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J. Korean Ceram. Soc. > Volume 18(4); 1981 > Article
Journal of the Korean Ceramic Society 1981;18(4): 237.
국산 인산석고에 함유된 불순물들이 Portland Cement의 수경성에 미치는 영향
인식환, 정형진
Effect of Impurities Included in the Domestic Waste Phosphogypsum on Hydration of Portland Cement
The effects of impurities, included in the by-produced phosphogypsum from the dihydrate process, on the hydration of portland cement were studied. Six gypsums were adopted in this study; four different raw phosphogypsums from domestic fertilizer plants, a reprocessed phosphogypsum and a reagent grade pure gypsum. Cements with differing $SO_3$ content, were synthesized by grinding two different commercial clinkers and the above six gypsums together. The effects of the impurities were investigated by measuring the setting time, the non-evaporable water coatent, X-ray phase analysis of cement pastes and the compressive strength of cement mortar specimens. It was found that the soluble $P_2O_5$ known as one of injurious impurities on the hydration of portland cement, included in the demestic raw phosghoypsum cxneedigply by far the specified amounts of the Korean Industrial Standards (L9005), and retarded the setting time severely, thus the strength development of cement was delayed at the earlier stage of hydration.
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