Geopolymeric cement based on fly ash and harmless to use

Details Geopolymeric cement based on fly ash and harmless to use Geopolymeric cement based on fly ash and harmless to use

C - Chemistry, Metallurgy

04

B

C04B 28/00 (2006.01) C04B 18/08 (2006.01)

Patent

CA 2658117

Geopolymeric cements based on aluminosilicate fly ash of class F, which, contrary to the prior art, are harmless to use and harden at ambient temperature, favouring their use in common applications in the construction and civil engineering fields. This harmlessness is achieved thanks to a mixture containing: 10 to 15 parts by weight of a non-corrosive alkali metal silicate solution in which the M2O:SiO2 molar ratio is less than 0.78, preferably less than 0.69, and the SiO2:M2O ratio is greater than 1.28, preferably greater than 1.45, M denoting Na or K; added to this are 10 to 20 parts by weight of water and 5 to 15 parts by weight of blast-furnace slag having a specific surface area of less than 400 m2/kg, preferably less than 380 m2/kg and also 50 to 100 parts by weight of class F aluminosilicate fly ash.

Ciments géopolymériques à base de cendres volantes silico-alumineuses de classe F qui, contrairement à l'art antérieur, sont dotés d'une grande innocuité d'emploi et d'un durcissement à la température ambiante, favorisant leur utilisation dans les applications communes du bâtiment et des travaux publics. Cette qualité d'innocuité est obtenue grâce à un mélange contenant : 10 à 15 parties en poids de solution de silicate alcalin non corrosive, dans laquelle le rapport molaire M2Oi:SiO2 est inférieur à 0,78, de préférence inférieur à 0,69, et le rapport SiO2:M2O supérieur à 1,28, de préférence supérieur à 1,45, M désignant Na ou K; on y ajoute 10 à 20 parties en poids d'eau et 5 à 15 parties en poids de laitier de haut fourneau de surface spécifique inférieure à 400 m2/kg, de préférence inférieure à 380 m2/kg et aussi 50 à 100 parties en poids de cendres volantes silico-alumineuses de classe F.

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