147 research outputs found
Hydration of water- and alkali-activated white Portland cement pastes and blends with low-calcium pulverized fuel ash
Pastes of white Portland cement (wPc) and wPc-pulverized fuel ash (pfa) blends were studied up to 13 years. The reaction of wPc with water was initially retarded in the presence of pfa particles but accelerated at intermediate ages. Reaction with KOH solution was rapid with or without pfa. A universal compositional relationship exists for the C-A-S-H in blends of Pc with aluminosilicate-rich SCMs. The average length of aluminosilicate anions increased with age and increasing Al/Ca and Si/Ca; greater lengthening in the blends was due to additional Al3+ at bridging sites. The morphology of outer product C-A-S-H was always foil-like with KOH solution, regardless of chemical composition, but with water it had fibrillar morphology at high Ca/(Si+Al) ratios and foil-like morphology started to appear at Ca/(Si+Al) ≈1.2-1.3, which from the literature appears to coincide with changes in the pore solution. Foil-like morphology cannot be associated with entirely T-based structure
ChemInform Abstract: SILICON-29 AND CARBON-13 NMR STUDIES OF ORGANOSILICON CHEMISTRY. X. THE STRUCTURE OF SI8O11(OSIME3)10
ChemInform Abstract: Analysis and Prediction of Acid-Base Reactios Between Oxides and Oxysalts Using the Optical Basicity Concept
The complete analysis of the polyorganosiloxanes formed by the trimethylsilylation of the minerals olivine and suzorite
(M.) Gebhart and (A.) Neuhaus. Epitaxy Data of Inorganic and Organic Crystals. Volume 8 of Group III of Landolt-Börnstein, Numerical Data and Functional Relationships in Science and Technology; ed. K.-H. Hellwege and A. M. Hellwege. Berlin, Heidelberg, and New York (Springer-Verlag), 1972, vii + 186 pp. Price $37.50.
The trimethylsilylation of sodium silicate. Dependence of yield and molecular weight of the product on various mixing methods
Drying of sodium silicate solutions
Sodium silicate solutions with a silicon dioxide:sodium monoxide mole ratio of 3.41:1 were dried gently to give amorphous solids. These solids, together with the products obtained by heating them at various temperatures up to ∼ 200°c, were studied by differential thermal analysis, solubility tests and other techniques. The resultant data give some insight into the structural changes which occur in the solid during the drying process
Derivatographische und röntgenographische Untersuchungen von mit Natriumcyclotriphosphat modifizierten Natronwassergläsern
Microanalytical studies (X-ray photoelectron spectrometry) of surface hydration reactions of cement compounds
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