Methods of reducing hydroxyl ions in concrete pore solutions

Details Methods of reducing hydroxyl ions in concrete pore solutions Methods of reducing hydroxyl ions in concrete pore solutions

C - Chemistry, Metallurgy

04

B

C04B 14/04 (2006.01)

Patent

CA 2578237

Methods of reducing hydroxyl ions in concrete pore solutions are provided. Such methods are useful in providing resistance to gels which form in concrete due to the alkali-silica (ASR) reaction. The methods comprise, in one aspect, adding a salt to the concrete, in aqueous or solid form, the salt having a cation higher in valence than the anion. In other aspects, the methods of the present invention comprise adding an acidic phosphate or a silicon-containing alkoxide to the concrete. All of the above methods are useful in reducing hydroxyl ions in concrete. Such methods can be used to resist ASR in fresh concrete, in concrete that is setting, or in hardened concrete.

L'invention concerne des méthodes de réduction d'ions hydroxyle dans des solutions interstitielles de béton. De telles méthodes sont utiles pour obtenir une résistance aux gels qui forment le béton grâce à la réaction alcali-silice (ASR). Ces méthodes consistent à, dans un aspect de l'invention, ajouter un sel au béton, sous forme aqueuse ou solide, ce sel présentant un cation plus élevé en valence que l'anion. Dans d'autres aspects de l'invention, ces méthodes consistent à ajouter un phosphate acide ou un alcoxyde contenant le silicium au béton. Toutes les méthodes susmentionnées sont utiles pour réduire des ions hydroxyle dans du béton. De telles méthodes peuvent être utilisées pour résister à l'ASR dans du béton frais, dans du béton en train de prendre, ou dans du béton durci.

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