Table 3 Factors and levels of orthogonal experiments.

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

Factors

W

G (%)

I

C (%)

Level 1

0.18

10

0.8

0.25

Level 2

0.20

14

1.0

0.50

Level 3

0.22

18

1.2

0.75

Level 4

0.24

22

1.4

1

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