Composition based on calcium oxide

Patent metadata

Field	Value
Publication number	US-10793471-B2
Application number	US-201716083467-A
Country	US
Kind code	B2
Filing date	Mar 21, 2017
Priority date	Mar 22, 2016
Publication date	Oct 6, 2020
Grant date	Oct 6, 2020

Abstract

A composition, in particular a setting accelerator for mineral binders, containing or being made of: a) calcium oxide in the particle form; b) an inhibitor for the reaction of calcium oxide with water and c) optionally water.

First claim

The invention claimed is:

1. A composition comprising:
a) calcium oxide in particle form,
b) an inhibitor for the reaction of calcium oxide with water and
c) water; wherein
the composition is present as a slurry or suspension and contains based on the total weight of the composition:
25-75% by weight of the calcium oxide;
0.5-10% by weight of the inhibitor, the inhibitor being a phosphoric acid ester of a polyhydric alcohol; and
25-75% by weight of the water.

2. The composition as claimed in claim 1 , wherein the composition is present as either an aqueous suspension that is storage-stable for at least 5 minutes or an aqueous slurry that is storage-stable for at least 5 minutes.

3. The composition as claimed in claim 1 , wherein the phosphoric acid ester is selected from among glyceryl phosphate, disodium glyceryl phosphate and/or a hydrate thereof.

4. The composition as claimed in claim 1 , wherein the calcium oxide has a specific surface area of 1-50 m 2 /g of calcium oxide.

5. The composition as claimed in claim 1 , wherein the composition is present as either an aqueous slurry that is storage-stable for at least 60 minutes or an aqueous suspension that is storage-stable for at least 60 minutes.

6. The composition as claimed in claim 1 further comprising at least one alkali metal carbonate.

7. The composition as claimed in claim 1 , wherein the composition is present in the form of an at least two-component composition, with the calcium oxide, the inhibitor and the water being present in a first component while further constituents of the composition are present together in a second component or are present separately from one another as further individual components.

8. The composition as claimed in claim 1 , further comprising a mineral binder composition.

9. The composition as claimed in claim 8 , wherein the mineral binder composition contains at least one mineral binder and, in each case based on the binder content:
a) calcium oxide in a proportion of from 0.001 to 10% by weight;
b) a phosphoric acid ester of a polyhydric alcohol in an amount of from 0.001 to 5% by weight;
c) optionally a carbohydrate in an amount of 0.001-1% by weight; and
d) optionally an alkali metal carbonate in an amount of from 0.001 to 6% by weight.

10. A molding obtained by curing a composition as claimed in claim 8 after addition of water.

11. A process for producing a composition as claimed in claim 8 wherein a composition containing: calcium oxide in particle form, an inhibitor for the reaction of calcium oxide with water, the inhibitor being a phosphoric acid ester of a polyhydric alcohol, and water, is mixed with at least one constituent of a binder composition.

12. A method for accelerating the setting and/or curing of a mineral binder and/or a mineral binder composition, said method comprising adding a composition as claimed in claim 1 to the mineral binder and/or the mineral binder composition, and then setting and/or curing the mineral binder and/or the mineral binder composition.

13. The method as claimed in claim 12 , wherein the mineral binder and/or the mineral binder composition is of a spray concrete composition.

14. The method as claimed in claim 12 , wherein the composition is added to the mineral binder composition in an amount effective to increase the compressive strength of the mineral binder composition after 6 minutes from the time that the composition was added.

15. The method as claimed in claim 12 , wherein the setting and/or the curing occurs at temperatures above 50° C. and/or at pressures of more than 1.5 bar.

16. A method comprising:
adding a phosphoric acid ester of a polyhydric alcohol to a composition containing calcium oxide in particle form and water, the phosphoric acid ester being added in an amount effective to stabilize the composition and/or inhibit the reaction of calcium oxide with water; wherein
the addition of the effective amount of phosphoric acid ester results in a composition that is present as slurry or suspension and contains based on the total weight of the composition:
25-75% by weight of the calcium oxide;
0.5-10% by weight of the phosphoric acid ester; and
25-75% by weight of the water.

17. The method as claimed in claim 16 , wherein
the addition of the effective amount of phosphoric acid ester to the composition maintains the stability of the slurry or the suspension over a period of time of at least 5 minutes, and/or
the addition of the effective amount of phosphoric acid ester to the composition controls the inhibition of the reaction of the calcium oxide with the water such that over a period of time of at least 5 minutes the amount of the calcium oxide comprised in the composition does not decrease by more than 10% by weight.

Assignees

• Sika Tech Ag

Inventors

• Bürge Christian
• Mäder Gilbert
• Wombacher Franz

Classifications

• Y02W30/91

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

• C09K8/467

  containing additives for specific purposes · CPC title

• C04B40/00

  Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability (active ingredients C04B22/00 - C04B24/00; hardening of a well-defined composition C04B26/00 - C04B28/00; making porous, cellular or lightening C04B38/00; mechanical aspects B28, e.g. conditioning the materials prior to shaping B28B17/02) · CPC title

• C04B28/02 Primary

  containing hydraulic cements other than calcium sulfates · CPC title

• C04B22/16

  containing phosphorus in the anion, e.g. phosphates · CPC title