Table 1.

Chemical compositions of kaolin and metakaolin.

Raw materials	Chemical composition (wt/%)
	SiO2	Al2O3	SO3	K2O	Fe2O3	TiO2	ZnO	P2O5	MgO
Kaolin	56.63	34.74	4.61	1.46	0.82	0.59	0.32	0.27	0.17
Metakaolin	57.06	37.80	0.61	1.72	0.94	0.60	0.34	0.27	0.12