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<p>Mineral fillers (Hydrated lime &amp; Quarry dust) play a major role in improving the performance of the mastic. The interaction with bitumen, the aging kinetics of the mastic, and the resulting rheological behavior are primarily controlled by the filler dosage and its physicochemical interaction. This study investigates the impact of different dosages of hydrated lime (HL) and Quarry dust (QD) on unaged and aged bituminous mastic. FTIR spectroscopy was used to evaluate the functionalities present in mastic and thereby understand the interaction effects and aging kinetics. The frequency sweep test was conducted in the temperature range of 30 to 80&#xa0;°C to evaluate the viscoelastic properties of the mastic. The findings show that the presence of hydroxyl, aliphatics and carbonyl in hydrated lime mastic (HLM) increased the absolute shear modulus of the mastic up to 30%. For 40% HL, the reduction of the aliphatic index due to the scission of the carbon chain resulted in a reduced modulus. HL also assisted in reduced aging of mastic after 50 hours of aging. For QDM only a small improvement in modulus was observed and the phase angle of QDM is found to be dosage-independent. The aging compounds were also higher for QDM resulting in a corresponding increase in absolute shear modulus. To decide the proportion of the filler in the mix, it is important to consider the filler type and its interaction with the bitumen in addition to the density required from particle packing.</p>

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Influence of mineral fillers on rheological and aging characteristics in bituminous mastic

  • 期刊论文

  • 发表日期：

    2026年3月24日

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  • K. L. A. V. Harnadh,
  • A. Padmarekha,
  • M. R. Nivitha,
  • S. Karuppasamy

摘要

Mineral fillers (Hydrated lime & Quarry dust) play a major role in improving the performance of the mastic. The interaction with bitumen, the aging kinetics of the mastic, and the resulting rheological behavior are primarily controlled by the filler dosage and its physicochemical interaction. This study investigates the impact of different dosages of hydrated lime (HL) and Quarry dust (QD) on unaged and aged bituminous mastic. FTIR spectroscopy was used to evaluate the functionalities present in mastic and thereby understand the interaction effects and aging kinetics. The frequency sweep test was conducted in the temperature range of 30 to 80 °C to evaluate the viscoelastic properties of the mastic. The findings show that the presence of hydroxyl, aliphatics and carbonyl in hydrated lime mastic (HLM) increased the absolute shear modulus of the mastic up to 30%. For 40% HL, the reduction of the aliphatic index due to the scission of the carbon chain resulted in a reduced modulus. HL also assisted in reduced aging of mastic after 50 hours of aging. For QDM only a small improvement in modulus was observed and the phase angle of QDM is found to be dosage-independent. The aging compounds were also higher for QDM resulting in a corresponding increase in absolute shear modulus. To decide the proportion of the filler in the mix, it is important to consider the filler type and its interaction with the bitumen in addition to the density required from particle packing.