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- W2314094788 abstract "In the previous paper concerning with Na2O-containing phase in portland cement clinker, it was indicated that the X-ray diffraction pattern of the ternary compound of Brounmiller and Bogue to which the composition NC8A3 is assigned, is not correct, and the prismatic dark phase in clinker of the systems C-A-F-S-M-N-(SO3) is the metastable phase of NC8A3, containing small amount of SiO2.Successively, some studies of K2O-containing phase in portland cement clinker have been made. From the microscopic observation and powder X-ray diffraction, the following results have been obtained.a. KC23S12 is not a ternary compound, but a stabilized α′-C2S by the formation of substitutional solid solution of K2O in C2S.b. The prismatic dark phase in preparation of the systems C-A-(F)-S-K is the metastable phase of KC8A3, containing small amount of SiO2 as solid solution or an integral part of the unit cell structure.Accordingly, the fact that the addition of increasing amounts of K2O to a raw mixture results in progressively increased amounts of free CaO in clinker is not only due to the formation of substitutional solid solution of K2O in C2S, but also the following reaction:3C3A+K2O=KC8A3+CaOFurthermore, the manner in which K2O is combined in portland cement clinker has been discussed." @default.
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- W2314094788 date "1955-01-01" @default.
- W2314094788 modified "2023-09-27" @default.
- W2314094788 title "K<sub>2</sub>O-Containing Phase in Portland Cement Clinker" @default.
- W2314094788 doi "https://doi.org/10.2109/jcersj1950.63.717_705" @default.
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