Chemical analyses of the oxide content of eleven fly
ashes and of portland cement were obtained to evaluate
their influence on fly ash reactivity. The silicon dioxide
(Si0 2 ) aluminum oxide (A^O^) , iron oxide (Fe2 0 _) , calcium
oxide (CaO), magnesium oxide (MgO), sulfur trioxide (SO^),
and alkalies ( ^ 2 © and 1^0) Portland cement were determined
by standard ASTM Method C 114 (Chemical Analysis of
Hydraulic Cement). The above-mentioned oxides of the fly
ash samples were determined by ASTM Method C 311 (Sampling
and Testing Fly Ash or Natural Pozzolans for Use as a
Mineral Admixture in Portland Cement Concrete) which is
similar to ASTM C 114 except for some sample preparation