Air management in cementitious mixtures having plasticizer...

C - Chemistry – Metallurgy – 04 – B

Patent

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Details

C04B 24/16 (2006.01) C04B 24/12 (2006.01)

Patent

CA 2401147

An exemplary surface active agent admixture composition of the invention comprises (1) a first surface active agent comprising a betaine, an alkyl or aryl or alkylaryl sulfonate, or mixture thereof; and (2) a second surface active agent comprising a nonionic oxyalkylene-containing polymer surfactant. The present invention therefore provides a system for ensuring the presence in a hydratable cementitious composition (when hardened) of a sufficient air volume and sufficient air void fineness and consistency. Further exemplary admixture compositions may comprise one or more plasticizers and one or more clay activity-modifying agents. Cementitious compositions and methods for modifying cementitious compositions, which incorporate the above-mentioned surface active agent combination, are also described. The invention provides the ability to adjust and stabilize air void systems in hydratable cementitious compositions, while allowing conventional air entraining agent (AEA) dosage practices to be followed.

Une compositions d'adjuvant tensio-actif exemplaire de l'invention comprend (1) un premier agent tensio-actif renfermant de la bétaïne, du sulfonate d'alkyle ou d'aryle ou d'aralkyle, ou un mélange de ces composés, et (2) un second agent tensio-actif renfermant un tensio-actif polymérique à base d'oxyalkylène non ionique. La présente invention concerne par conséquent un système permettant d'assurer, dans une composition hydratable à base de ciment (lorsqu'elle est durcie), un volume d'air, une finesse de bulles d'air et une consistance suffisants. D'autres compositions d'adjuvants exemplaires peuvent comprendre un ou plusieurs plastifiants et un ou plusieurs agents de modification de l'activité de l'argile. L'invention concerne également des compositions à base de ciment et des procédés permettant de modifier des compositions à base de ciment, comprenant les mélanges d'agents tensio-actifs décrits ci-dessus. Cette invention permet d'ajuster et de stabiliser les réseaux de bulles d'air dans des compositions hydratables à base de ciment, tout en respectant les procédés classiques de dosage à agent d'entraînement d'air (AEA).

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