Study on Permeability and Blocking Resistance of Composite Specimen with Double-Layer Permeable Asphalt Mixture

Table 9

Blocking results of single-layer (PAC-10) specimen.

Particle size of blocking materials (mm)	Voidage of specimen (%)	Vertical seepage coefficient
		Initial permeability coefficient	After blocked 1 time	After blocked 2 times		After blocked 3 times	After blocked 4 times	After blocked 5 times	After cleaning
0.15	20	0.579	0.251	0.151		0.090	0.067	0.051	0.143
	22	0.668	0.314	0.207		0.129	0.100	0.070	0.217
	24	0.756	0.430	0.299		0.220	0.158	0.107	0.278