High-Temperature Performance of Asphalt Mixtures: Preliminary Analysis for the Standard Technical Index Based on Gray Relational Analysis Method

Table 1

The basic physical properties of six asphalt binders.

Asphalt binders		Penetration (25°C, 100 g, 5 g), 0.1 mm	Penetration index n/a	Softening point, °C	Ductility (5/15°C), cm	Viscosity (60°C), Pa·s
Unmodified	PEN20	23	0.81	64.2	10/62	3315.2
	PEN50	54	0.29	52.4	1/87	393.8
	PEN90	91	−0.94	47.7	0.5/˃100	198
Modified	SBS I-C	74	0.03	66.0	56/˃100	27360
	SBS I-D	57	−0.05	66.9	26/˃100	49755
	TPS	69	0.89	80.7	38/˃100	82459

Note that the date of ductility before “/” was tested at 5°C, and date of ductility after “/” was tested at 15°C.