Composition based on calcium oxide

Patent metadata

Field	Value
Publication number	US-2019084880-A1
Application number	US-201716083467-A
Country	US
Kind code	A1
Filing date	Mar 21, 2017
Priority date	Mar 22, 2016
Publication date	Mar 21, 2019
Grant date	—

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

1 . A composition comprising:
a) calcium oxide in particle form, b) an inhibitor for the reaction of calcium oxide with water and c) optionally water.

2 . The composition as claimed in claim 1 , wherein the composition is present as aqueous suspension or slurry.

3 . The composition as claimed in claim 1 , wherein the inhibitor is selected from among phosphoric acid esters of a polyhydric alcohol and/or from among carbohydrates.

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

5 . The composition as claimed in claim 3 , wherein the at least one inhibitor comprises a carbohydrate comprising at least one representative of the group consisting of fructose, sucrose, glucose, lactose, mannose, ribose, galactose, fucose, rhamonose, lactulose, maltose, trehalose, melezitose, raffinose, molasses, caramel and umbelliferose.

6 . 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.

7 . The composition as claimed in claim 1 , wherein the composition contains the following constituents, in each case based on the total weight of the composition:
a) 25-75% by weight of calcium oxide; b) 0.1-15% by weight of the inhibitor for the reaction of calcium oxide with water; and c) optionally 25-75% by weight of water; where the composition is present as slurry or suspension.

8 . The composition as claimed in claim 1 , wherein the composition is present as slurry or suspension and contains the following constituents, in each case based on the total weight of the composition:
a) 25-75% by weight of calcium oxide; b) 0.5-10% by weight of a phosphoric acid ester of a polyhydric alcohol; and c) 25-75% by weight of water.

9 . The composition as claimed in claim 1 containing at least one alkali metal carbonate.

10 . 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 optionally 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.

11 . The composition as claimed in claim 1 , additionally containing a component of a mineral binder composition.

12 . The binder composition as claimed in claim 11 containing 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;
d) optionally an alkali metal carbonate in an amount of from 0.001 to 6% by weight.

13 . A molding obtainable by curing a composition as claimed in claim 11 after addition of water.

14 . A process for producing a composition as claimed in claim 11 wherein a composition containing: calcium oxide in particle form, an inhibitor for the reaction of calcium oxide with water and optionally water, is mixed with at least one constituent of a binder composition.

15 . A method comprising accelerating the setting and/or curing of mineral binders and/or binder compositions with a composition as claimed in claim 1 .

16 . The method as claimed in claim 15 , wherein the composition is used for accelerating the setting and/or curing of spray concrete compositions.

17 . The method as claimed in claim 15 , wherein the composition is used for increasing the compressive strength of a mineral binder composition after 6 minutes.

18 . The method as claimed in claim 15 at temperatures above 50° C., and/or pressures more than 1.5 bar.

19 . The method as claimed in claim 15 in deep wells, extra-deep wells, well drill holes and/or in boreholes.

20 . A method comprising stabilizing a composition containing calcium oxide and water and/or for inhibiting the reaction of calcium oxide with water, with a phosphoric acid ester of a polyhydric alcohol and/or of a carbohydrate.

21 . The method as claimed in claim 20 , wherein the phosphoric acid ester of a polyhydric alcohol and/or the carbohydrate is used for controlling the stability over time of a composition containing calcium oxide and water and/or for controlling the inhibition of the reaction of calcium oxide with water over time.

Assignees

• Sika Tech Ag

Inventors

• Bürge Christian
• Mäder Gilbert
• Wombacher Franz

Classifications

• C04B24/10

  Carbohydrates or derivatives thereof · CPC title

• C09K8/467

  containing additives for specific purposes · CPC title

• C04B28/02 Primary

  containing hydraulic cements other than calcium sulfates · CPC title

• C04B2103/12

  Set accelerators · CPC title

• C04B2103/0092

  for improving green strength · CPC title