U

L. u. b. If air content is lower than the desired level, i.

n, v. e. n, t, i.

o. n. These surface active agents typically have an alkyl ethoxylate composition and can be mixed into a plastic hydratable cementitious mix.

Alkyl alkoxylate based surface active agents have proven to be particularly effective when combined with polycarboxylate type cement dispersants. These polycarboxylate-type dispersants are characterized by their low number average molecular weights (HLB) ntawm 0.5 rau 5 n.

Various embodiments of the present invention involve the addition of an alkyl ethoxylate based surface active agent or an air entraining agent to a plastic hydratable cementitious mixture. The exemplary alkyl ethoxylate surface active agents can have between three and fifteen ethoxylate groups, optionally less than two propoxylate groups.

Plastic concrete mixes contain a mixture of a cementitious binder, fine and coarse aggregate, thiab additives. Typical cementitious binder is ordinary Portland cement. However, it can also be blended with other materials.