Experimental Study on Physical-Mechanical Properties of Expansive Soil Improved by Multiple Admixtures

Table 9

ANOVA table for free expansion rate.

Factors	Square of deviance	Degree of freedom	Mean square	F ratio	F critical value	Significant
Coal gangue	20.596	2	10.298	48.009	F0.01 (2, 2) = 99
Fly ash	16.702	2	8.351	38.932	F0.05 (2, 2) = 19
Lime	21.449	2	10.7245	49.998	F0.1 (2, 2) = 9
Error	0.429	2	0.2145		F0.25 (2, 2) = 3
Sum	59.18	8

In ANOVA, if the mean square value of a factor is less than or equal to the error mean square, it will be treated as the error term, and F value will not be calculated, where “” means very significant , “” means significant 0.01 ≤ , “” means relatively significant 0.05 ≤ , and “O” means that 0.1 ≤  has a certain influence.