# US 2012/0074251 A1 · Cementitious composition and apparatus and method for manufacturing the same

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- Number: US 2012/0074251 A1
- Document ID: US20120074251A1
- Status: Published application
- Kind: A1
- Application number: 13/312,390
- Filed: 2011-12-06
- Published: 2012-03-29
- Earliest claimed: 2008-02-04
- Assignees: Capitol Aggregates, Ltd.
- Inventors: Louis U. Spellman; Jose Garcia
- Web page: https://patentgrep.com/patent/US20120074251A1

## CPC

- C04B 7/527: {obtaining cements characterised by fineness, e.g. by multi-modal particle size distribution}
- 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

A cementitious composition capable of forming high early strength cement when admixed with water may comprise, for each 100% by weight, no more than about 60% by weight C3S, at least about 4% by weight C2S, and between about 7% and about 11% by weight SO3, wherein the cementitious composition has a particle size distribution such that substantially all of its particles are of a size of about 10 microns or smaller. A cementitious composition may have a ratio of weight % SO3 to weight % Al2O3 of at least about 1.5 and a particle size distribution such that substantially all of its particles are of a size of about 10 microns or smaller. An apparatus and method for making such a cementitious composition are also described.

## Claims

### Claim at position 1

1-25. (canceled)

### Claim 26

An apparatus for making a cementitious composition comprising:
a classifier adapted for receiving a first stream of Type I portland cement and separating said first stream into a primary portion and a secondary portion; and
a first storage silo adapted for receiving said secondary portion and a remainder portion of said first stream of Type I portland cement;
a second storage silo adapted for receiving said primary portion;
wherein said primary portion has a particle size distribution such that substantially all of its particles are of a size of about 10 microns or smaller;
wherein said secondary portion and said remainder portion are combinable to form a resultant cementitious composition;
wherein said resultant cementitious composition is selected from Type I portland cement and Type III portland cement.

### Claim 27 (depends on 26)

The apparatus for making a cementitious composition of claim 26 wherein said primary portion has a mean particle size less than about 3 microns.

### Claim 28

An apparatus for making a cementitious composition comprising:
a classifier adapted for receiving a first stream of portland cement and separating said first stream into a primary portion and a secondary portion; and
a first storage silo adapted for receiving said secondary portion and a remainder portion of said first stream of portland cement;
a second storage silo adapted for receiving said primary portion;
wherein said primary portion has a particle size distribution such that substantially all of its particles are of a size of about 10 microns or smaller;
wherein said secondary portion and said remainder portion are combinable to form a resultant cementitious composition;
wherein said resultant cementitious composition is selected from Type I portland cement and Type III portland cement.

### Claim 29 (depends on 28)

The apparatus for making a cementitious composition of claim 28 wherein said primary portion has a mean particle size less than about 3 microns.

### Claim 30

An apparatus for making a cementitious composition comprising:
a first classifier adapted for receiving a first resultant cementitious composition from a grinding mill and separating said first resultant cementitious composition into a first stream of Type I portland cement and a recycled portion suitable for being fed back into the grinding mill;
a cooler positioned to receive said first stream of Type I portland cement;
a second classifier adapted for receiving a first portion of said first stream of Type I portland cement and separating said first portion of said first stream of Type I portland cement into a primary portion and a secondary portion;
a first storage silo adapted for receiving said secondary portion and a remainder portion of said first stream of Type I portland cement; and
a second storage silo adapted for receiving said primary portion;
wherein said primary portion has a particle size distribution such that substantially all of its particles are of a size of about 10 microns or smaller;
wherein said secondary portion and said remainder portion are combinable to form a resultant cementitious composition;
wherein said resultant cementitious composition is selected from Type I portland cement and Type III portland cement.