Table 4 Orthogonal experimental design with 4 levels of 4 factors.

From: Preparation and application conductive concrete from iron tailings to the teaching reform in engineering materials courses

NO

W

G

I

C

1

1

1

1

1

2

1

2

2

2

3

1

3

3

3

4

1

4

4

4

5

2

1

2

3

6

2

2

1

4

7

2

3

4

1

8

2

4

3

2

9

3

1

3

4

10

3

2

4

3

11

3

3

1

2

12

3

4

2

1

13

4

1

4

2

14

4

2

3

1

15

4

3

2

4

16

4

4

1

3

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