Abstract
The purpose of this study was to investigate the degree of pozzolanic reaction and active ion dissolution of fly ash in different concentrations of Ca(OH)2 solution dissolving in 48 hours. The active ion concentration and conductivity of filtrate were measured by inductively coupled plasma optical emission spectrometer and conductivity metre. The micromorphology of residue in different dissolving times was analysed by field emission transmission electron microscopy. The results indicate the following: (a) the fly ash has pozzolanic activity and it has similar variation of active Al3+, Fe3+, Si4+ ion concentration in 1 mol L−1 Ca(OH)2 solutions compared with 0·1 mol L−1 Ca(OH)2 solutions with an increase in dissolving time: the concentration of Al3+, Si4+ ions appears to have two peaks at 6 and 24 hours, whereas Fe3+ ion concentration appears declining. (b) Conductivity of 1 and 0·1 mol L−1 fly ash–Ca(OH)2 solution shows decreasing tendency, the degree of pozzolanic reaction in 1 mol L−1 Ca(OH)2 solution appears to be higher than in 0·1 mol L−1 Ca(OH)2 solution.
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