Material and Manufacturing Technologies:

Linking waste rubber powder and its application in asphalt

Accordance with recent researches rubber powder shows high activity of surface after graft adjustment. It was shown that Interfacial bonding between modified rubber powder and asphalt can be enhanced. For his purpose, rubber asphalt was improved to modify its universal performance and the mechanism of its modification was examined. Unmodified rubber powder was treated with hydrogen peroxide, and after that, grafted with prepolymer.

Accordance with recent researches rubber powder shows high activity of surface after graft adjustment. It was shown that Interfacial bonding between modified rubber powder and asphalt can be enhanced. For his purpose, rubber asphalt was improved to modify its universal performance and the mechanism of its modification was examined. Unmodified rubber powder was treated with hydrogen peroxide, and after that, grafted with prepolymer.

Based on these studies, road efficiency and durability of improved rubber powder/ asphalt was obviously improved. The usage of modified rubber powder in asphalt can supplies a possible method for the access of waste rubber. The modification mechanism of rubber powder and its impact on the structure and properties of rubber powder/asphalts were investigated and characterized. Fourier transform infrared spectroscopy analysis demonstrated that prepolymer was successfully grafted onto the surface of rubber particles. X-ray photoelectron spectrometer test showed that graft modified rubber powder possessed high oxygen content along with the presence of nitrogen.

These results demonstrated that rubber powder can be successfully improved. The graft modified rubber powder was then used to provide rubber asphalt, significantly modifying the low-temperature resistance to cracking and the stability performance, while it reduced high-temperature construction viscosity of rubber asphalt.

The modification of rubber powder enhanced the dispersion of rubber powder in asphalt. The graft modified rubber powder/asphalt showed the highest level of weight fraction of limited molecular layers, indicating the improved interfacial interplay between the links improved rubber powder and asphalt matrix, which could be credited to the concurrent effect of physical involvement and chemical bonding impact.

Source:

https://www.sciencedirect.com/science/article/abs/pii/S095006182033885X

https://www.sciencedirect.com/science/article/abs/pii/S0950061819331903

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