Two-component mortar system based on aluminous cement and use thereof

1. A two-component mortar system, comprising:

a component A; and

a component B, which is in aqueous-phase for initiating a curing process,

wherein component A comprises water, aluminous 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 and

wherein component B comprises an initiator, at least one retarder, at least one mineral filler, and water, and wherein

i) the initiator comprises a mixture of at least two members selected from the group consisting of an alkali metal salt, an alkaline earth metal salt, and a combination thereof,

ii) 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,

iii) 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,

iv) component A is a curable composition, and

component A and component B are separate,

wherein

the two-component mortar system has an initial set time of at least 10 min.

2. The two-component mortar system according to claim 1 , wherein

the initiator comprises a mixture of at least two lithium metal salts.

3. The two-component mortar system according to claim 1 , wherein

at least one retarder is citric acid, tartaric acid, or a mixture thereof.

4. The two-component mortar system according to claim 1 , wherein

the at least one mineral filler has an average particle size of not more than 500 μm.

5. The two-component mortar system according to claim 1 , wherein

the at least one mineral filler is a limestone filler or a mixture of at least two limestone fillers.

6. The two-component mortar system according to claim 1 , wherein

the water to aluminous cement ratio (W/CAC) or water to calcium sulfoaluminate cement (W/CAS), in the product obtained by mixing components A and B, is lower than 1.5.

7. The two-component mortar system according to claim 1 , wherein

the shelf life of component A and component B is at least six months.

8. The two-component mortar system according to claim 1 , wherein

component A and component B are in form of a slurry or paste.

9. The two-component mortar system according to claim 1 , wherein

the pH-value of component B is above 10.

10. A two-component mortar system, comprising:

a component A; and

a component B, which is in aqueous-phase for initiating a curing process,

wherein component A comprises water, aluminous 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 and

wherein component B comprises an initiator, at least one retarder, at least one mineral filler, and water, and wherein

i) the initiator comprises a mixture of at least two members selected from the group consisting of an alkali metal salt, an alkaline earth metal salt, and a combination thereof,

ii) 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,

iii) 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,

iv) component A is a curable composition, and

component A and component B are separate,

wherein

component B comprises

0.1 wt.-% to 4 wt.-% of lithium hydroxide,

0.1 wt.-% to 5 wt.-% of lithium sulfate or lithium sulfate monohydrate,

0.05 wt.-% to 5 wt.-% of citric acid,

0.05 wt.-% to 4 wt.-% of tartaric acid,

35 wt.-% to 45 wt.-% of a first mineral filler,

15 wt.-% to 25 wt.-% of a second mineral filler,

10 wt.-% to 20 wt.-% of a third mineral filler,

0.01 wt.-% to 0.5 wt.-% of a thickening agent, and

15 wt.-% to 25 wt.-% of water based on a total weight of component B.

11. The two-component mortar system according to claim 10 , wherein

the first mineral filler, the second mineral filler, and the third mineral filler are three different calcium carbonate fines.

12. 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 two-component mortar system according to claim 1 ; and

curing the two-component mortar system.

13. The method according to claim 12 , 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.

14. The method according to claim 12 , wherein

the mineral surface is at least one member selected from the group consisting of brickwork, concrete, pervious concrete, and natural stone.