Gypsum composites containing cementitious materials and methods

Patent metadata

Field	Value
Publication number	US-9932271-B2
Application number	US-201414560571-A
Country	US
Kind code	B2
Filing date	Dec 4, 2014
Priority date	Dec 6, 2013
Publication date	Apr 3, 2018
Grant date	Apr 3, 2018

Abstract

Gypsum composites containing cementitious materials and methods of making the same are provided. Gypsum composites include gypsum and a cementitious material. Methods of making gypsum composites include combining gypsum stucco, water, and a cementitious material to form a slurry, and setting and drying the slurry to form a gypsum composite.

First claim

What is claimed is:

1. A method of making a gypsum composite, comprising:
combining beta hemihydrate gypsum stucco, water, and a cementitious material to form a slurry comprising the cementitious material in an amount from 0.7 percent to 1.5 percent by dry weight; and
setting and drying the slurry to form a gypsum composite comprising a gypsum panel,
wherein the slurry comprises water in an amount from about 50 percent to about 100 percent by weight of dry components,
wherein setting and drying the slurry comprises curing the slurry between two facer mats.

2. The method of claim 1 , wherein the cementitious material is selected from the group consisting of: calcium silicate cements, calcium aluminate cements, calcium sulfoaluminate cements, phosphate cements, magnesium oxychloride cements, magnesium oxysulfate cements, magnesium phosphate cements, quick set cements, and combinations thereof.

3. The method of claim 1 , wherein the cementitious material comprises Portland cement Type III.

4. The method of claim 1 , wherein the cementitious material comprises quick lime or hydrated lime.

5. The method of claim 1 , wherein combining gypsum stucco, water, and cementitious material comprises first combining the cementitious material and the gypsum stucco to form a dry mix and subsequently combining the dry mix with the water.

6. The method of claim 1 , wherein the step of combining gypsum stucco, water, and the cementitious material to form the slurry further comprises combining one or more accelerators, dispersants, retarders, seeding materials, or combinations thereof, with the gypsum stucco, water, and cementitious material.

7. The method of claim 1 , wherein the step of combining gypsum stucco, water, and the cementitious material to form a slurry further comprises combining silica fume, diatomaceous earth, pumice, flyash, slag, colloidal silica, sodium silicates, aluminates, aluminum hydroxide, or a combination thereof, with the gypsum stucco, water, and cementitious material.

8. The method of claim 1 , wherein the step of combining gypsum stucco, water, and the cementitious material to form the slurry further comprises combining glass fibers, polymer fibers, cellulose fibers, other natural fibers, or a combination thereof, with the gypsum stucco, water, and cementitious material.

9. The method of claim 1 , wherein the two facer mats comprise paper mats.

10. The method of claim 1 , wherein the two facer mats comprise non-woven glass mats.

11. The method of claim 1 , wherein the cementious material comprises Portland cement.

Assignees

• Georgia Pacific Gypsum Llc

Inventors

• Teng Yi-Hsien Harry
• Leavitt Mark Alexander
• Fields Jeffrey T
• Thomas Vincent B

Classifications

• Y02W30/91

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

• C04B22/143

  Calcium-sulfate · CPC title

• C04B28/145 Primary

  Calcium sulfate hemi-hydrate with a specific crystal form · CPC title

• C04B20/0048

  Fibrous materials · CPC title

• C04B14/16

  porous, e.g. pumice · CPC title