Concrete mixtures having high flowability
DCFirst Claim
1. A flowable concrete mixture, comprising:
- (i) a hydraulic cement;
(ii) an aggregate(iii) water;
(iv) a foam admixture comprising a viscosity modifier, water, a surfactant, and a plurality of air bubbles, 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 water and/or a water reducer to give the concrete mixture a flow spread greater than 10 inches.
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Abstract
A viscosity modifying agent is added to a concrete mixture to give the concrete desirable rheological properties. The viscosity modifying agent is incorporated into a foam admixture before it is mixed into the concrete. Because the viscosity modifying agent is a component of the foam admixture, the viscosity modifying agent is dispersed in the aqueous film that forms the foam bubbles. The viscosity modifier in the foam bubbles gives the foam beneficial rheological properties. The viscosity modifier performs more efficiently when included in the foam bubbles as compared to being mixed directly into the concrete. The foam bubbles containing the viscosity modifier can be stabilized using a fluorochemical stabilizer, which is included in the foam admixture. The foam bubbles can be further stabilized with respect to cement mixtures by including a hydration stabilizing in the cement mixture.
36 Citations
31 Claims
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1. A flowable concrete mixture, comprising:
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(i) a hydraulic cement; (ii) an aggregate (iii) water; (iv) a foam admixture comprising a viscosity modifier, water, a surfactant, and a plurality of air bubbles, 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 water and/or a water reducer to give the concrete mixture a flow spread greater than 10 inches. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 20)
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14. A concrete mixture, comprising:
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(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. - View Dependent Claims (15, 16, 17, 18, 19, 21)
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22. A flowable concrete mixture, comprising:
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(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. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31)
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Specification