Runoff Purification Effects of Permeable Concrete Modified by Diatomite and Zeolite Powder

Table 8

Dimensionless results of gray correlation analysis.

Number	Effective porosity (%)	Compressive strength (MPa)	General purification effect (%)
X0	1.00	0.84	2.73
X1	1.00	0.65	1.29
X2	1.00	1.00	1.84
X3	1.00	0.83	2.46
X4	1.00	0.59	2.50
X5	1.00	0.90	1.90
X6	1.00	0.70	2.37
X7	1.00	0.41	2.02
X8	1.00	0.81	2.12
X9	1.00	0.70	2.70
X10	1.00	0.48	2.50
X11	1.00	0.76	2.46
X12	1.00	0.58	2.75
X13	1.00	0.38	2.08