Admixture and method for freeze-thaw damage resistance and scaling damage resistance of cementitious compositions

Patent metadata

Field	Value
Publication number	US-10774000-B2
Application number	US-201615019294-A
Country	US
Kind code	B2
Filing date	Feb 9, 2016
Priority date	Apr 19, 2012
Publication date	Sep 15, 2020
Grant date	Sep 15, 2020

Abstract

A freeze-thaw damage resistance and scaling damage resistance admixture for a cementitious composition including an aqueous slurry comprising a water insoluble superabsorbent polymer and expandable polymeric microspheres. A method for preparing a freeze-thaw damage resistant and scaling damage resistant cementitious composition including forming a mixture of a hydraulic cement and an admixture including an aqueous slurry of a water insoluble superabsorbent polymer and expanded polymeric microspheres.

First claim

What is claimed is:

1. A freeze-thaw damage resistance and scaling damage resistance admixture for a cementitious composition comprising a stabilized aqueous slurry comprising water insoluble superabsorbent polymer particles in an amount from 0.1 to 30 percent by weight, based on the total weight of ingredients of the admixture other than water, and unexpanded, expandable polymeric microspheres in an amount from 50 to 99.9 percent by weight, based on the total weight of ingredients of the admixture other than water, and wherein the expanded polymeric microspheres have an average diameter of from about 24 μm to about 900 μm.

2. The admixture of claim 1 , wherein the polymeric microspheres comprise a polymer that is at least one of polyethylene, polypropylene, polymethyl methacrylate, poly-o-chlorostyrene, polyvinyl chloride, polyvinylidene chloride, polyacrylonitrile, polymethacrylonitrile, polystyrene, or copolymers or mixtures thereof.

3. The admixture of claim 1 , wherein the polymeric microspheres comprise at least one copolymers of vinylidene chloride-acrylonitrile, polyacrylonitrile-copolymethacrylonitrile, polyvinylidene chloride-polyacrylonitrile, or vinyl chloride-vinylidene chloride, or mixtures thereof.

4. The admixture of claim 1 , wherein the water insoluble superabsorbent polymer comprises at least one cross-linked polyelectrolyte.

5. The admixture of claim 4 , wherein the at least one cross-linked polyelectrolyte is at least one of cross-linked polyacrylic, cross-linked polyacrylamide, or covalently cross-linked acrylamide/acrylic acid copolymers.

6. The admixture of claim 1 , wherein the water insoluble superabsorbent polymer comprises water insoluble superabsorbent polymer particles, and wherein the average size of the water insoluble superabsorbent polymer particles is from about 5 μm to about 1,000 μm.

7. The admixture of claim 1 , wherein the average size of the water insoluble superabsorbent polymer particles is from about 5 μm to about 300 μm.

8. The admixture of claim 1 , wherein the expanded polymeric microspheres have an average diameter of from about 36 μm to about 900 μm.

9. The admixture of claim 1 , wherein the expanded polymeric microspheres have an average diameter of from about 24 μm to about 216 μm.

10. The admixture of claim 1 , wherein the expanded polymeric microspheres have an average diameter of from about 36 μm to about 216 μm.

11. A freeze-thaw damage resistant and/or scaling damage resistant cementitious composition comprising hydraulic cement and an admixture, wherein the admixture comprises a stabilized aqueous slurry comprising water insoluble superabsorbent polymer particles in an amount from 0.1 to 30 percent by weight, based on the total weight of ingredients of the admixture other than water, and expanded polymeric microspheres in an amount from 50 to 99.9 percent by weight, based on the total weight of ingredients of the admixture other than water, wherein the expanded polymeric microspheres have an average diameter of from about 24 μm to about 900 μm.

12. The cementitious composition of claim 11 , comprising from 0.2 to 4 percent by volume expanded polymeric microspheres, based on the total volume of the cementitious composition.

13. The cementitious composition of claim 11 , comprising from 0.25 to 3 percent by volume expanded polymeric microspheres, based on the total volume of the cementitious composition.

14. The cementitious composition of claim 11 , comprising from 0.002 to 0.1 percent by volume water insoluble superabsorbent polymer, based on the total volume of the cementitious composition.

15. The cementitious composition of claim 11 , comprising from 0.008 to 0.08 percent by volume water insoluble superabsorbent polymer, based on the total volume of the cementitious composition.

16. The cementitious composition of claim 11 , comprising from 0.002 to 0.06 percent by weight expanded polymeric microspheres, based on the total weight of the cementitious composition.

17. The cementitious composition of claim 11 , comprising from 0.00002 to 0.02 percent by weight water insoluble superabsorbent polymer, based on the total weight of the cementitious composition.

Assignees

• Construction Research & Technology Gmbh

Inventors

• Ong Frank Shaode
• Smith James C
• Fete Raymond
• Paponetti Rick

Classifications

• C04B28/02 Primary

  containing hydraulic cements other than calcium sulfates · CPC title

• C04B38/08

  by adding porous substances · CPC title

• C04B16/08

  porous, e.g. expanded polystyrene beads {or microballoons} · CPC title

• Y02W30/91

  Use of waste materials as fillers for mortars or concrete · CPC title

• A61L15/60 Primary

  Liquid-swellable gel-forming materials, e.g. super-absorbents · CPC title