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.

PropertyUnitsTest resultsTechnical requirementsSpecification

Penetration (25°C, 100 g. 5 s)0.1 mm68.260–80JTG E20 T0604
Penetration index/-0.743-1.5∼+1.0
Softening point (R&B)°C49.1≥46JTG E20 T0606
Ductility at 15°Ccm>100>100JTG E20 T0605
After TFOT (163°C, 85 min)
Mass loss%0.15≤±0.8JTG E20 T0609
Residual penetration rate (25°C)%64≥61JTG E20 T0604
Residual ductility (15°C)cm8.1≥6JTG E20 T0605