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Phosphogypse pour la production de matériaux de construction
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ISBN10: 6208404975
ISBN13: 9786208404970
Publisher: Editions Notre Savoir
Published: Dec 22 2024
Pages: 76
Weight: 0.27
Height: 0.18 Width: 6.00 Depth: 9.00
Language: French
ISBN13: 9786208404970
Publisher: Editions Notre Savoir
Published: Dec 22 2024
Pages: 76
Weight: 0.27
Height: 0.18 Width: 6.00 Depth: 9.00
Language: French
Cette étude était consacrée à l'utilisation du phosphogypse - déchet de la production d'engrais phosphorique, déchet de la production de chaux et sable d'orpaillage - pour former de nouveaux matériaux de construction. Les résultats obtenus lors des essais de résistance à la compression uniaxiale ont atteint 8,3 MPa au 3e jour de cure et 13,5 MPa au 90e jour. Le matériau avait un coefficient de résistance à l'eau de 0,95 à 28 jours, une absorption d'eau de 8,6 % et des valeurs d'expansion au 3e jour de 1 % et de 1,5 % après un an et demi de durcissement. Les propriétés mécaniques des matériaux développés répondent aux exigences de la norme NBR 7.170/83 pour les briques pleines des classes A, B et C et les blocs céramiques des classes 15 et 25. Les processus physico-chimiques impliqués dans la formation des structures des nouveaux matériaux ont été étudiés à l'aide de XRD, XRF, SEM et EDS, en raison de la transformation des minéraux cristallins et de la synthèse de substances amorphes, similaires aux structures présentes dans le gypse.
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