Papers by Keyword: Calcium Aluminate Cements

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Authors: Thierry J. Chotard, M.P. Boncoeur-Martel, A. Smith, J.P. Dupuy, Christian Gault
Authors: Nathalie Richard, Nicolas Lequeux, Philippe Boch
Authors: L. Morejón-Alonso, Luis Alberto Santos, R. García Carrodeguas
Abstract: The effect of using Na2HPO4 solution as mixing liquid in the physicochemical and mechanical properties of calcium aluminate cement (CAC), with a view to a possible reinforcement additive of conventional α-TCP-based CPC was studied. The results showed that the degree of the hydration reaction of CaAl2O4 (CA) increased when Na2HPO4 solution was used as mixing liquid. The porosity of cement was also lower (37.9 ± 1.3 %) than for H2O (33.2 ± 3.6 %). The values of compressive strength for cements prepared with both mixing liquids were lower than 3 MPa due to the excessive L/P ratio employed and large porosity. After immersion in SBF, only the Al(OH)3 hydrate is observed and no other crystalline hydrated calcium aluminate nor calcium phosphate was formed in any of the cements. Both cements released Ca ions to, and removed P ions from SBF, being this effect more remarkable when Na2HPO4 was used. As for other CAC, no Al was released to the SBF and no potential toxicity due to this ion should be expected.
Authors: T. Çiçek, A. Altun, I. Cöcen, Ö. Suretti, C. Gerçek
Authors: J. Podwórny, T. Wala, J. Sawków
Abstract: were synthesized in a two-step sintering process. Qualitative and quantitative XRD and Rietveld method were applied to control the degree of reaction after each sintering step. Two microscopic techniques for Q-phase crystal habit determination were applied: reflected light microscopy and electron scanning microscopy. Additionally, WDS x-ray microprobe for chemical composition determination of pleochroite crystals was used. A microscopic observation of the polished sections and fractures etched with 10 % HCl and 1 % Borax water solution was carried out. It was observed that Q-phase crystallised in a prism form on the non-etched samples. Lamellar microstructure of prismatic pleochroite crystals on the etched samples was revealed and layers of intergrowths (most probably gehlenite (Ca2Al2SiO7) were observed. The obtained results were discussed on the basis of literature data.
Authors: Thierry J. Chotard, A. Smith, N. Gimet-Bréard, Marc Huger, D. Fargeot, Christian Gault
Authors: F. Guirado, S. Galí, S. Chinchón
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