Table 8 Orthogonal experimental factors and levels of cement—fly ash grout.

From: Research on advanced grouting curtain technology for water interception and control at the source of aquifer in coal seam roof

level

Factor

Water solid ratio

Fly ash content/%

1

3:1

20

2

2:1

30

3

1:1

40

4

0.8:1

50

5

0.6:1

60

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