# US 8,147,610 B2 · Cementitious formulations and products

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- Number: US 8,147,610 B2
- Document ID: US8147610B2
- Status: Granted
- Kind: B2
- Application number: 12/244,753
- Filed: 2008-10-02
- Published: 2009-04-09
- Granted: 2012-04-03
- Earliest claimed: 2007-10-02
- Assignees: James Hardie Technology Limited
- Inventors: Xiangdong Feng; Meiling Gong; Chinmay Avinash Gowardhan; Chongjun Jiang; Michael John Julius; Amitabha Kumar; Shannon Marie Labernik; Xiangyuan Liu; Liyan Ma; Basil Taha Naji; Kalynne Hitzeman Paradis; David John Sharman
- Web page: https://patentgrep.com/patent/US8147610B2

## CPC

- C04B 28/02: containing hydraulic cements other than calcium sulfates
- 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

## Abstract

Cementitious formulations and their products with enhanced reactivity are provided. Formulations in certain embodiments may include at least one calcium source, a reactant and a filler in a hydrated environment, wherein the reactant, in one form, is crystalline silica that has been modified for reactivity. Enhancement of a reactant may include one or more modifications to its content, grind and/or the cement to silica ratio, as well as addition of one or more additives in the formulation, additives in the form of at least one alumina source, defoamer, catalyst and/or a clay.

## Claims

### Claim 1

A cured cementitious formulation comprising:
silicon dioxide, wherein the silicon dioxide comprises reacted silicon dioxide and unreacted residual silicon dioxide;
calcium oxide; and
a filler, wherein the calcium oxide to total silicon dioxide molar ratio is between about 0.80 and 1.80, wherein the calcium oxide to the unreacted residual silicon dioxide molar ratio is between about 1.0 and 8.0.

### Claim 2 (depends on 1)

The formulation of claim 1, wherein the silicon dioxide is a pozzolan provided at a wt. % less than 25% and is greater than 500 m2/kg Blaine.

### Claim 3 (depends on 1)

The formulation of claim 1, wherein the silicon dioxide comprises crystalline silica.

### Claim 4 (depends on 1)

The formulation of claim 1, wherein the unreacted residual silicon dioxide content is less than about 15% by weight.

### Claim 5 (depends on 1)

The formulation of claim 1, wherein the formulation under hydrothermal conditions forms advanced calcium silicate hydrate phases selected from the group consisting of tobermorite, katoite, hydrogarnet and combinations thereof.

### Claim 6 (depends on 1)

The formulation of claim 1, wherein the formulation further comprises a catalyst, said catalyst is provided as a compound that lowers the activation energy of the reactant and promotes interaction between reactant and calcium source.

### Claim 7 (depends on 1)

The formulation of claim 1, wherein the filler has a particle size of less than 50 microns and a density of between about 90 to 130 kg/m3.

### Claim 8 (depends on 1)

The formulation of claim 1, wherein the filler is generally non-reactive and does not undergo substantial dissolution.

### Claim 9 (depends on 1)

The formulation of claim 1, wherein the filler comprises the calcium source.

### Claim 10 (depends on 1)

The formulation of claim 1, wherein the formulation has an calcium oxide to residual silicon dioxide molar ratio near about 1.0.

### Claim 11 (depends on 1)

The formulation of claim 1, wherein the formulation further comprises one or more additives in an amount between about 5 and 50 wt. % based on total dry ingredients.

### Claim 12 (depends on 11)

The formulation of claim 11, wherein the one or more additives are in the form of one or more catalysts, defoaming agents, clay, alumina source, low density modifiers and fibrous materials.

### Claim 13 (depends on 1)

The formulation of claim 1, wherein the formulation has an unreacted residual silicon dioxide content of less than 5%.

### Claim 14 (depends on 1)

The formulation of claim 1, wherein the formulation is hydrothermally cured.