Production technology of activation and oxidation double-modified scrap tire rubber powder modified asphalt

Abstract

The invention discloses a production technology of activation and oxidation double-modified scrap tire rubber powder modified asphalt. According to the production technology, low temperature plasma activation is carried out on desulfurated scrap tire rubber powder, the obtained rubber powder is then sequentially treated by etching and surface oxidation, and the scrap tire rubber powder modified asphalt is prepared by adopting a wet process under the action of a high speed shearing machine. After the rubber powder is subjected to low temperature plasma activation, the specific surface area of the rubber powder is enlarged, so that the effective contact area between the rubber powder and asphalt is increased, and the rubber powder is promoted to be blended with the asphalt; on the other hand, oxygen containing functional groups can be introduced, the contents of -OH groups and C=C double bonds in the rubber powder are increased, and surface oxidation treatment is then carried out, so that the content of active groups on the surface of the rubber powder is further increased, the compatibility of the rubber powder and the asphalt is improved, the softening point of the modified asphalt is obviously increased, and the pavement performance of the modified asphalt is greatly improved.

Description

technical field [0001] The invention relates to a preparation method of an asphalt pavement material, in particular to a production process of double-modified waste tire rubber powder modified asphalt by activation and oxidation. Background technique [0002] Asphalt pavement is the main pavement structure form of highways and urban roads in our country. With the rapid development of the national economy, the traffic density and heavy vehicles are increasing day by day, so that the asphalt pavement is severely tested. From the perspective of economy and environmental protection, research work on the use of waste tire rubber powder to modify asphalt for road construction has been carried out at home and abroad. , has the advantages of stronger anti-aging, anti-fatigue, reduced noise, increased friction, etc., and also has the characteristics of low-temperature crack resistance, high-temperature stability, and durability. [0003] However, the rubber molecular chains in the v...

AI Technical Summary

Problems solved by technology

[0003] However, the rubber molecular chains in the vulcanized rubber powder have been cross-linked into a network structure, which has poor fluidity, low surface activity, poor processability, and poor compatibility with the base asphalt, which makes the rubber powder easy to precipitate and segregate in the asphalt, directly affecting its performance. Properties of Modified Asphalt and Its Application in Road Construction