Concrete mixtures having aqueous foam admixtures
DCFirst Claim
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1. A concrete mixture, comprising:
- (i) a hydraulic cement;
(ii) a hydration stabilizer that inhibits hydration of the hydraulic cement, the hydration stabilizer including a set retarder and an accelerator;
(iii) water;
(iv) a foam admixture comprising water and a fluorochemical surfactant, wherein the foam is stabilized in the presence of the hydraulic cement by the hydration stabilizer.
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Abstract
Flowable concrete mixtures have an aqueous foam admixture mixed therein to give the concrete mixture desired strength, flowability, and density. The concrete mixtures include a hydration stabilizer to stabilize the aqueous foam. The hydration stabilizer inhibits the reaction between the hydraulic cement and the water in the aqueous foam. The aqueous foam can be further stabilized using a fluorochemical surfactant. Preferred fluorochemical surfactants comprise an oligomer having at least one hydrophilic nonionic monomer and at least one hydrophilic anionic monomer.
36 Citations
42 Claims
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1. A concrete mixture, comprising:
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(i) a hydraulic cement; (ii) a hydration stabilizer that inhibits hydration of the hydraulic cement, the hydration stabilizer including a set retarder and an accelerator; (iii) water; (iv) a foam admixture comprising water and a fluorochemical surfactant, wherein the foam is stabilized in the presence of the hydraulic cement by the hydration stabilizer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 40, 41)
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17. A concrete mixture, comprising:
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(i) a hydraulic cement; (ii) a hydration stabilizer that inhibits hydration of the hydraulic cement, the hydration stabilizer including a set retarder and an accelerator; (iii) water; (iv) a dispersant; (v) aggregate; and (vi) a foam comprising water, a nonionic surfactant, and a fluorochemical surfactant, wherein the foam comprises 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 or at least one hydrophilic anionic monomer. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25)
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26. A method for stabilizing a foam in a concrete mixture, comprising:
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(i) providing an aqueous foam admixture comprising water, a fluorochemical surfactant, and a plurality of air bubbles; (i) providing a cementitious mixture comprising hydraulic cement, water, and aggregate; and (iii) mixing together the cementitious mixture, the aqueous foam admixture and a hydration stabilizer, wherein the hydration stabilizer includes a set retarder and an accelerator, the hydration stabilizer inhibiting the destruction of the air bubbles by the hydraulic cement. - View Dependent Claims (27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 42)
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Specification