Classification of Performance Grades of High Modulus Asphalt and Its Mixture: Taking China as an Example

Table 1

Classification standard of high modulus asphalt.

Grades	Key index		Reference index
	Softening point (°C)	Rutting factor (kPa)	Creep stiffness modulus (MPa)	Creep rate
Excellent	[63, +∞)	[2.5, +∞)	[0, 143)	[0.42, +∞)
Good	[58, 63)	[1.6, 2.5)	[143, 267)	[0.33, 0.42)
General	[53, 58)	[1.0, 1.6)	[267, 300)	[0.30, 0.33)
Poor	[0, 53)	[0, 1.0)	[300, +∞)	[0, 0.30)

Note 1: the rutting factor in the table was measured at 10 Hz and 70°C in the temperature scanning test; note 2: the creep stiffness modulus and creep rate in the table were measured by bending creep stiffness test at −12°C for 60 s.