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This research studies the potential for using ground fly ash from the Mae Moh power plant in Thailand as a pozzolanic material. Three different fly ash finenesses, viz., coarse original fly ash, ground medium fly ash, and ground fine fly ash, were used for the study. Ordinary Portland cement was partially replaced with fly ash at 20 % and 40 % by weight of the fly ash. The water to binder ratio was kept constant at 0.5 and the flow of mortar was maintained at 110 ± 5 % with the aid of superplasticizer. Compressive strength, chloride penetration and corrosion resistance of mortars were determined. Fine fly ash has a high potential to be used as a good pozzolanic material. The resistance to chloride penetration and corrosion resistance of mortar improve substantially with partial replacement of Ordinary Portland cement with ground fly ash. The use of finer fly ash results in a stronger and denser mortar which is due to better dispersion and filling effect as well as an increase in the pozzolanic reaction.

Chloride penetration and corrosion resistance of ground fly ash blended cement mortar