Research on Rheological Properties by Desulfurized Rubber Powder/SBS Composite-Modified Asphalt and Road Performance of Its Mixture

Table 1

The basic properties of SK 90^# virgin asphalt.

Items		Value	Requirements
Penetration (25°C, 0.1 mm)		89	80∼100
Penetration index		−0.6	−1.5∼+1.0
Ductility (10°C, cm)		>100	≥20
Softening point (°C)		46.0	≥45
Viscosity (60°C, Pa·s)		162.9	≥160
Flash point (°C)		294.3	≥245
Solubility (%)		99.97	≥99.5
Density (15°C, g/cm^3)		1.032	Measured
Aged asphalt (TFOT)	Loss on heating (%)	−0.512	≤±0.8
	Penetration ratio (%)	59.9	≥57
	Ductility (10°C, cm)	9	≥8