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This paper presents the results obtained by utilization of pulverized coal fly ash both as raw mix component for Portland cement clinker and as admixture to cement type CEM II/B-V, too. The fly ash was analyzed from point of view of chemical, mineralogical and of radioactivity content. Two samples of raw mixes were prepared, one with raw materials as a reference sample consisting from limestone, clay, sand and pyrite cinder, and another with 10.14\% fly ash instead of clay. Raw mixes were ground at a fineness expr...