Abstract:
L' invention se rapporte à une structure filtrante de gaz chargés en particules comprenant une pluralité d'éléments filtrants du type en nid d'abeilles, ladite structure étant obtenue par l'assemblage desdits éléments, solidarisés les uns aux autres au moyen d'un ciment de joint, ledit ciment de joint étant un matériau composite essentiellement inorganique, de préférence minéral comprenant au moins, en masse et à l'exclusion de l'eau et des ajouts organiques éventuels; entre 30 et 95% d'une charge constituée par un ensemble de grains dont la température de fusion est supérieure à 1000 °C et dont lesdits grains ont un diamètre supérieur à 30 micromètres, entre 5 et 70% d'une matrice liante incorporant une phase géopolymère, ladite matrice liante comprenant, en pourcentage poids des oxydes correspondants : Si0 2 : entre 20 et 80%, A1 2 0 3 : entre 3 et 50%, R 2´ 0 : entre 3 et 30%, R 2´ 0 représentant la somme des oxydes d'alcalin présents dans la matrice liante.
Abstract:
The invention provides a roofing tile comprising: (a) a substrate; and (b) a coating disposed on said substrate, said coating resulting from hydration and hardening of a mixture comprising a hydraulic binder, said hydraulic binder comprising at least 60% by weight of a source of calcium aluminate and no more than 1% by weight of sulfate. The invention also provides methods for making the tile. Durability, acid resistance and freeze-thraw resistance are enhanced due to formation of a dense layer of hydrated alumina (AH3) gel that fills the pores at the surface exposed to environmental impact.
Abstract:
The invention provides a roofing tile comprising: (a) a substrate; and (b) a coating disposed on said substrate, said coating resulting from hydration and hardening of a mixture comprising a hydraulic binder, said hydraulic binder comprising at least 60% by weight of a source of calcium aluminate and no more than 1% by weight of sulfate. The invention also provides methods for making the tile. Durability, acid resistance and freeze-thraw resistance are enhanced due to formation of a dense layer of hydrated alumina (AH3) gel that fills the pores at the surface exposed to environmental impact.
Abstract:
The invention provides a roofing tile comprising: (a) a substrate; and (b) a coating disposed on said substrate, said coating resulting from hydration and hardening of a mixture comprising a hydraulic binder, said hydraulic binder comprising at least 60% by weight of a source of calcium aluminate and no more than 1% by weight of sulfate. The invention also provides methods for making the tile.