Concrete mixture which yields concrete having high strength...

Details Concrete mixture which yields concrete having high strength... Concrete mixture which yields concrete having high strength...

C - Chemistry, Metallurgy

04

B

C04B 24/20 (2006.01) C04B 28/02 (2006.01) C04B 38/10 (2006.01)

Patent

CA 2248334

The present invention relates to an aqueous concrete mixture having an air pore volume between 10 and 85 %, preferably between 20 and 85 %. When curing, a concrete having uniform density and high strength is obtained. This is achieved by using an aqueous, anionic surface-active compound containing two sulphonic acid groups of the general formula (I) (R)m-R1-(SO3M)2, wherein R is an aliphatic group having 4-20 carbon atoms, m is a number 1 or 2, the sum of the number of carbon atoms in the group or in the groups R being 6-30, R1 is an aromatic group containing at least 2 aromatic rings and 10-20 carbon atoms, and M is a cation or hydrogen. The anionic compound has an air-entraining effect and improves the homogeneity of the concrete mixture.

La présente invention se rapporte à un mélange de béton aqueux dont la porosité en air est comprise entre 10 et 85 %, de préférence entre 20 et 85 %. Lors du durcissement, on obtient un béton de densité uniforme et à haute résistance. Ceci est obtenu par utilisation d'un composé tensioactif anionique et, aqueux renfermant deux groupes d'acides sulfoniques de la formule générale (R)¿m?-R¿1?-(SO¿3?M)¿2?, dans laquelle R représente un groupe aliphatique possédant de 4 à 20 atomes de carbone, m est égal à 1 ou 2, la somme des atomes de carbone dans le ou les groupes R étant comprise entre 6 et 30, R¿1? représente un groupe aromatique renfermant au moins 2 noyaux aromatiques et 10 à 20 atomes de carbone, et M représente un cation ou hydrogène. Le composé anionique produit un effet d'entraînement de l'air et améliore l'homogénéité du mélange de béton.

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