Effect of Fiber Treatments on the Mechanical Properties of Sisal Fiber-Reinforced Concrete Composites

Table 8

ANOVA test for the compressive strength of SFRC.

	Source of variation	SS	df	MS	F	value	crit
7 days	Alkali concentration	134.29	3	44.76	47.08	0	3.01	Significant
	Soaking time	15.52	2	7.76	8.16	0.002	3.4	Significant
	Interaction	10.87	6	1.81	1.91	0.121	2.51	Insignificant
	Within	22.82	24	0.95
	Total	183.5	35
28 days	Alkali concentration	174.03	3	58.01	51.64	0	3.01	Significant
	Soaking time	7.77	2	3.89	3.46	0.048	3.4	Significant
	Interaction	24.76	6	4.13	3.67	0.01	2.51	Significant
	Within	26.96	24	1.12
	Total	233.52	35

Significant at 5% probability (). df, degrees of freedom; F, F-test for ANOVA two-way; MS, mean square; SS, sum of squares; value, calculated probability.