Modern highways and roads have undergone many changes: traffic flow and driving frequency have increased dramatically, the axle load of freight trucks has continued to increase, and lane-dividing and one-way driving are generally implemented, requiring further improvement of road surface flow resistance, that is, high temperature Improve the ability to resist rutting; improve flexibility and elasticity, that is, the ability to resist cracking at low temperatures; improve wear resistance and extend service life. Modern buildings generally use long-span prestressed roof panels, which require roof waterproofing materials to adapt to large displacements, be more resistant to harsh high and low temperature climate conditions, have better durability, have self-adhesiveness, facilitate construction, and reduce maintenance workload. These changes in the use environment pose severe challenges to the performance of petroleum asphalt. Modification of petroleum asphalt to adapt to the above-mentioned harsh usage requirements has attracted people's attention. After decades of research and development, a wide variety of modified road asphalt, waterproof membranes and coatings have emerged, showing certain practical engineering effects. However, given that the price of modified asphalt is usually 2 to 7 times higher than that of ordinary petroleum asphalt, users have not yet fully grasped the engineering performance of the material, and the output of modified asphalt has grown slowly. At present, modified road asphalt is mainly used for paving applications in special occasions such as airport runways, waterproof bridge decks, parking lots, sports fields, heavy traffic pavements, intersections and road turns. Recently, modified asphalt has been applied to the maintenance and reinforcement of road networks in Europe, which has greatly promoted the widespread application of modified road asphalt. Modified asphalt waterproofing membranes and coatings are mainly used in waterproofing projects for high-end buildings. With the advancement of science and technology and the development of economic construction, the variety development and production technology of modified asphalt will be further promoted. The variety and preparation technology of modified asphalt depend on the type and amount of modifier and the composition and properties of the base asphalt (i.e. raw asphalt). Due to the wide variety of modifiers with different forms, in order to form a uniform material with petroleum asphalt that can be used for engineering applications, various types of modifiers have been evaluated over the years and corresponding formulas and preparation methods have been developed. However, most The modified asphalt that has been put into practical use is a patented technology and patented product. I don’t know which kind of ordinary modified asphalt you are referring to. Road modified asphalt and waterproof modified asphalt are different, and there are many subdivided varieties.