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<p>This study introduces a novel method to analyze how fillers disperse in bituminous binders. A custom-designed laboratory setup enables precise temperature control (140&#xa0;°C) and mixing speeds (200, 800, 1500&#xa0;rpm) for small-scale mixtures (5% filler) over 5, 15 and 30&#xa0;min. To assess dispersion, microscopy-based visualization approach using optical microscopy (10× objective) and image analysis (ImageJ). Each particle is segmented and its projected area converted into an equivalent diameter, yielding a surface-fraction distribution (in logarithmic size bins). We evaluate the D<sub>50</sub> (Area50) position and the 50–100% range to detect coarse aggregates or over-shearing. The interest of the method is illustrated by comparing how limestone (CaCO<sub>2</sub>) and quartz (SiO<sub>2</sub>) fillers disperse in two different bitumens: naphthenic and paraffinic. Results indicate that quartz disperses more readily, quickly approaching a near-homogeneous state, whereas limestone requires higher shear and longer mixing times to approach the reference filler. Paraffinic bitumen shows a higher initial fine‑particle fraction; nonetheless, the naphthenic binder de‑agglomerates faster and ultimately matches, or slightly surpasses, the paraffinic dispersion. Mixing at 1500&#xa0;rpm can fracture particles, skewing the size profile. The protocol delivers ± 1% repeatability across replicates, providing a robust tool for optimising mastic formulation and enhancing pavement durability.</p>

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Development of a new method to quantify filler dispersion in bituminous mastics by transmission microscopy and image analysis

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年10月6日

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  • Marouane Ouazri,
  • Walid Maherzi,
  • Didier Lesueur,
  • Lahcen Khouchaf

摘要

This study introduces a novel method to analyze how fillers disperse in bituminous binders. A custom-designed laboratory setup enables precise temperature control (140 °C) and mixing speeds (200, 800, 1500 rpm) for small-scale mixtures (5% filler) over 5, 15 and 30 min. To assess dispersion, microscopy-based visualization approach using optical microscopy (10× objective) and image analysis (ImageJ). Each particle is segmented and its projected area converted into an equivalent diameter, yielding a surface-fraction distribution (in logarithmic size bins). We evaluate the D50 (Area50) position and the 50–100% range to detect coarse aggregates or over-shearing. The interest of the method is illustrated by comparing how limestone (CaCO2) and quartz (SiO2) fillers disperse in two different bitumens: naphthenic and paraffinic. Results indicate that quartz disperses more readily, quickly approaching a near-homogeneous state, whereas limestone requires higher shear and longer mixing times to approach the reference filler. Paraffinic bitumen shows a higher initial fine‑particle fraction; nonetheless, the naphthenic binder de‑agglomerates faster and ultimately matches, or slightly surpasses, the paraffinic dispersion. Mixing at 1500 rpm can fracture particles, skewing the size profile. The protocol delivers ± 1% repeatability across replicates, providing a robust tool for optimising mastic formulation and enhancing pavement durability.