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Values of variation factors.
| Factor Code | The Physical Meaning of the Factor | Level of Variation | Interval of Variation δ | ||||
|---|---|---|---|---|---|---|---|
| −2 | −1 | 0 | 1 | +2 | |||
| X1 | The content of nanosilica, % by weight of cement | 2.5 | 3 | 4 | 5 | 5.5 | 1 and 0.5 |
| X2 | Additive content MELFLUX 1641 F, % by weight of cement | 0.4 | 0.7 | 1.4 | 2.1 | 2.4 | 0.7 and 0.3 |
| X3 | The content of the additive “MC-PowerFlow”, % by weight of cement | 1.5 | 2 | 3 | 4 | 4.5 | 1 and 0.5 |
| X4 | W/C ratio | 0.30 | 0.31 | 0.33 | 0.35 | 0.36 | 0.02 and 0.01 |
