Stabilized aqueous suspension for initiating setting and hardening of aluminous cement compositions

Patent metadata

Field	Value
Publication number	US-10822284-B2
Application number	US-201615764295-A
Country	US
Kind code	B2
Filing date	Oct 19, 2016
Priority date	Oct 20, 2015
Publication date	Nov 3, 2020
Grant date	Nov 3, 2020

Abstract

A long-term stabilized aqueous initiator composition, which includes components for curing of a two-component mortar system composition. The long-term stabilized aqueous initiator composition includes an activator component that has an alkali and/or alkaline earth metal salt, an accelerator component that has a water-soluble alkali and/or alkaline earth metal salt, a retarder selected from citric acid, tartaric acid, lactic acid, salicylic, gluconic acid, and a mixture of these components, a mineral filler selected from a limestone filler, corundum, dolomite, alkaline-resistant glass, crushed stone, gravel, pebble, and a mixture of these components, a thickening agent, and water.

First claim

The invention claimed is:

1. A stabilized aqueous initiator composition, comprising:
0.1 wt.-% to 4 wt.-% of an activator component lithium hydroxide,
0.1 wt.-% to 5 wt.-% of an accelerator component-lithium sulfate or lithium sulfate monohydrate,
0.05 wt.-% to 5 wt.-% of a retarder citric acid,
0.05 wt.-% to 4 wt.-% of a retarder tartaric acid,
35 wt.-% to 45 wt.-% of a first mineral filler selected from the group consisting of a limestone filler, corundum, dolomite, alkaline-resistant glass, crushed stone, gravel, pebble, and a mixture thereof,
15 wt.-% to 25 wt.-% of a second mineral filler selected from the group consisting of a limestone filler, corundum, dolomite, alkaline-resistant glass, crushed stone, gravel, pebble, and a mixture thereof,
10 wt.-% to 20 wt.-% of a third mineral filler selected from the group consisting of a limestone filler, corundum, dolomite, alkaline-resistant glass, crushed stone, gravel, pebble, and a mixture thereof,
0.01 wt.-% to 0.5 wt.-% of at least one thickening agent, and
15 wt.-% to 25 wt.-% of water
wherein said composition does not set or harden after one week.

2. The stabilized aqueous initiator composition according to claim 1 , wherein at least one mineral filler has an average particle size of not more than 500 micron.

3. The stabilized aqueous initiator composition according to claim 1 , wherein
at least one mineral filler is a limestone filler or a mixture of at least two limestone fillers.

4. The stabilized aqueous initiator composition according claim 1 , wherein
the aqueous initiator composition has a shelf life of at least six months.

5. The stabilized aqueous initiator composition according claim 1 , wherein
the aqueous initiator composition is in form of a slurry or paste.

6. The stabilized aqueous initiator composition according to claim 1 , wherein
the aqueous initiator composition has a pH-value of above 10.

7. The stabilized aqueous initiator composition according to claim 1 , wherein
the first mineral filler, the second mineral filler, and the third mineral filler are a calcium carbonate fine.

8. A method for preparing the stabilized aqueous initiator composition according to claim 1 , the method comprising:
i) introducing water into a mixing tank,
ii) dissolving and adding at least one activator component and the at least one accelerator component under stirring,
iii) dissolving and adding at least one retarder to this mixture,
iv) adding stepwise at least one mineral filler whilst increasing stirring speed,
v) adding thickening agent, and
vi) continuing stirring until complete homogenization.

9. A method for activating the setting and hardening of a curable aqueous-phase aluminous cement component, comprising:
mixing the stabilized aqueous initiator composition according to claim 1 with the curable aqueous-phase aluminous cement component.

10. A mortar system, comprising:
the stabilized aqueous initiator composition according to claim 1 ; and
a curable aqueous-phase aluminous cement component.

11. The mortar system according to claim 10 , which is a two-component system comprising:
a first component; and
a second component, wherein
the first component comprises the stabilized aqueous initiator composition.

12. The mortar system according to claim 11 , which has an initial set time of at least 5 minutes.

13. A method of chemically fastening an anchor in a mineral surface, the method comprising:
setting the anchor in the mineral surface in the presence of the stabilized aqueous initiator composition according to claim 1 ; and
curing a two-component mortar system comprising:
a first component; and
a second component, wherein
the first component comprises said stabilized aqueous initiator composition.

14. The method according to claim 13 , wherein
the anchor is at least one member selected from the group consisting of an anchor rod, a threaded anchor rod, a bolt, and a steel reinforcement bar.

15. The method according to claim 13 , wherein
the mineral surface is at least one member selected from the group consisting of brickwork, concrete, pervious concrete, and natural stone.

16. The stabilized aqueous initiator composition according to claim 1 , wherein said accelerator is present in an amount of at least 1.0 wt. %.

Assignees

• Hilti Ag

Inventors

• Pfeil Armin
• Beroll Pascal

Classifications

• C04B2111/00715

  for fixing bolts or the like · CPC title

• C04B40/0633

  Chemical separation of ingredients, e.g. slowly soluble activator · CPC title

• C04B14/28

  of calcium · CPC title

• C04B2103/44

  Thickening, gelling or viscosity increasing agents · CPC title

• C04B22/062

  of the alkali or alkaline-earth metals · CPC title