Apparatus and methods for producing gypsum wallboard
US-9745222-B2 · Aug 29, 2017 · US
Compositions with synthetic gypsum and methods
US9944556B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9944556-B2 |
| Application number | US-201414514961-A |
| Country | US |
| Kind code | B2 |
| Filing date | Oct 15, 2014 |
| Priority date | Oct 15, 2014 |
| Publication date | Apr 17, 2018 |
| Grant date | Apr 17, 2018 |
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Abstract
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DTPA-coated synthetic calcined gypsum is provided with alpha-like properties and obtained by spray-coating the synthetic caclined gypsum with DTPA. Cementitious compositions comprising DTPA-coated synthetic calcined gypsum and low water demand are provided as well. Methods for controlling an open time of a cementitious slurry by increasing or decreasing the amount of DTPA-coated synthetic calcined gypsum in the slurry are provided as well.
First claim
Opening claim text (preview).
What is claimed is: 1. A cementitious composition comprising DTPA-coated synthetic beta calcined gypsum, water and alpha calcined gypsum, and wherein the amount of water in the composition is no more than 50 cc for 100 parts of all gypsum combined; and wherein DTPA-coated synthetic beta calcined gypsum comprises from 25% to 85% of all gypsum combined in the composition, based on the dry weight. 2. The cementitious composition of claim 1 , wherein the alpha calcined gypsum is spray coated with DTPA. 3. The cementitious composition of claim 1 , wherein the DTPA-coated synthetic beta calcined gypsum comprises 25% of all gypsum in the composition, based on the dry weight. 4. The cementitious composition of claim 1 , wherein the composition further comprises at least one type of cement. 5. The cementitious composition of claim 1 , wherein the cement is selected from the group consisting of white cement, grey PORTLAND type cement, imp milled cement and class C cement. 6. The cementitious composition of claim 1 , wherein the composition further comprises a compound selected from the group consisting of fly ash, slag cement and silica fume. 7. The cementitious composition of claim 5 , wherein the composition further comprises a compound selected from the group consisting of fly ash, slag cement and silica fume.
Assignees
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Use of waste materials as fillers for mortars or concrete · CPC title
Slags · CPC title
Acids or salts thereof · CPC title
containing synthetic or waste calcium sulfate cements · CPC title
- C04B11/00Primary
Calcium sulfate cements · CPC title
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- What does patent US9944556B2 cover?
- DTPA-coated synthetic calcined gypsum is provided with alpha-like properties and obtained by spray-coating the synthetic caclined gypsum with DTPA. Cementitious compositions comprising DTPA-coated synthetic calcined gypsum and low water demand are provided as well. Methods for controlling an open time of a cementitious slurry by increasing or decreasing the amount of DTPA-coated synthetic calci…
- Who is the assignee on this patent?
- United States Gypsum Co
- What technology area does this patent fall under?
- Primary CPC classification C04B11/00. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Apr 17 2018 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).