China Plastics ›› 2025, Vol. 39 ›› Issue (1): 13-18.DOI: 10.19491/j.issn.1001-9278.2025.01.003

• Materials and Properties • Previous Articles     Next Articles

Performance and mechanism of desulfurization crumb rubber/SBS⁃modified asphalt

XU Qiangxiang1(), ZHANG Guoping2, HU Yihong3, YANG Fayong4, ZHAO Qiongyang5,6, LI Zhigang5,6   

  1. 1.Xicheng Engineering Design Group Co,Ltd,Lijiang 310015,China
    2.Yulin City Yuyang District Rural Road Maintenance Center,Yulin 719000,China
    3.Hunan Highway Maintenance Engineering Co,Ltd,Changsha 410000,China
    4.Xi'an Highway Research Institute Co,Ltd,Xi′an 710061,China
    5.School of Architecture and Civil Engineering,Xi′an University of Science and Technology,Xi′an 710054,China
    6.Road Engineering Research Center of Xi'an University of Science and Technology,Xi′an 710054,China
  • Received:2024-04-07 Online:2025-01-26 Published:2025-02-14

Abstract:

Aiming to address the phenomenon of high prices of commonly used styrene⁃butadiene⁃styrene (SBS)⁃modified asphalt at present, this work focuses on a reduction in the engineering cost of SBS⁃modified asphalt. The basic performance, storage stability, anti⁃aging performance of the desulfurization crumb rubber (DCR)/SBS⁃modified asphalt was studied with the purpose of improving the asphalt performance and enhancing the effective recycling of waste crumb rubber. Scanning electron microscopy and the Fourier⁃transform infrared spectroscopy were conducted to analyze and evaluate the morphological characteristics and chemical properties of the modified asphalt. The results indicated that the addition of SBS and desulfurized crumb rubber improved the high⁃ and low⁃temperature performance, storage stability, and anti⁃aging performance of the modified. The desulfurized crumb rubber and SBS as modifiers were uniformly dispersed in the asphalt matrix and crosslinked with each other. The interface at the desulfurized crumb rubber⁃SBS⁃asphalt three phases was fuzzy. Desulfurized crumb rubber and SBS were coexisting in asphalt through the physical modification and chemical reaction. This study provides a technical reference for further popularization and application by using waste crumb rubber to partly replace the SBS modifier in the road project.

Key words: road engineering, desulfurization crumb rubber, SBS modified asphalt, composite modification, rheological properties, modification mechanism

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