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Mixtures of 12 commercial portland cement clinkers and water were filtered at 7 minutes and at 2 hours after m ixing, and the chemical composition, pH, conductivity, surface tension, and density of the extracts were determined. The effects on the composition and physical properties of the extracts, produced by the addition of small amounts of various materials to the pastes, were studied in parallel experiments. The added materials included gypsum, which was used in preparing the cements from the clinkers, calcium chloride, calcium acetate, fluosilic ic acid, sucrose, T D A, tannic acid, and triethanolamine. In the majority of the extracts, soda and potash were present in greater amounts than any of the other dissolved oxides. Relatively high concentrations of sulfate occurred in the extracts of the clinkers that contained the larger amounts of potash. The lime concentration and basicity of the extracts were largely determined by the amounts of alkali oxides present. The concentration of silica corresponded approximately to the reported solubility of silica in lime solutions. Low concentrations of oxides of the R 20 a group were found except in extracts from pastes con taining the added organic materials. CONTENTS Page

Composition and physical properties of aqueous extracts from Portland cement clinker pastes containing added materials