Analysis of the Influence of SBS Content and Structure on the Performance of SBS/CR Composite Modified Asphalt

Table 1

Basic performances of neat asphalt.

Item	Unit	Standard values	Values
Penetration (25°C, 100 g, 5 s)	0.1 mm	80∼100	84
Penetration index	—	−1.5∼1.0	−1.02
Softening point	°C	≥45	46.0
Dynamic viscosity (60°C)	Pa·s	≥160	178
Ductility (10°C)	cm	≥20	>100
Ductility (15°C)	cm	≥100	>100
RTFOT residue
Quality change	%	−0.8∼0.8	−0.112
Residual penetration ratio	%	≥57	62.4
Residual ductility (10°C)	cm	≥8	11.9