Research Article
Modification Mechanism of Asphalt Modified with Rock Asphalt and Styrene-Butadiene Rubber (SBR)
Table 1
Technical properties of asphalt binder of 70-penetration grade.
| Property | Units | Test results | Technical requirements | Specification |
| Penetration (25°C, 100 g. 5 s) | 0.1 mm | 68.2 | 60–80 | JTG E20 T0604 | Penetration index | / | -0.743 | -1.5∼+1.0 | Softening point (R&B) | °C | 49.1 | ≥46 | JTG E20 T0606 | Ductility at 15°C | cm | >100 | >100 | JTG E20 T0605 | After TFOT (163°C, 85 min) | Mass loss | % | 0.15 | ≤±0.8 | JTG E20 T0609 | Residual penetration rate (25°C) | % | 64 | ≥61 | JTG E20 T0604 | Residual ductility (15°C) | cm | 8.1 | ≥6 | JTG E20 T0605 |
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