Use of calcium sulfate in an inorganic mortar system based on aluminous cement to increase load values

Patent metadata

Field	Value
Publication number	US-11214526-B2
Application number	US-201615765509-A
Country	US
Kind code	B2
Filing date	Oct 19, 2016
Priority date	Oct 20, 2015
Publication date	Jan 4, 2022
Grant date	Jan 4, 2022

Abstract

An inorganic mortar system for a chemical fastening of an anchor in a mineral surface includes calcium sulfate, a component A, and a component B for initiating a curing process. Component A includes water, aluminous cement, at least one plasticizer, and at least one blocking agent selected from phosphoric acid, metaphosphoric acid, phosphorous acid, and a phosphonic acid. Component B includes an initiator, at least one retarder, at least one mineral filler, and water. Component A is also a curable composition.

First claim

The invention claimed is:

1. An inorganic mortar system for a chemical fastening of an anchor in a mineral surface, the inorganic mortar system comprising:
calcium sulfate,
a curable aluminous cement component A, and
an initiator component B for initiating a curing process,
wherein component A comprises water, a calcium aluminate cement, at least one plasticizer, and at least one blocking agent selected from the group consisting of phosphoric acid, metaphosphoric acid, phosphorous acid, and a phosphonic acid,
component B comprises an initiator comprising LiOH, at least one retarder, at least one mineral filler, and water,
component A and component B are separate,
a ratio of calcium aluminate cement comprising calcium sulfate to lithium hydroxide ((CAC+CaSO 4 )/LiOH) in the product obtained by mixing components A and B is in the range of from 1.3:1 to 12.5:1,
the calcium sulfate in the product obtained by mixing components A and B is present in the range of from about 0.95 wt.-% to 18.0 wt.-% and
a mortar prepared from said inorganic mortar system has a chemical shrinkage of from −0.61 to −1.61.

2. The inorganic mortar system according to claim 1 , wherein
component A comprising an aqueous-phase calcium aluminate cement.

3. The inorganic mortar system according to claim 1 , wherein
the calcium sulfate is in the form of calcium sulfate anhydrite, calcium sulfate hemihydrate or calcium sulfate dihydrate.

4. The inorganic mortar system according to claim 1 , wherein
the calcium sulfate is present in component A.

5. The inorganic mortar system according to claim 4 , wherein
the calcium sulfate is present in component A in a ratio of calcium sulfate to calcium aluminate cement in a range of from 5/95 to 30/70.

6. The inorganic mortar system according to claim 1 , wherein
the initiator comprises a mixture of at least two of an alkali metal salt, an alkaline earth metal salt, and a combination thereof,
the at least one retarder is selected from the group consisting of citric acid, tartaric acid, lactic acid, salicylic acid, gluconic acid, and a mixture thereof, and
the at least one mineral filler is selected from the group consisting of a limestone filler, sand, corundum, dolomite, alkaline-resistant glass, crushed stone, gravel, pebble, and a mixture thereof.

7. The inorganic mortar system according to claim 1 , wherein
the initiator comprises a mixture of at least two lithium metal salts.

8. The inorganic mortar system according to claim 1 , wherein
the ratio of water to calcium aluminate cement comprising calcium sulfate (W/(CAC+CaSO 4 )) in the product obtained by mixing components A and B is lower than 1.0.

9. The inorganic mortar system according to claim 1 , wherein
the anchor is an anchor rod, a threaded anchor rod, a bolt, or a steel reinforcement bar.

10. The inorganic mortar system according to claim 1 , wherein
the mineral surface is a structure comprising brickwork, concrete, pervious concrete, or natural stone.

11. The inorganic mortar system according to claim 1 , wherein
the mineral surface is a wet borehole.

12. The inorganic mortar system according to claim 1 , wherein
the mineral surface is a diamond drilled borehole.

13. A method of chemical fastening of an anchor in a mineral surface, the method comprising:
setting the anchor in a borehole present in the mineral surface in the presence of the inorganic mortar system according to claim 1 ; and
curing the inorganic mortar system, thereby increasing a load value of the borehole filled with a cured inorganic mortar system compared to a load value of a borehole without the cured inorganic mortar system.

14. A method of chemical fastening of an anchor in a mineral surface, the method comprising:
setting the anchor in a borehole present in the mineral surface in the presence of the inorganic mortar system according to claim 1 ; and
curing the inorganic mortar system, thereby increasing a load value of the borehole filled with a cured inorganic mortar system, thereby decreasing shrinkage of a cured inorganic mortar system in the borehole compared to a load value of a borehole without the cured inorganic mortar system.

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

Assignees

• Hilti Ag

Inventors

• Pfeil Armin
• Sirch Vanessa
• Garbatscheck Dominik

Classifications

• C04B2111/28

  Fire resistance, i.e. materials resistant to accidental fires or high temperatures · CPC title

• C04B40/065 Primary

  Two or more component mortars · CPC title

• C04B40/0658

  Retarder inhibited mortars activated by the addition of accelerators or retarder-neutralising agents · CPC title

• C04B40/0666

  Chemical plugs based on hydraulic hardening materials · CPC title

• C04B40/0625

  Wet ready-made mixtures, e.g. mortars in water- or airtight packages, or mortars containing an accelerator in a breakable emulsion · CPC title