Characterization of Air Void in Porous Asphalt Mixture Using Image Techniques and Permeability Test

Table 1

Properties of SBS binder.

Properties	Units	Requirements	Test results
Penetration (25°C)	0.1 mm	30–60	54.8
Ductility (5°C)	cm	≥20	30.7
Soft point	°C	≥60	80.7
Kinematic viscosity (135°C)	Pa.s	≤3.0	1.79
Penetration index		≥0	0.19

Note. The requirements followed the standard (JTG E20-2011 standard test methods of bitumen and bituminous mixtures for highway engineering).