[Retracted] Empirical Investigation on Compressive Strength of Geopolymer and Conventional Concretes by Nondestructive Method

Table 1

Cement and fly ash chemical composition.

Component	% of cement	% of FA
Loss ignition	1. 8	2.0
SiO2	20. 4	60.54
Fe2O3	3. 2	5.87
Al2O3	3. 9	26.20
CaO	63	1.91
MgO	2. 4	0.38
K2O + Na2O	—	1.02
SO3	3	0.23