US 7,972,436 B2 · Air management in cementitious mixtures having plasticizer and a clay-activity modifying agent

Abstract

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) 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.

Claims21

Dependent claims

A hydratable cementitious composition containing a cementitious binder and an admixture composition, said admixture composition comprising:

a plasticizer for modifying a cementitious composition;
a first surface active agent comprising a betaine, an alkyl sulfonate, an aryl sulfonate, an alkylaryl sulfonate, or a mixture thereof;
and a second surface active agent comprising a nonionic oxyalkylene-containing polymer surfactant represented by at least one of the formulae “A” through “D”:
wherein x and x′ independently represent an integer of from 1 to 140;
and y represents an integer of from 15-70;
wherein v and v′ independently represent an integer of from 9 to 27;
and w represents an integer of from 4 to 232;
wherein q, q′, q″, and q′″ independently represent an integer of from 4 to 31;
and r, r′, r″, and r′″ independently represent an integer of from 2 to 140;
and
wherein m, m′, m″, and m′″ independently represent an integer of from 1 to 95;
and n, n′, n″, and n′″ independently represent an integer of from 8 to 32.

9 more elements

Dependencies are inferred from the claim text.

Air management in cementitious mixtures having plasticizer and a clay-activity modifying agent

Life of this patent

Air management in cementitious mixtures having plasticizer and a clay-activity modifying agent

Life of this patent

Abstract

Claims21