Treatment of fly ash for use in concrete

Details Treatment of fly ash for use in concrete Treatment of fly ash for use in concrete

C - Chemistry, Metallurgy

04

B

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

Patent

CA 2692751

A process for treating fly ash to render it highly usable as a concrete additive. A quantity of fly ash is obtained that contains carbon and which is considered unusable fly ash for concrete based upon foam index testing. The fly ash is mixed with an activator solution sufficient to initiate a geopolymerization reaction and for a geopolymerized fly ash. The geopolymerized fly ash is granulated. The geopolymerized fly ash is considered usable fly ash for concrete according to foam index testing. The geopolymerized fly ash may have a foam index less than 35% of the foam index of the untreated fly ash, and in some cases less than 10% of the foam index of the untreated fly ash. The activator solution may contain an alkali metal hydroxide, carbonate, silicate, aluminate, or mixtures thereof.

L'invention concerne un procédé de traitement de cendres volantes en vue de les rendre fortement utilisables comme additif de béton. Le procédé consiste à obtenir une quantité de cendres volantes contenant du carbone et dont l'indice de moussabilité les rend inutilisables dans du béton; à mélanger les cendres volantes à une solution d'activation suffisante pour déclencher une réaction de géopolymérisation et créer des cendres volantes géopolymérisées; à granuler les cendres volantes géopolymérisées. L'indice de moussabilité des cendres volantes géopolymérisées ainsi produites les rend utilisables dans du béton. Leur indice de moussabilité est inférieur par 35 % à celui des cendres volantes non traitées et, dans certains cas, par 10 %. La solution d'activation peut contenir un hydroxyde de métal alcalin, du carbonate, du silicate, de l'aluminate ou des mélanges de ceux-ci.

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