Experimental Investigation on Strength and Water Permeability of Mortar Incorporate with Rice Straw Ash

Table 2

Chemical properties of OPC and RSA.

Chemical compositions	Cement (OPC)	Rice straw ash (RSA)
SiO2	21.5	76.00
Al2O3	5.2	0.69
Fe2O3	3.5	0.63
CaO	65.4	4.96
MgO	1.2	2.65
SO3	2.7	1.90
Na2O	0.2	1.36
K2O	0.2	9.89