The physical tests to be conducted for fly ash at the site
The intensity of these processes depends largely on the ash fineness (particle size and particle size distribution) so that the pozzolanic reactivity increases with the specific surface of the ash. International standard ASTM C 311 describes the procedures of chemical and physical methods for characterization of fly ash, and standard ASTM C 618 provides chemical and physical criteria related to classification.
all samples of ash that were for seven days exposed in a humid environment contains a substantial amount of amorphous glassy-matter, but also crystal phase of feldspar, melilite, mullite, very little anhydrite and quartz is present. In the specimens that were subjected for 28 days besides the already mentioned minerals a trace of calcite occurs in the sample;
