Abstract
Summary Fly ash from power plant Gacko (Bosnia and Herzegovina, Yugoslavia) contains up to 50 wt. 7. free lime and 13 wt.% anhydrite: the rest are Al, Si, Ca, Fe, Mg, Na, and K oxides in glassy phase. Fly ash is low radioactive therefore it was considered for the use in civil engineering. Blend made with 70 wt.% fly ash and 30 wt.% silica fume corresponds to the quality of binder for soil grouting. Because of high free lime content in original fly ash, which causes unsoundness, fly ash is not suitable as ingredient of any hydraulic binder, like pozzolanic or masonry cement. Therefore original fly ash was treated with water for the hydration of free lime. Obtained “hydrated fly ash” mixed with 30 wt.% of ordinary portland cement corresponds to the quality of masonry cement. Blends, which correspond to the quality of binder for soil grouting, were tested at the construction site of a dam for hydro-power plant and at lignite mine for injection works. Binder which corresponds to the quality of masonry cement was used as mortar for masonry work and for outdoor and indoor plastering of walls. Satisfactory results were obtained in all these uses.
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