Table 10.

ANOVA for 365-day compressive strength.

Variance Source	Sum of Squares	Df	Mean Square	F Value	Significance	Contribution of Factor (%)
$w/b$	756.239	2	378.120	14.161	0.001	59.02
GGBS content	167.514	5	33.503	1.255	0.354	2.86
Fiber content Δ	28.285	2	14.143
Error	238.724	8	29.841
Error Δ	267.009	10	26.701
Total	1190.763	17

Note: The effect of fiber content is within the error.