Concrete mixtures having high flowability

A concrete mixture, comprising:

• (i) a hydraulic cement;
• (ii) water;
• (iii) an aggregate;
• (iv) a foam comprising a viscosity modifier, water, a fluorochemical surfactant, and a plurality of air bubbles that are stabilized by the fluorochemical surfactant, the fluorochemical surfactant comprising an oligomer having at least one hydrophilic nonionic monomer and at least one hydrophilic anionic monomer, wherein the concentration of the viscosity modifier is higher in the foam admixture compared to the remainder of the flowable concrete mixture;
• and
• (v) a sufficient amount of a water reducing agent to give the concrete a flow spread of at least about 12 inches, wherein the flow spread is substantially homogenous.

A flowable concrete mixture, comprising:

• (i) a hydraulic cement;
• (ii) an aggregate
• (iii) water;
• (iv) a hydration stabilizer that inhibits hydration of the hydraulic cement;
• (iv) a foam admixture comprising a viscosity modifier, water, and a plurality of air bubbles, wherein the foam admixture is stabilized in the presence of the hydraulic cement by the hydration stabilizer, wherein the concentration of the viscosity modifier is higher in the foam admixture compared to the remainder of the flowable concrete mixture;
• (v) wherein the concrete mixture includes less than 12 oz/(100 lbs cement) of a viscosity modifier in addition to the viscosity modifier in the foam admixture.