Table 1.

Chemical compositions of kaolin and metakaolin.

Raw Materials	Chemical Composition (wt%)
	${\mathbf{SiO}}_2$	${\mathbf{Al}}_2{\mathbf{O}}_3$	${\mathbf{K}}_2\mathbf{O}$	${\mathbf{Fe}}_2{\mathbf{O}}_3$	${\mathbf{TiO}}_2$	$\mathbf{PbO}$	${\mathbf{P}}_2{\mathbf{O}}_5$	$\mathbf{BaO}$	$\mathbf{MgO}$
Kaolin	54.37	39.78	2.11	0.916	0.662	0.602	0.445	0.200	0.197
Metakaolin	52.97	41.09	2.08	0.897	0.646	0.591	0.504	0.265	0.218