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

Table 7

ANOVA table for optimum moisture content.

Factors	Square of deviance	Degree of freedom	Mean square	F ratio	F critical value	Significant
Coal gangue	1.709	2	0.8545	2.322	F0.01 (2, 2) = 99
Fly ash	3.236	2	1.618	4.397	F0.05 (2, 2) = 19	O
Lime	1.449	2	0.7245	1.969	F0.1 (2, 2) = 9
Error	0.736	2	0.368		F0.25 (2, 2) = 3
Sum	7.13	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.