China Plastics ›› 2025, Vol. 39 ›› Issue (8): 19-25.DOI: 10.19491/j.issn.1001-9278.2025.08.004

• Materials and Properties • Previous Articles     Next Articles

Study on durability of asphalt modified by HVA/modified montmorillonite/SBS high viscosity composites

LIU Lanbin1(), LIU Zhaowei2, SUN Jishu1(), GUO Yanfang3, PU Xiatian1   

  1. 1.School of Civil Engineering and Transportation,Hebei University of Technology,Tianjin 300401,China
    2.China Road and Bridge Engineering Co LTD,Beijing 100011,China
    3.Department of Transportation Engineering,Hebei University of Water Resources and Electric Engineering,Cangzhou 061001,China
  • Received:2024-09-22 Online:2025-08-26 Published:2025-07-30

Abstract:

In this study, a modified montmorillonite high⁃viscosity composite modified asphalt (GM⁃HVA) was developed by using self⁃modified montmorillonite, styrene⁃butadiene⁃styrene (SBS), and high⁃melting⁃point ethylene copolymer (HVA) to enhance the durability of asphalt. Through a series of comprehensive tests including viscosity⁃toughness analysis, short⁃term aging, multiple stress creep recovery, and thermal stability evaluation, GM⁃HVA was compared with conventional montmorillonite high⁃viscosity asphalt (M⁃HVA) and an imported modified asphalt containing 12 wt% TPS. Results indicated that GM⁃HVA exhibited superior thermal stability with higher viscosity, greater toughness, and significantly improved resistance to thermal oxidative aging and permanent deformation compared to M⁃HVA and the imported modified asphalt. Additional evaluation was carried out to evaluate the high⁃ and low⁃temperature stability and water damage resistance of asphalt samples through rutting tests, low⁃temperature bending tests, and immersion Marshall tests after both short⁃term and long⁃term aging. The results revealed that GM⁃HVA mixture presented the best anti⁃aging performance, and its high⁃ and low⁃temperature stability and water damage resistance were superior to the other two samples. These findings collectively demonstrate that GM⁃HVA offers superior durability compared to conventional high⁃viscosity modified asphalts.

Key words: high?viscosity composite modified asphalt, durability, montmorillonite, styrene?butadiene?styrene, high?melting?point ethylene copolymer

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