# US 11,027,980 B2 · Alumina-modified colloidal silica particles, cementitious products containing same, and methods of use thereof

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- Number: US 11,027,980 B2
- Document ID: US11027980B2
- Status: Granted
- Kind: B2
- Application number: 16/426,484
- Filed: 2019-05-30
- Published: 2020-12-03
- Granted: 2021-06-08
- Earliest claimed: 2019-05-30
- Assignees: Intelligent Concrete, LLC
- Applicants: Intelligent Concrete, LLC
- Inventors: Jonathan S. Belkowitz; WhitneyLe B. Belkowtiz
- Web page: https://patentgrep.com/patent/US11027980B2

## CPC

- C01B 33/146: After-treatment of sols ({preparation of hydrosols or aqueous dispersions from hydroorganosols, organosols or dispersions in an organic medium C01B33/141}; preparation of hydroorganosols, organosols or dispersions in an organic medium from hydrosols {or aqueous dispersions} C01B33/145)
- C04B 7/02: Portland cement
- C04B 14/041: {Aluminium silicates other than clay}
- C04B 14/062: {Microsilica, e.g. colloïdal silica (preparing microsilica slurries or suspensions C04B18/148)}
- C04B 14/303: {Alumina}
- C04B 28/04: Portland cements
- C04B 2111/00112: {Mixtures characterised by specific pH values}
- C04B 2111/2023: {Resistance against alkali-aggregate reaction}
- C04B 2201/52: High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC]
- Y02W 30/91: Use of waste materials as fillers for mortars or concrete
- C01B: NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; {METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C}
- C04B: LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE {(roofing granules E04D7/005)}; CERAMICS (devitrified glass-ceramics C03C10/00); REFRACTORIES; TREATMENT OF NATURAL STONE
- Y02W: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT

## Abstract

Alumina-modified colloidal silica nanoparticles mitigate Alkali Silica Reaction (ASR) in cementitious compositions. Additives containing the nanoparticles are used in methods of reducing ASR in concrete and to form cementitious compositions. Cementitious products, such as concrete, made by these methods are described herein.

## Claims

### Claim 1

A method of forming a cementitious composition comprising mixing water, cement and an additive comprising colloidal silica nanoparticles that are at least partially coated in alumina in an aqueous solution.

### Claim 2 (depends on 1)

The method of claim 1, wherein the colloidal silica nanoparticles have diameters of about 3 nm to about 100 nm.

### Claim 3 (depends on 2)

The method of claim 2, wherein the colloidal silica nanoparticles have diameters of about 3 nm to about 5 nm.

### Claim 4 (depends on 2)

The method of claim 2, wherein the colloidal silica nanoparticles have diameters of about 9 nm to about 12 nm.

### Claim 5 (depends on 2)

The method of claim 2, wherein the colloidal silica nanoparticles have diameters of about 15 nm to about 17 nm.

### Claim 6 (depends on 2)

The method of claim 2, wherein the colloidal silica nanoparticles have diameters of about 45 nm to about 47 nm.

### Claim 7 (depends on 1)

The method of claim 1, wherein the colloidal silica nanoparticles are present from about 2.5% to about 55% based on the total weight of the additive.

### Claim 8 (depends on 1)

The method of claim 1, wherein the colloidal silica nanoparticles comprise about 0.03% to about 12% of a weight of the cementitious composition.

### Claim 9 (depends on 2)

The method of claim 2, wherein a concentration of colloidal silica nanoparticles is proportional to the diameters of the colloidal silica nanoparticles.

### Claim 10 (depends on 1)

The method of claim 1, wherein the additive pH is between about 5.0 and about 11.5.

### Claim 11 (depends on 1)

The method of claim 1, wherein the cementitious composition is concrete.

### Claim 12 (depends on 11)

The method of claim 11, wherein the concrete is selected from the group consisting of: Standard, High Peformance, Ultra High Perfoamance, Recycled Concrete Aggregate, Roller Compacted Concrete, Self-Consolidating Concrete, Light Weight Concrete, Shotcrete, Gunnite, Grout, and Mortar.

### Claim 13 (depends on 1)

The method of claim 1, wherein the aqueous solution is water.

### Claim 14 (depends on 1)

The method of claim 1, wherein the cement is selected from the group consisting of: ASTM C 150 Type I, I/II, II, III, IV, or V; ASTM C 1157; ASTM C approved SCMs; and ASCMs.

### Claim 15 (depends on 1)

The method of claim 1, wherein the additive further comprises at least one dispersion agent.

### Claim 16 (depends on 15)

The method of claim 15, wherein the colloidal silica nanoparticles are present from about 2.5% to about 55% based on the total weight of the additive.

### Claim 17 (depends on 1)

A cementitious product made by the method of claim 1, wherein the cementitious product is susceptible to reduced Alkali Silica Reaction (ASR) relative to a reference mixture comprising the colloidal silica nanoparticles that are at least partially coated in alumina.

### Claim 18 (depends on 17)

The cementitious product of claim 17, wherein the cementitious product has a compressive strength in the range of about 2000 to 30000 psi at about 20 days to about 60 days subsequent to mixing.

### Claim 19 (depends on 18)

The cementitious product of claim 18, wherein the cementitious product has a compressive strength in the range of about 5000 to 7500 psi at about 20 days to about 60 days subsequent to mixing.

### Claim 20 (depends on 17)

The cementitious product of claim 17, wherein the cementitious product is concrete and has reduced permeability over time, increased compressive and flexural strength over time, and increased resistance to chemical attack from acidic solutions, deicing brines and ASR over time, relative to a reference mixture comprising the colloidal silica nanoparticles that are at least partially coated in alumina.

### Claim 21

A method of reducing ASR in concrete comprising mixing into the concrete an additive comprising colloidal silica nanoparticles that are at least partially coated in alumina in an aqueous solution.

### Claim 22 (depends on 21)

The method of claim 21, wherein the colloidal silica nanoparticles have diameters of about 3 nm to about 100 nm.

### Claim 23 (depends on 22)

The method of claim 22, wherein the colloidal silica nanoparticles have diameters of about 3 nm to about 5 nm.

### Claim 24 (depends on 22)

The method of claim 22, wherein the colloidal silica nanoparticles have diameters of about 9 nm to about 12 nm.

### Claim 25 (depends on 22)

The method of claim 22, wherein the colloidal silica nanoparticles have diameters of about 15 nm to about 17 nm.

### Claim 26 (depends on 22)

The method of claim 22, wherein the colloidal silica nanoparticles have diameters of about 45 nm to about 47 nm.

### Claim 27 (depends on 21)

The method of claim 21, wherein a concentration of the colloidal silica nanoparticles is proportional to the diameters of the colloidal silica nanoparticles.

### Claim 28 (depends on 21)

The method of claim 21, wherein the additive pH is between about 5.0 and about 11.5.