6533b7d1fe1ef96bd125d784
RESEARCH PRODUCT
Mechanisms and parameters controlling the tricalcium aluminate reactivity in the presence of gypsum.
Laure RegnaudAndré NonatHélène MinardSandrine Garraultsubject
Isothermal microcalorimetryEttringiteGypsumFineness0211 other engineering and technologieschemistry.chemical_elementMineralogyHydrationchemical and pharmacologic phenomena02 engineering and technologyCalciumengineering.materialEttringitechemistry.chemical_compound021105 building & constructionGeneral Materials ScienceReactivity (chemistry)Tricalcium aluminateBuilding and ConstructionCa3Al2O6021001 nanoscience & nanotechnologyKineticschemistryChemical engineeringengineering0210 nano-technologyAFm phasedescription
International audience; To understand the mechanisms and the parameters controlling the reactivity of tricalcium aluminate in the presence of gypsum at an early age, a study of the hydration of the “C3A–sulphate” system by isothermal microcalorimetry, conductimetry and a monitoring of the ionic concentrations of diluted system suspensions have been carried out with various gypsum quantities. The role of C3A source and its fineness were also studied. This work shows the fast initial formation of AFm phase followed by ettringite formation during the period when the sulphate is consumed. It has been highlighted that the time necessary to consume all the gypsum varies with the type of C3A and it has been attributed to the intrinsic reactivity of each one and mainly to the change of fineness from one C3A to another. Results are discussed alongside hypothesis from the literature to explain the slowing down of C3A hydration process in the presence of calcium sulphate.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2007-10-01 |