified asphalt can significantly improve the high temperature, low temperature, fatigue and aging resistance of asphalt, and can comprehensively improve the performance of asphalt. Therefore, it is the most widely used in the world. Its modification process, construction The process and quality control are also very mature. Nevertheless, there are still many problems in the actual engineering of traditional SBS modified asphalt. The first is the cost problem. The price of SBS asphalt modifier is relatively high, and its dosage must reach a certain level to have a better modification effect. ;Secondly, the requirements for modification equipment and modification process are relatively high, which is mainly manifest...

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Problems solved by technology

Nevertheless, there are still many problems in the actual engineering of traditional SBS modified asphalt. The first is the cost problem. The price of SBS asphalt modifier is relatively high, and its dosage must reach a certain level to have a better modification effect. ;Secondly, the requirements for modification equipment and modification process are relatively high, which is mainly manifested in the core equipment - colloid mill. In the past few years, China was unable to produce colloid mill that meets the requirements. This equipment can only be imported from abroad. The monopoly of large manufacturers has led to not only high equipment prices, but also a big problem in later equipment maintenance; at present, although China has been able to produce colloid mills with better performance, there are many varieties in the market, good and bad are uneven, and there are differences between equipment from different manufacturers. There are not small differences, resulting in different modification processes, which greatly affect the production quality of modified asphalt; as for the industrial batch production of polymer modified asphalt, this method can better ensure the quality of asphalt, but in actual engineering Among them, the distance between the construction site and the factory is relatively far, and the modified asphalt needs to be transported by special vehicles for long-distance transportation to the site, which will undoubtedly increase the cost of road construction

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