Waste rubber tires are the most important among waste rubber. Every year, hundreds of millions of waste tires are produced in China. Some of them are processed into tire rubber powder, which is used in the rubber industry and non-rubber industry. The use of a certain proportion of tire rubber powder modification can improve the road surface fatigue resistance, durability, crack resistance, wet skid resistance, etc.; the asphalt pavement using tire rubber powder has the above advantages, and tire rubber powder The ingredients in the group are directly related.
Tire rubber powder processed from waste tires is complex, mainly including natural rubber, synthetic rubber, sulfur, carbon black, anti-aging agents, etc. These components play an important role in asphalt pavement 1JLYY816.
There are three main raw materials for rubber tire tires, natural rubber, synthetic rubber (styrene-butadiene rubber, butadiene rubber) and carbon black. Generally, the amount of natural rubber in automobile tires accounts for about 25%-40 of the total mass of the formula, so the waste tires The processed tire rubber powder contains a certain amount of natural rubber, which can obviously improve the elasticity, softening point and low-temperature fluidity of the rubber asphalt, and impart reversible elastic deformation to the asphalt pavement.
Natural rubber has poor aging resistance. It will become soft and sticky after aging, while asphalt will become hard and brittle when aged. The natural rubber contained in the tire rubber powder will be able to replenish the soft components lost after aging of the asphalt. Performance, to a certain extent extend the service life of asphalt pavement. The styrene-butadiene rubber and butadiene rubber contained in the waste tire rubber powder can further improve the cold resistance, heat resistance, wear resistance and elasticity of the asphalt pavement.
2. Reinforcing carbon black
Carbon black is the most suitable compounding agent for rubber tires except for rubber. In the tire casing, the physical and mechanical strength of the tire casing can be significantly improved. Waste tire rubber powder is used in the modification of asphalt pavement. The carbon black component can effectively improve the adhesion, durability, wear resistance of asphalt and the anti-rutting performance of asphalt mixture.
Sulfur is the traditional vulcanizing agent in the production of rubber products. The most commonly used vulcanizing agent in rubber tire casings. The sulfurized vulcanized rubber cross-linking network is in a stable state and is no longer so sensitive to external temperature changes. Therefore, waste tire rubber powder contains Sulfur can improve the temperature stability of asphalt pavement to some extent.
4. Anti-aging agent
The anti-aging agents commonly used in the production of rubber tires include anti-aging agent RD, anti-aging agent H, anti-aging agent 4010, anti-aging agent 4010NA, anti-aging agent 4020, anti-aging agent D, protective wax, etc. These components are not processed during the processing of waste tire rubber powder. Completely removed, the rubber powder itself has good resistance to thermal aging, flex cracking, etc.; therefore, when using tire rubber powder in asphalt pavement, the antioxidant component in the rubber powder can also improve the asphalt to some extent. Anti-aging properties of pavement.
At present, with the continuous development and progress of waste tire rubber powder technology, more fractions of tire rubber powder are used in asphalt pavement laying. What good opinions and suggestions do you have for this? Later, Xiaobian has the opportunity to continue to share the mechanism of action of tire rubber powder on asphalt pavement.