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<p>Terminal blend rubberized asphalt (TBRA) is commonly produced at a temperature over 250°C, which is energy consuming and might bring safety issues during production. The present study aims to develop chemically activated rubberized asphalt (CARA) binder at lower production temperature through the use of chemical additive. An optical microscope was selected to investigate the evolution and distribution of rubber particles inside CARA. Brookfield viscometer, dynamic shear rheometer (DSR), multiple stress creep recovery (MSCR) test and bending beam rheometer (BBR) were used to analyze the rheological properties of CARA and TBRA at varying temperatures. With the rise of chemical additive content, rubber particle size is gradually reduced from 50&#xa0;μm to 20&#xa0;μm, and the BBR derived low temperature relaxation parameter <i>m</i>-value of CARA is increased from 0.37 to 0.42 at -12&#xa0;°C. The optimal content of chemical additive is determined as 0.2% by weight of CARA containing 20% crumb rubber. The viscosity of CARA containing 20% crumb rubber is lower than 3.0&#xa0;Pa·s at 135&#xa0;°C. When the crumb rubber content is further increased to 30% and 40%, the viscosity at 135&#xa0;°C reaches to twice and quadruple of CARA containing 20% crumb rubber, which brings poor workability. Compared with TBRA binders, CARA reduces the production temperature by 60&#xa0;°C and further improves the low temperature performance, which is energy saving and more practical for industrial production.</p>

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Microscopic and Rheological Investigation of Chemically Activated Rubberized Asphalt

  • 期刊论文

  • 发表日期：

    2025年5月14日

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  • Feng Liang,
  • Chenyang Xue,
  • Songtao Wang,
  • Naipeng Tang,
  • Fuquan Shi,
  • Yingjiao Chen,
  • Guohua Gao

摘要

Terminal blend rubberized asphalt (TBRA) is commonly produced at a temperature over 250°C, which is energy consuming and might bring safety issues during production. The present study aims to develop chemically activated rubberized asphalt (CARA) binder at lower production temperature through the use of chemical additive. An optical microscope was selected to investigate the evolution and distribution of rubber particles inside CARA. Brookfield viscometer, dynamic shear rheometer (DSR), multiple stress creep recovery (MSCR) test and bending beam rheometer (BBR) were used to analyze the rheological properties of CARA and TBRA at varying temperatures. With the rise of chemical additive content, rubber particle size is gradually reduced from 50 μm to 20 μm, and the BBR derived low temperature relaxation parameter m-value of CARA is increased from 0.37 to 0.42 at -12 °C. The optimal content of chemical additive is determined as 0.2% by weight of CARA containing 20% crumb rubber. The viscosity of CARA containing 20% crumb rubber is lower than 3.0 Pa·s at 135 °C. When the crumb rubber content is further increased to 30% and 40%, the viscosity at 135 °C reaches to twice and quadruple of CARA containing 20% crumb rubber, which brings poor workability. Compared with TBRA binders, CARA reduces the production temperature by 60 °C and further improves the low temperature performance, which is energy saving and more practical for industrial production.