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

Patent metadata

Field	Value
Publication number	US-10815157-B2
Application number	US-201816493447-A
Country	US
Kind code	B2
Filing date	Apr 3, 2018
Priority date	Apr 7, 2017
Publication date	Oct 27, 2020
Grant date	Oct 27, 2020

Abstract

Calcium carbonate which has an average particle size in the range of from 0.5 to 3 μm is used in an inorganic mortar system for a chemical fastening of anchors and post-installed reinforcing bars in mineral substrates. The system includes a curable aluminous cement component A and an initiator component B for initiating the curing process. The component A includes at least one blocking agent selected from phosphoric acid, metaphosphoric acid, phosphorous acid and phosphonic acids, at least one plasticizer, and water. The component B includes an initiator, at least one retarder, at least one mineral filler, and water. Moreover, the calcium carbonate increases load values. Further, a method is used for a chemical fastening of anchors and post-installed reinforcing bars in mineral substrates, such as structures made of brickwork, concrete, pervious concrete or natural stone.

First claim

The invention claimed is:

1. An inorganic mortar system, comprising:
a curable aluminous cement component A,
an initiator component B for initiating curing process, and
calcium carbonate having an average particle size in the range of from 0.5 to 3 μm,
wherein the inorganic mortar system chemically is suitable for fastening anchors and post-installed reinforcing bars in mineral substrates
wherein
the curable aluminous cement component A comprises at least one blocking agent and at least one plasticizer, and
the initiator component B comprises an initiator, at least one retarder, at least one mineral filler and water.

2. The inorganic mortar system according to claim 1 , wherein the curable aluminous cement component A is an aluminous cement component based on an aqueous-phase calcium aluminate cement.

3. The inorganic mortar system according to claim 1 , wherein the at least one blocking agent is selected from the group consisting of phosphoric acid, metaphosphoric acid, phosphorous acid, and phosphonic acid.

4. The inorganic mortar system according to claim 1 , wherein the calcium carbonate has a residue in the range of from 0.01% to 0.3% on a 45 μm sieve, determined according to ISO 787/7.

5. The inorganic mortar system according to claim 1 , wherein the calcium carbonate is comprised in the initiator component B of the inorganic mortar system.

6. The inorganic mortar system according to claim 5 , wherein the calcium carbonate comprised in the initiator component B is present in the range of from about 3.0 wt.-% to 20.0 wt.-%, based on the total weight of the initiator component B.

7. The inorganic mortar system according to claim 1 , wherein the initiator component B comprises a mixture of alkali and/or alkaline earth metal salts, wherein the at least one retarder is selected from the group consisting of citric acid, tartaric acid, lactic acid, salicylic acid, gluconic acid and mixtures thereof, and wherein the at least one mineral filler is selected from the group consisting of limestone fillers, sand, corundum, dolomite, alkaline-resistant glass, crushed stones, gravels, pebbles, and mixtures thereof.

8. The inorganic mortar system according to claim 1 , wherein the initiator comprises a mixture of lithium salts.

9. The inorganic mortar system according to claim 1 , wherein the anchors and post-installed reinforcing bars are anchor rods, threaded anchor rods, bolts, or steel reinforcement bars.

10. The inorganic mortar system according to claim 1 , wherein the mineral substrates are structures made of brickwork, concrete, pervious concrete, or natural stone.

11. The inorganic mortar system according to claim 1 , wherein the inorganic mortar system is a multi-component inorganic mortar system.

12. The inorganic mortar system according to claim 1 , wherein the calcium carbonate has an average particle size in the range of from 1 to 3 μm.

13. The inorganic mortar system according to claim 1 , wherein the weight ratio between the curable aluminous cement component A and the initiator component B is from 7:1 to 1:3.

14. The inorganic mortar system according to claim 1 , wherein said system is a ready-for-use system, wherein the curable aluminous cement component A and the initiator component B are separately produced and introduced into separate containers, and wherein the curable aluminous cement component A and the initiator component B can be mixed by a mixing device.

15. A method for a chemical fastening of anchors and post-installed reinforcing bars in mineral substrates, the method comprising:
mixing and applying the inorganic mortar system according to claim 1 .

16. A method for a chemical fastening of anchors and post-installed reinforcing bars in mineral substrates, the method comprising:
mixing and applying an inorganic mortar system, which comprises a curable aluminous cement component A and an initiator component B for initiating curing process,
wherein the curable aluminous cement component A further comprises at least one blocking agent, at least one plasticizer and water,
wherein the initiator component B comprises an initiator, at least one retarder, at least one mineral filler and water, and
wherein the inorganic mortar system contains calcium carbonate having an average particle size in the range of from 0.5 to 3 μm.

Assignees

• Hilti Ag

Inventors

• Sharmak Anna
• Pfeil Armin
• Götz-Neunhöffer Friedlinde
• Jansen Daniel

Classifications

• E21D20/02

  with provisions for grouting · 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

• C04B28/06

  Aluminous cements (monolithic refractories or refractory mortars C04B35/66) · CPC title

• C04B14/28

  of calcium · CPC title

• C04B28/065

  Calcium aluminosulfate cements, e.g. cements hydrating into ettringite · CPC title