Research Article
High- and Low-Temperature Properties and Thermal Stability of Silica Fume/SBS Composite-Modified Asphalt Mortar
Table 1
Indicators of raw materials.
| | Materials | Property | Value |
| | Matrix asphalt | Penetration (25°C, 0.1 mm) | 83 | | Ductility (15°C, cm) | >100 | | Softening point (°C) | 46 | | Penetration index | −1.4 | | Dynamic viscosity (60°C, Pa·s) | 175 | | Density (g/cm3) | 1.004 |
| | SBS | Block ratio | 30/70 | | Tensile strength (MPa) | 21.6 | | Elongation at break (%) | 850 | | Relative molecular mass | 28 × 104 |
| | Silica fume | Appearance | Grey | | SiO2 content (%) | >92 | | pH | 6∼8 | | Particle size distribution (μm) | 0.1∼0.3 | | Granularity (mesh) | 300∼500 | | Loose density (g/cm3) | 0.1∼0.2 | | Tight heap density (g/cm3) | 0.3∼0.4 | | Specific surface area (m2/g) | >25 | | Burning loss (%) | <5 | | Impurity content (%) | <8 | | Water content (%) | <5 |
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