Hardening acceleration/hardening retardation composition for building materials

Patent metadata

Field	Value
Publication number	US-2019284102-A1
Application number	US-201716318307-A
Country	US
Kind code	A1
Filing date	Jul 12, 2017
Priority date	Jul 18, 2016
Publication date	Sep 19, 2019
Grant date	—

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

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

2 . The composition of claim 1 , wherein the calcium silicate nanoparticles have a mean size comprised between about 10 and 100 nm, preferably between about 30 and 40 nm.

3 . The composition of claim 1 , wherein the calcium to silicate ratio in the calcium silicate nanoparticles is comprised between 1 and 10, preferably between 1 and 5, more preferably between 1.6 and 2.25.

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

5 . The composition of claim 1 , wherein it further comprises iron and/or silica nanoparticles.

6 . The composition of claim 5 , wherein said iron and/or silica nanoparticles have a size comprised between 5 nm and 100 micrometer, preferably between 5 nm and 10 micrometer, more preferably between 5 nm and 1 micrometer.

7 . The composition of claim 1 , wherein it comprises less than 5% in weight of organic compounds, preferably no organic compounds at all.

8 . The composition of claim 1 , wherein the water soluble calcium compound is selected from a list comprising 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, preferably calcium chloride, calcium stearate, calcium gluceptate, calcium gluconate or calcium acetate, or any combination of the foregoing.

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

10 . The composition of claim 1 , wherein the water soluble zinc compound is selected from a list comprising 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, preferably zinc acetate, zinc chloride, zinc gluconate, zinc gluceptate or zinc stearate, or any combination of the foregoing.

11 . The composition of claim 1 , wherein the water soluble iron compound is selected from a list comprising 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, preferably iron acetate, iron chloride, iron gluconate, iron gluceptate or iron stearate, or any combination of the foregoing.

12 . A method for producing a hardening regulator, possibly used also as a strength enhancer, for use in the manufacturing of building materials, wherein it comprises the following step:
a) providing an aqueous solution comprising a water-soluble calcium compound, a water-soluble silicate compound, a water-soluble iron compound and optionally a water-soluble zinc compound, in the presence or in the absence of iron and/or silica nanoparticles; b) if not present, optionally adding to the solution of a) iron and/or silica nanoparticles; and c) allowing the dispersion and the reaction of the components in a) optionally with the components in b) in a continuous or semi-batch or plug flow or drop wise manner.

13 . The method of claim 12 , wherein the water soluble calcium compound is selected from a list comprising 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, preferably calcium chloride, calcium stearate, calcium gluceptate, calcium gluconate or calcium acetate, or any combination of the foregoing.

14 . The method of claim 12 , wherein the water soluble silicate compound is selected from a list comprising sodium silicate, calcium silicate, potassium silicate, water glass, di-calcium silicate, tri-calcium silicate, silic acid, sodium metasilicate, potassium metasilicate or any combination thereof.

15 . The method of claim 12 , wherein the water soluble zinc compound is selected from a list comprising 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, preferably zinc acetate, zinc chloride, zinc gluconate, zinc gluceptate or zinc stearate, or any combination of the foregoing.

16 . The method of claim 12 , wherein the water soluble iron compound is selected from the list comprising 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, preferably iron acetate, iron chloride, iron gluconate, iron gluceptate or iron stearate, or any combination of the foregoing.

17 . The method of claim 12 , wherein the water soluble compounds are provided in the amounts according to Table 2.

18 . The method of claim 12 , wherein it is performed at a temperature comprised between 15° C. and 80° C., preferably between 15° C. and 60° C., more preferably between 15° C. and 40° C.

19 . The method of claim 12 , wherein it is performed at a pH comprised between 7 and 14, preferably between 8 and 14, more preferably between 9 and 14.

Assignees

• Ecole Polytechnique Fed Lausanne Epfl

Inventors

• Kumar Abhishek
• Bowen Paul

Classifications

• C04B14/043

  Alkaline-earth metal silicates, e.g. wollastonite · CPC title

• C04B2103/24

  Hardening retarders · CPC title

• C04B40/0039 Primary

  Premixtures of ingredients · CPC title

• C04B14/06

  Quartz; Sand · CPC title

• C04B2103/14

  Hardening accelerators · CPC title