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Etude des mécanismes réactionnels dans l'hydratation des silicates et aluminates tricalciques en présence d'un filler calcaire

Abstract : This study shows how limestone reacts in the hydration of tricalcium aluminate and silicate, main constituents of Portland cement. The effect of limestone is characterized for different hydration times with different analytical techniques: XRD, SEM, DSC, TGA, 29Si NMR and IR Portland cement hydration gives a pH equal to 12 to 13, so in the first part of this study, limestone solubility in basic solutions is investigated. In the second part, we show the incorporation of coexistence of these phases, the formation of solid solutions CxSyCuHz-CH occurs. Third, C3A hydration with or without limestone agrees with litterature. Endly, we study the hydration of a simple cement (C3S + C3A) with or without calcium carbonate and CaSO4. Formation of CxSyAtCuHz ,ettringite, C4ACH11 and portlandite are noted. The cohabitation of these phases entail the existence of chemical complexes and substitued ettringite. The effect of different atmospheres on the samples is also studied.
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https://hal.univ-lorraine.fr/tel-01747120
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Myriam Chloup-Bondant. Etude des mécanismes réactionnels dans l'hydratation des silicates et aluminates tricalciques en présence d'un filler calcaire. Autre. Université Henri Poincaré - Nancy 1, 1996. Français. ⟨NNT : 1996NAN10003⟩. ⟨tel-01747120⟩

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