In the cement industry clinker, a synthetic material obtained from clay and limestone, is the result of a complex industrial process. The nature of the resulting phases and their relative proportions in the clinker are essential elements for a clear understanding of its chemical and mechanical properties. Selective dissolution methods enable the mineralogical phases to be isolated. They are analysed by diffraction and the measurement of the relative areas of the characterstic peaks of the phases of the clinker, with no internal standard, enables the information obtained to be related to the expected properties of the final product. This method of identifying the composition of the clinker permits a refinement of the results obtained by X-ray fluorescence. Resume : Dans l'industrie cimentikre, le clinker, matkriau noble par excellence, obtenu A partir d'argile et de calcaire, est le resultat d'un processus industriel complexe. La nature des phases qui en resultent et leurs proportions relatives dans le clinker sont les elements essentiels d'une bonne comprehension des proprietks chimiques et mecaniques du ciment. Les methodes de dissolution selective permettent d'isoler les phases mineralogiques. Celles-ci sont analysees par diffraction et la mesure des aires relatives des pics caractkristiques des phases du clinker, sans etalon interne, conduit A relier les informations obtenues aux proprietes que l'on attend du produit final. La composition du clinker ainsi obtenue permet d'affiner les resultats fournis par la fluorescence X. GCneralite~ : I,e ciment est un liant hydraulique, c'est-&-dire qu'il forme avec l'eau une p2te plastique ccfaisant prise et durcissant progressivement, m&me A l'abri de l'air, notamment sous l'eau)) (definition de la norme fran~aise NF P 15-301). Le processus de fabrication suit le schema gCneral suivant :
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