Hardening acceleration/hardening retardation composition for building materials

Patent metadata

Field	Value
Publication number	US-11008262-B2
Application number	US-201716318307-A
Country	US
Kind code	B2
Filing date	Jul 12, 2017
Priority date	Jul 18, 2016
Publication date	May 18, 2021
Grant date	May 18, 2021

Abstract

Provided herein is a composition for use as a hardening regulator, e.g. hardening accelerator or hardening retarder, for building materials, as well as methods for producing thereof. The composition is characterized by a biphasic nature in which solid calcium silicate nanoparticles are dispersed in an aqueous solution comprising inorganic water soluble iron, and possibly zinc, silicate and calcium, species. Additional components such as inorganic ions and silica nanoparticles can be present. Depending on the relative ratio of each component, the composition can be used either for retarding or for accelerating the hardening process of a building material such as cement or concretes. The so-obtained building material further shows an enhanced strength upon compressive forces applied thereon.

First claim

The invention claimed is:

1. A composition for use as hardening regulator in the manufacturing of building materials, the composition comprising a plurality of solid calcium silicate nanoparticles dispersed into an aqueous solution comprising a water-soluble iron compound, a water-soluble magnesium compound, and a water-soluble zinc compound,
wherein the composition further comprises iron and/or silica nanoparticles.

2. The composition of claim 1 , wherein the calcium silicate nanoparticles have a mean size between about 10 and 100 nm.

3. The composition of claim 1 , wherein the calcium to silicate ratio in the calcium silicate nanoparticles is between 1 and 10.

4. The composition of claim 1 , wherein the composition further comprises aluminium ions and/or magnesium ions and/or copper ions.

5. The composition of claim 1 , wherein the iron and/or silica nanoparticles have a size between 5 nm and 100 micrometer.

6. The composition of claim 1 , wherein the composition comprises less than 5% in weight of organic compounds.

7. The composition of claim 1 , the composition further comprising a water soluble calcium compound, the water soluble calcium compound is selected from the group consisting of calcium bromide, calcium carbonate, calcium nitrate, calcium formate, calcium bicarbonate, calcium borate, calcium sulphide, calcium tartrate, di-calcium silicate, tri-calcium silicate, calcium chlorate, calcium iodide, calcium aluminate, calcium phosphate, calcium propionate, calcium oxide, calcium phosphate tribasic, calcium phosphate dibasic dehydrate, calcium phosphate dibasic anhydrous, calcium glycerophosphate, calcium chloride, calcium stearate, calcium gluceptate, calcium gluconate, calcium acetate, or any combination thereof.

8. The composition of claim 1 , the composition further comprising a water soluble silicate compound, the water soluble silicate compound is selected from the group consisting of sodium silicate, calcium silicate, potassium silicate, water glass, di-calcium silicate, tri-calcium silicate, silic acid, sodium metasilicate, potassium metasilicate, or any combination thereof.

9. The composition of claim 1 , wherein the water soluble zinc compound is selected from the group consisting of zinc bromide, zinc carbonate, zinc nitrate, zinc formate, zinc bicarbonate, zinc borate, zinc sulphide, zinc tartrate, di-zinc silicate, tri-zinc silicate, zinc chlorate, zinc iodide, zinc aluminate, zinc phosphate, zinc propionate, zinc oxide, zinc phosphate tribasic, zinc phosphate dibasic dehydrate, zinc phosphate dibasic anhydrous, zinc glycerophosphate, zinc acetate, zinc chloride, zinc gluconate, zinc gluceptate, zinc stearate, or any combination thereof.

10. The composition of claim 1 , wherein the water soluble iron compound is selected from the group consisting of iron bromide, iron carbonate, iron nitrate, iron formate, iron bicarbonate, iron borate, iron sulphide, iron tartrate, di-iron silicate, tri-iron silicate, iron chlorate, iron iodide, iron aluminate, iron stearate, iron phosphate, iron propionate, iron oxide, iron phosphate tribasic, iron phosphate dibasic dehydrate, iron phosphate dibasic anhydrous, iron glycerophosphate, iron acetate, iron chloride, iron gluconate, iron gluceptate, iron stearate, or any combination thereof.

