An Alternative to Clay in Building Materials: Red Mud Sintering Using Fly Ash via Taguchi’s Methodology

Table 2

𝐿₉ table and observed values of pH.

Run	Factors				Final pH			Ratios of pH			𝑆/𝑁 ratio
	A	B	C	D	𝑅1	𝑅2	𝑅3	𝑅^′1	𝑅^′2	𝑅^′3
	Weight of red mud	Weight of silicate material	Volume of water	Sintering temp.
1	20	30	8	1000	9.12	9.25	9.3	0.77	0.76	0.75	−2.40
2	20	20	12	900	10.7	10.65	10.54	0.65	0.66	0.66	−3.63
3	30	10	12	1000	9.65	9.62	9.59	0.73	0.73	0.73	−2.76
4	10	20	10	1000	9.58	9.32	9.31	0.73	0.75	0.75	−2.56
5	30	20	8	1100	9.10	9.15	9.18	0.77	0.77	0.76	−2.32
6	30	30	10	900	10.68	10.55	10.61	0.66	0.66	0.66	−3.62
7	10	30	12	1100	8.9	8.92	8.88	0.79	0.78	0.79	−2.09
8	20	10	10	1100	9.27	9.25	9.3	0.76	0.76	0.75	−2.43
9	10	10	8	900	10.69	10.6	10.582	0.65	0.66	0.66	−3.62