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<p>Sepiolite is a magnesium-rich silicate clay mineral characterized by a large specific surface area and numerous nanoscale channels, which make it a promising candidate for high-tech applications such as nanofiber reinforcement and catalysis. However, its utilization in road materials remains limited. This study investigated the application of natural sepiolite purified through acid treatment to enhance the performance of emulsified asphalt. Microscopic analyses, including Fourier transform infrared spectroscopy and laser particle sizing, confirmed that the acid treatment increased the specific surface area of the sepiolite fibers and refined their structure. Sepiolite fibers and styrene-butadiene rubber (SBR) were employed as modifiers to prepare a sepiolite/SBR composite-modified emulsified asphalt, optimized using a unified design approach. Performance tests demonstrated that the composite improved both high- and low-temperature performance, as well as the storage stability of conventional emulsified asphalt, resulting in a 30.7% increase in softening point, a 109% increase in energy of rupture, and a 62.9% decrease in 5-day storage stability. Fluorescence microscopy revealed that the compatibility between sepiolite and asphalt improved with the addition of SBR. Dynamic shear rheology confirmed the enhancement of high-temperature stability and resistance to deformation. The research findings provide a valuable reference for the application of sepiolite in road materials.</p>

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Study on preparation and properties of sepiolite/SBR composite modified emulsified asphalt

  • 期刊论文

  • 发表日期：

    2025年4月15日

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  • Gang Huang,
  • Yaru Lv,
  • Tianhao Qi,
  • Junbo Zhou,
  • Chao Zhou,
  • Xia Zhang,
  • Xin Tian,
  • Tingting Kang,
  • Tingjun Du

摘要

Sepiolite is a magnesium-rich silicate clay mineral characterized by a large specific surface area and numerous nanoscale channels, which make it a promising candidate for high-tech applications such as nanofiber reinforcement and catalysis. However, its utilization in road materials remains limited. This study investigated the application of natural sepiolite purified through acid treatment to enhance the performance of emulsified asphalt. Microscopic analyses, including Fourier transform infrared spectroscopy and laser particle sizing, confirmed that the acid treatment increased the specific surface area of the sepiolite fibers and refined their structure. Sepiolite fibers and styrene-butadiene rubber (SBR) were employed as modifiers to prepare a sepiolite/SBR composite-modified emulsified asphalt, optimized using a unified design approach. Performance tests demonstrated that the composite improved both high- and low-temperature performance, as well as the storage stability of conventional emulsified asphalt, resulting in a 30.7% increase in softening point, a 109% increase in energy of rupture, and a 62.9% decrease in 5-day storage stability. Fluorescence microscopy revealed that the compatibility between sepiolite and asphalt improved with the addition of SBR. Dynamic shear rheology confirmed the enhancement of high-temperature stability and resistance to deformation. The research findings provide a valuable reference for the application of sepiolite in road materials.