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<p>The underlined study focusses on investigating the rheological properties of bitumen binders VG-30 and bituminous mastic modified with hydrophilic nanoclay (NC). Varied dosages (0%, 2%, 4%, 6%, and 8% by weight of bitumen) of NC were blended with VG-30 using a high shear mixer (HSM). Various performance assessments, including high temperature performance grading (PG), Multiple Stress Creep Recovery (MSCR), frequency sweep, along with scanning electron microscopy (SEM), were conducted. SEM micrographs show that the agglomeration problem arises beyond 6% of NC addition at the binder scale. High PG results indicate that the PG grade of binder reaches 76 from 70, while that of mastic goes as high as 82. Frequency sweep test results show that complex shear modulus (G*) and shift phase angle (δ) improve at both scales; however, the improvement is more pronounced at the mastic scale. Further, the result of MSCR tests show that incorporation of NC leads to enhanced rutting resistance for binders and mastic; however, rutting resistance deteriorated at the binder scale beyond 6% NC. The difference in enhancement for different rheological parameters shows that nanoclay modification works better at the mastic scale.</p>

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High-Temperature Performance Evaluation of Hydrophilic Nanoclay Modified Binder and Mastic: A Comparative Study

  • 期刊论文

  • 发表日期：

    2026年6月29日

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  • Hazratullah Paktin,
  • Kumar Molugaram,
  • Siksha Swaroopa Kar,
  • V. Vinayaka Ram

摘要

The underlined study focusses on investigating the rheological properties of bitumen binders VG-30 and bituminous mastic modified with hydrophilic nanoclay (NC). Varied dosages (0%, 2%, 4%, 6%, and 8% by weight of bitumen) of NC were blended with VG-30 using a high shear mixer (HSM). Various performance assessments, including high temperature performance grading (PG), Multiple Stress Creep Recovery (MSCR), frequency sweep, along with scanning electron microscopy (SEM), were conducted. SEM micrographs show that the agglomeration problem arises beyond 6% of NC addition at the binder scale. High PG results indicate that the PG grade of binder reaches 76 from 70, while that of mastic goes as high as 82. Frequency sweep test results show that complex shear modulus (G*) and shift phase angle (δ) improve at both scales; however, the improvement is more pronounced at the mastic scale. Further, the result of MSCR tests show that incorporation of NC leads to enhanced rutting resistance for binders and mastic; however, rutting resistance deteriorated at the binder scale beyond 6% NC. The difference in enhancement for different rheological parameters shows that nanoclay modification works better at the mastic scale.