Residual Capability of Alkali Binding by Hydrated Pozzolanic Cements in Long-Service Concrete Structures

Table 2

Chemical compositions of natural pozzolana and coal fly ash.

Oxide (wt.%)	Natural pozzolana	Fly ash
SiO2	40.77	49.37
Al2O3	20.41	29.23
Fe2O3	2.85	1.59
CaO	13.02	6.63
SO3	0.55	0.33
K2O	6.55	2.12
Na2O	0.67	0.05
Na2Oeq	4.99	1.45
LOI	4.17	4.82