11. A method for producing a hardening regulator and/or strength enhancer, for use in the manufacturing of building materials, the method comprising the steps of:
providing an aqueous solution comprising a water-soluble calcium compound, a water-soluble silicate compound, a water-soluble iron compound, a water-soluble zinc compound, a water-soluble magnesium compound, and iron nanoparticles and/or silica nanoparticles; and
allowing dispersion and reaction of the aqueous solution in a continuous or semi-batch or plug flow or drop wise manner,
wherein the following ratios are provided between the water-soluble compounds,
a ratio of the water-soluble calcium compound to the water-soluble iron compound between 1.0 and 3,
a ratio of the water-soluble zinc compound to the water-soluble calcium compound between 0 and 0.8, and
a ratio of the water-soluble silicate compound to the water-soluble calcium compound between 1.95 and 3.

12. The method of claim 11 , wherein the water soluble calcium compound is selected from the group consisting of calcium bromide, calcium carbonate, calcium nitrate, calcium formate, calcium bicarbonate, calcium borate, calcium sulphide, calcium tartrate, di-calcium silicate, tri-calcium silicate, calcium chlorate, calcium iodide, calcium aluminate, calcium phosphate, calcium propionate, calcium oxide, calcium phosphate tribasic, calcium phosphate dibasic dehydrate, calcium phosphate dibasic anhydrous, calcium glycerophosphate, calcium chloride, calcium stearate, calcium gluceptate, calcium gluconate, calcium acetate, or any combination thereof.

13. The method of claim 11 , wherein the water soluble silicate compound is selected from the group consisting of sodium silicate, calcium silicate, potassium silicate, water glass, di-calcium silicate, tri-calcium silicate, silic acid, sodium metasilicate, potassium metasilicate, or any combination thereof.

14. The method of claim 11 , wherein the water soluble zinc compound is selected from the group consisting of zinc bromide, zinc carbonate, zinc nitrate, zinc formate, zinc bicarbonate, zinc borate, zinc sulphide, zinc tartrate, di-zinc silicate, tri-zinc silicate, zinc chlorate, zinc iodide, zinc aluminate, zinc phosphate, zinc propionate, zinc oxide, zinc phosphate tribasic, zinc phosphate dibasic dehydrate, zinc phosphate dibasic anhydrous, zinc glycerophosphate, zinc acetate, zinc chloride, zinc gluconate, zinc gluceptate, zinc stearate, or any combination thereof.

15. The method of claim 11 , wherein the water soluble iron compound is selected from the group consisting of iron bromide, iron carbonate, iron nitrate, iron formate, iron bicarbonate, iron borate, iron sulphide, iron tartrate, di-iron silicate, tri-iron silicate, iron chlorate, iron iodide, iron aluminate, iron stearate, iron phosphate, iron propionate, iron oxide, iron phosphate tribasic, iron phosphate dibasic dehydrate, iron phosphate dibasic anhydrous, iron glycerophosphate, iron acetate, iron chloride, iron gluconate, iron gluceptate, iron stearate, or any combination thereof.

16. The method of claim 11 , wherein the reaction is performed at a temperature between 15° C. and 80° C.

17. The method of claim 11 , wherein the reaction is performed at a pH between 7 and 14.

18. The method of claim 11 , wherein in the step of providing, the aqueous solution further comprises a water-soluble zinc compound.

19. The method of claim 11 , wherein the iron nanoparticles and/or silica nanoparticles are added to the aqueous solution after providing the aqueous solution having the water-soluble calcium compound, the water-soluble silicate compound, the water-soluble iron compound, and the water-soluble zinc compound.

20. A composition for use as hardening regulator in the manufacturing of building materials, the composition comprising a plurality of solid calcium silicate nanoparticles dispersed into an aqueous solution comprising a water-soluble iron compound and a water-soluble zinc compound, the composition being free of organic compounds.

21. A method for producing a hardening regulator and/or strength enhancer, for use in the manufacturing of building materials, the method comprising the steps of:
providing an aqueous solution comprising a water-so

Assignees

• Ecole Polytechnique Fed Lausanne Epfl

Inventors

• Kumar Abhishek
• Bowen Paul

Classifications

• Y02W30/91

  Use of waste materials as fillers for mortars or concrete · CPC title

• C04B2103/24

  Hardening retarders · CPC title

• C04B2103/14

  Hardening accelerators · CPC title

• C04B40/0039 Primary

  Premixtures of ingredients · CPC title

• C04B14/06

  Quartz; Sand · CPC title