Research of the Rheological Modification Mechanism of Crumb Rubber-Modified Asphalt Containing Polyamide 6 Additive

Table 1

Technical indicators of neat asphalt binder.

Index	Unit	Test result	Technical requirement	Test method
Penetration (25°C, 100 g, 5 s)	0.1 mm	69.3	60∼80	JTG E20 T0604
Penetration index (PI)	—	−0.825	−1.5∼+1.0
Softening point (R and B)	°C	47.2	≥46	JTG E20 T0606
5°C ductility	cm	>100	>100	JTG E20 T0605
After TFOT
Quality change	%	0.20	≤±0.8	JTG E20 T0609
Residual penetration ratio (25°C)	%	65	≥61	JTG E20 T0604
Residual ductility (15°C)	cm	7.8	≥6	JTG E20 T0605