Resource application of waste tire rubber powder modified asphalt
Used tires are called "black pollution", and their recycling and disposal technology has been a worldwide problem. This article makes an investigation and analysis of the current status of waste tire recycling at home and abroad, and describes in detail the application of waste tire rubber powder modified asphalt on highways. And compared with matrix asphalt and SBS modified asphalt in terms of process flow, economic benefits, highway performance, etc. It is concluded that the application of waste tire rubber powder modified asphalt has important strategic significance for China's economic development.
Rubber asphalt refers to a kind of bonding material prepared by adding not less than 15% of waste tire rubber powder to the asphalt, and after a long time (not less than 45min) stirring at a temperature of not less than 200 ° C. . The modification process is a physical modification process. The production process of rubber to asphalt:
The performance of rubber powder modified asphalt is superior, and the penetration, softening point and ductility meet the requirements of the index. Penetration can reflect the softness and hardness of the asphalt. The smaller the penetration, the harder the asphalt. It is not easy to soften under high temperature in summer. It is suitable for southern areas. Easy to crack, suitable for use in northern areas.
The softening point reflects the temperature at which the asphalt softens. At high temperatures in summer, the temperature of the pavement will be very high due to the heat absorption of the asphalt, and some will exceed 60 ° C. The softening point of ordinary asphalt is low, and the asphalt is easy to soften, while the softening point of rubber powder modified asphalt is high, such problems will not occur .
Rubber powder modified asphalt highway has advantages over matrix asphalt and SBS modified asphalt in terms of noise reduction, high temperature anti-softening, and low temperature anti-cracking. The cost and price of rubber powder modified asphalt is higher than that of matrix asphalt, but the maintenance period is nearly half longer than that of matrix asphalt, and the maintenance cost of rubber powder modified asphalt is lower than that of matrix asphalt.
The use of rubber powder modified asphalt can replace 20% -33% of petroleum resources, while matrix asphalt and SBS modified asphalt cannot.
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