Pavement and Noise Reduction Performance of Open-Graded Asphalt Friction Course Improved by Waste Tire Crumb Rubber

Table 1

Performance requirements and test results of crumb rubber.

Items	Slender flat content (%)	Hardness (N)	Carbon black content (%)	Impurity content (%)	Passing ratio (%)
					4.75 mm	2.36 mm	1.18 mm
Test results	7.8	71	30.7	0.39	100	94.2	5.8
Requirements	≤10	≥55	25–38	<0.75	100	90–100	0–10