0000000000420642

AUTHOR

P. Bénard

showing 2 related works from this author

Influence of orthophosphate ions on the dissolution of tricalcium silicate

2008

International audience; Tricalcium silicate dissolution in the presence of orthophosphate ions was monitored by measuring the concentrations of calcium and silicate ions in dilute suspensions using a special dissolution cell coupled to an optical emission spectrometer. Results show that increasing adsorption of orthophosphate ions slows down the dissolution of Ca3SiO5 and that a calcium-phosphate precipitate may form at certain orthophosphate concentrations. These observations are correlated with results of calorimetric experiments carried out during the hydration of silica-rich cement pastes in the presence of the same salts.

Materials scienceInorganic chemistryCa3SiO50211 other engineering and technologiesHydrationMineralogychemistry.chemical_element02 engineering and technologyCalorimetryCalciumIonlaw.inventionchemistry.chemical_compoundAdsorptionlaw021105 building & constructionGeneral Materials ScienceDissolutionCementRetardationBuilding and Construction021001 nanoscience & nanotechnologySilicatePortland cementchemistryAdsorption0210 nano-technologyCement and Concrete Research
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Hydration process and rheological properties of cement pastes modified by orthophosphate addition

2005

Abstract The use of cement by nuclear industry for confining low radioactive waste knows a constant increase. The interest bore to this material is due to its mechanical and chemical properties. However, these properties may be modified by the nature and the amount of wastes introduced with the mixing solution especially with large amount of phosphate. Precipitation of hydroxylapatite in the cement paste at the very beginning after mixing was emphasized from a particular concentration of orthophosphate. It was also found that this phenomenon leads to an early rigidification of the cement paste. From a kinetics point of view, the evolution of hydration was both delayed and slowed down accord…

musculoskeletal diseasesCementMaterials sciencePrecipitation (chemistry)Mixing (process engineering)MineralogyHydroxylapatitePhosphateApatitechemistry.chemical_compoundAdsorptionchemistryChemical engineeringRheologyvisual_artMaterials ChemistryCeramics and Compositesvisual_art.visual_art_mediumJournal of the European Ceramic Society
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