Effects of Crumb Rubber Size and Concentration on Performance of Porous Asphalt Mixtures

Table 3

Physical properties of conventional bitumen.

Properties	Specification	Results
Penetration at 25°C, 100 g, 5 s (0.1 mm)	ASTM D5	63
Softening point (°C)	ASTM D36	49
TFOT residue	ASTM D2872-04
Mass loss (%)	ASTM D2872	0.096
Retained penetration (%)	ASTM D5	37
Softening point after hardening (°C)	ASTM D36	61
Flashing point (°C)	ASTM D92	240
Specific gravity at 25°C	ASTM D70	1.021