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

Table 3

Physical index of aggregate.

Stone	Index	Test results	Requirements
Coarse aggregate	Apparent density (g·cm^−3)	2.767	≥2.50
	Gross volume density (g·cm^−3)	2.712	－
	Crushing value (%)	6.5	≤26
	Los Angeles attrition rate (%)	7.8	≤28
	Flat and elongated particles (%)	10	≤15
	Water absorption (%)	0.8	≤2.0
Fine aggregate	Apparent density (g·cm^−3)	2.700	≥2.50
Mineral powder	Apparent density (g·cm^−3)	2.715	－