Modified road asphalt based on waste tire rubber powder and preparation method thereof

Abstract

The invention discloses modified road asphalt based on waste tire rubber powder and a preparation method thereof. The invention belongs to the technical field of road asphalt preparation. The modifiedroad asphalt based on waste tire rubber powder comprises the following raw materials in parts by weight: 40-60 parts of waste tire rubber powder, 80-100 parts of matrix asphalt, 7-11 parts of hydrogen peroxide, 50-70 parts of distilled water and 7-11 parts of iron phosphate. According to the invention, the compatibility of the asphalt and the rubber powder is better and the viscosity of the modified rubber asphalt is reduced, so that the mixing, paving and grinding in practical application are facilitated, the softening point is increased, the high-temperature performance is facilitated, theneedle penetration is reduced, the ductility is increased, the low-temperature performance is facilitated, and the low-temperature construction is facilitated.

Description

technical field [0001] The invention relates to the technical field of road asphalt preparation, in particular to a modified road asphalt based on waste tire rubber powder and a preparation method thereof. Background technique [0002] With the rapid development of our country's economy, waste tires and waste plastics are increasing day by day, with an annual growth rate of more than 10%. The piles of waste tires not only have obvious pollution problems, but also have serious fire hazards. Therefore, Many large international companies, governments and local governments are urgently seeking solutions to the increasingly serious problem of waste tire disposal. Rubber asphalt is prepared from rubber asphalt prepared from waste tires, which is more durable and cheap than ordinary asphalt, and can Improve the high-temperature stability, low-temperature crack resistance, anti-aging and durability of asphalt, and can effectively reduce road noise, reduce road reflection, improve ro...

AI Technical Summary

Problems solved by technology

[0003] However, waste tire rubber powder modified asphalt still has problems such as storage stability, which is better than waste rubber powder, which is vulcanized rubber powder, which is difficult to swell and disperse directly in asphalt, so the storage stability of rubber powder modified asphalt is poor. Therefore, the key issue is how to disperse the waste rubber uniformly and stably in the asphalt. At present, there are technologies that use waste rubber powder and organic solvent or aromatic oil to stir at 150-300°C to degrade it, and then mix it with asphalt. Complex, high cost, and a large amount of organic solvents are used, causing certain pollution to the environment

[0004] The authorized publication number "CN103709769B" records "a method for preparing road asphalt, especially a method for preparing road asphalt from waste tires, which includes the following steps: waste tire rubber is recovered and processed, and ground into 15-300 mesh rubber powder Place the rubber powder in a stirrer, add 0.02%-1.0% catalyst, 0.5%-1.0% glycidyl methacrylate and 0.3%-0.5% diethylenetriamine, and stir at 50-80°C for 1 -3h, put the base asphalt into the mixer, heat it to 120-150°C, gradually add the modified rubber powder into the mixer, heat it to 170-180°C while stirring, and finally use the stirring speed of 2000-3000r / min Stir for 30-50 minutes; heat the above product at 120-150°C for 30-40 minutes to obtain the present invention. In the present invention, the surface of the rubber powder is modified with glycidyl methacrylate and diethylene triamine to increase the dispersion of the rubber powder. Uniformity and interfacial bonding force; the penetrability of the asphalt of the present invention is significantly lower than that of the base asphalt, the softening point is improved, and the low-temperature ductility is improved. Compared with the base asphalt oil, the modified asphalt has better stability and low-temperature crack resistance, and storage stability Significantly improved", the compatibility of asphalt and rubber powder in the above patents is not ideal, and its viscosity has become higher, resulting in unsatisfactory mixing, paving and rolling in practical applications

Images