Surface Oxidation Mechanism of Crumb Rubber and Its Effect on Storage Stability of Crumb Rubber-Modified Asphalt

Abstract

Abstract: In order to enhance the surface activity of crumb rubber and improve the storage stability of crumb rubber-modified asphalt, H₂O₂ and NaClO solutions were used to oxidize waste crumb rubber powder and the catalytic effect of FeSO₄·7H₂O on the oxidation process of H₂O₂ solution was investigated. The microstructures of crumb rubber before and after oxidation were studied by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). The storage stability of crumb rubber-modified asphalt was characterized by 48 h segregation test. The results show that the surface active oxygen-containing groups of crumb rubber increase and the microstructures change under the action of two oxidants. The main elements of the powder before and after oxidation are C, O and S. The relative content of O on the surface of oxidized crumb rubber increases significantly. Besides, the storage stability of crumb rubber-modified asphalt oxidized by H₂O₂-FeSO₄ solution is significantly improved, which meets the requirements of polymer-modified asphalt in China.

Key words: oxidation treatment, crumb rubber, NaClO, H₂O₂, microstructure, crumb rubber-modified asphalt, storage stability

CLC Number:

U414

CHENG Yong, LIU Yumei, JU Jian, ZHENG Mulian, PAN Xifeng, ZHU Yueming. Surface Oxidation Mechanism of Crumb Rubber and Its Effect on Storage Stability of Crumb Rubber-Modified Asphalt[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(12): 4178-4186.

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