Effect of Metakaolin on Strength and Efflorescence Quantity of Cement-Based Composites

Table 2

Chemical properties of metakaolin.

Item	SiO2	Al2O3	Fe2O3	Tio2	SO4	P2O5	CaO	MgO	Na2O	K2O	L.O.I
Mass % as oxide	52–55	41–44	<1.9	<3.0	<0.05	<0.2	<0.2	<0.1	<0.05	<0.75	<0.5