Investigation on the Properties and Distribution of Air Voids in Porous Asphalt with Relevance to the Pb(II) Removal Performance

Table 1

Main properties of asphalt, aggregate, filler, and fibre.

Material	Physical properties	Unit	Standard limit	Result
Asphalt binder	Penetration at 25°C	0.1 mm	≥40	5.20
	Softening point	°C	≥80	84.00
	Ductility at 15°C/5°C	cm	≥80	86/42
	Kinematic viscosity at 60°C	Pa·s	≥20,000	262,000
	Flash point	°C	≥260	290.00
	Loss on heating TFOT	%	≤0.6	0.12
Coarse aggregate (larger than 2.36 mm)	Crushed value	%	≤26	15.60
	Los Angeles abrasion value	%	≤28	13.34
	Apparent specific gravity	—	≥2.6	2.80
	Water adsorption	%	≤2	0.96
Fine aggregate (smaller than 2.36 mm)	Apparent specific gravity	—	≥2.50	2.72
	Soundness (larger than 0.3 mm)	%	≥10	13.00
	Soil content (smaller than 0.075 mm)	%	≤1	0.84
	Sand equivalent	%	≥60	65.00
Lime powder	Apparent gravity	g/cm^3	≥2.50	2.72
	Water content	%	≤1	0.20
Fibre	Fibre cut length	mm	≯m	3.50
	Color	—	—	Gray
	Oil adsorption	%	≥5.0% by the fibre total weight	8.60
	Moisture	%	≯5.0	0.00
	pH value	—	7.5 ± 1.0	7.40

Technical Specification of JTG F40-2004 and Technical Specification of CJJ/T 190-2012.