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Effet de l'ajout du phosphogypse sur les propriétés du ciment

Effet de l'ajout du phosphogypse sur les propriétés du ciment


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About the Book

L'emploi en cimenterie de phosphogypse comme régulateur de prise, porte essentiellement sur l'étude de l'impact de P2O5 sur les propriétés du ciment d'après l'incorporation de différentes quantités du phosphogypse sur un mélange de clinker et calcaire. Cette étude vise également à évaluer l'influence de la surface spécifique de Blaine (SSB) et des ajouts de calcaire sur le comportement mécanique du ciment à base de phosphogypse. Il s'avère, d'après les résultats obtenus, que l'utilisation du phosphogypse brut en tant que substituant du gypse naturel n'affecte pas les résistances pour les mortiers à long terme (7 jrs et 28jrs). Par contre, l'effet est notable pour les bétons plus jeunes (2jrs). D'autre part, il parait que le début et la fin de la prise sont généralement retardés proportionnellement à l'ajout du phosphogypse. Cette action retardatrice aurait pour origine la précipitation des composés phosphoriques au voisinage des particules du ciment, en formant un obstacle devant la progression de l'hydratation. L'attaque par une solution concentrée (40%) en acide sulfurique H2SO4 fait réduire les temps de prise des ciments.


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Product Details
  • ISBN-13: 9786139542079
  • Publisher: KS Omniscriptum Publishing
  • Publisher Imprint: Editions Universitaires Europeennes
  • Height: 229 mm
  • No of Pages: 112
  • Spine Width: 7 mm
  • Width: 152 mm
  • ISBN-10: 6139542073
  • Publisher Date: 26 Jan 2020
  • Binding: Paperback
  • Language: French
  • Returnable: N
  • Weight: 177 gr


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