Table 4.

Factors and levels of experiment.

Factors	Levels
	1	2	3	4	5	6
$\mathrm{A}. w/b$	0.55	0.44	0.36
B. GGBS content (%mass of cementitious material)	0	10	20	30	40	50
$\mathrm{C}. \mathrm{Fiber} \mathrm{content} (\mathrm{k}\mathrm{g}/{\mathrm{m}}^3$)	3	6	9
D. Sodium chloride solution $\mathrm{concentration} (\%$)	3.5	5.0	7.0