Strength and Durability Performance of Alkali-Activated Rice Husk Ash Geopolymer Mortar

Table 2

Chemical composition and physical properties of OPC and RHA.

Compound (%)	OPC	RHA
SiO2	20.90	90.79
Al2O3	5.40	2.22
Fe2O3	4.60	0.80
CaO	63.50	0.92
MgO	0.60	0.47
SO3	2.60	—
Na2O	0.15	0.50
K2O	0.25	0.30
LOI	2.00	4.00
Specific gravity	3.15	2.26
Average particle size (μ)	45.34	25.42
Colour	Grey	Grey