Study on the Applicability of Needle/Cone Penetration Experiment for Asphalt-Rubber

Table 1

Main technical indexes of base asphalt.

Experiment item	SK90#	Shell 90#	East Sea 90#
Density (25°C)/g⋅cm^−3	1.031	1.032	1.034
Needle penetration experiment (25°C)/0.1 mm	85	87	85
Force-ductility (15°C)/cm	>100	>100	>100
Softening point (°C)	46.0	45.5	46.0