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- W2095033306 abstract "The solution chemistry of Portland cement and C3S pastes has been studied with particular attention to the concentrations of calcium and silicon in the aqueous phase during early stages of hydration. Results are discussed in relation to solubility data available from studies of OPC and C3S pastes and from the CaOSiO2H2O system. It is shown that under normal conditions the concentration of silicon in solution is extremely low (<2ppm) and this remains unchanged even when hydration is accelerated in the presence of CaCl2. However, retarding admixtures such as oxalic acid and EDTA, which are strong calcium binding agents, release a flush of silicon into solution within the first few minutes of hydration. The results lend support to the osmotic membrane model of cement hydration and also provide insight into the mechanisms by which accelerating and retarding admixtures function. El proceso quimico de solución del cemento Portland y pastas de C3S se ha estudiado, prestando particular atención a las concentraciones de calcio y silicio en la fase acuosa durante los primeros momentos de la hidratación. Los resultados se consideran con relación a los datos de solubilidad obtenidos mediante estudio de pastas de OPC y C3S y del sistema CaOSiO2H2O. Se demuestra que en condiciones normales la concentración de silicio en la solución es muy baja (<2ppm) y que permanece constante incluso cuando se acelera la hidratacion en presencia de CaCl2. Siu embargo, aditivos como ácido oxálico y EDTA, que son fuertes agentes captores de calcio liberan un flujo de silicio en la solución despues de unos pocos minutos de producitse la hidratación. Los resultados justifican el modelo basado en membranas osmóticas de hidratación del cemento y sirve para explicar los mecanismos de funcionamiento de aditivos de aceleración y retardo." @default.
- W2095033306 created "2016-06-24" @default.
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- W2095033306 date "1981-09-01" @default.
- W2095033306 modified "2023-09-26" @default.
- W2095033306 title "Calcium and silicon concentrations in solution during the early hydration of portland cement and tricalcium silicate" @default.
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- W2095033306 doi "https://doi.org/10.1016/0008-8846(81)90026-0" @default.
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