Table 2.

Theoretical Effective Porosity and Measured Effective Porosity under different ratios.

Grading scheme	Measured porosity	Theoretical porosity
n = 0.3	0.521	0.509
n = 0.4	0.509	0.506
n = 0.5	0.496	0.500
n = 0.6	0.500	0.507
n = 0.7	0.517	0.508
Single particle size group A	0.482	0.498
Single particle size group B	0.559	0.528
Single particle size group C	0.590	0.552
Single particle size group D	0.600	0.557