초록 ▼

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

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.

대표청구항 ▼

1. An apparatus for making a cementitious composition comprising: a first flow line configured to receive a first stream of Type I portland cement;a diverter disposed along said first flow line;a second flow line downstream from said diverter;said diverter configured to remove a scalped portion from

1. An apparatus for making a cementitious composition comprising: a first flow line configured to receive a first stream of Type I portland cement;a diverter disposed along said first flow line;a second flow line downstream from said diverter;said diverter configured to remove a scalped portion from said first stream of Type I portland cement and direct the scalped portion along said second flow line;said diverter configured to direct a remainder portion of said first stream of Type I portland cement to a downstream portion of said first flow line;said second flow line configured to route said scalped portion from said diverter to a classifier;said classifier adapted for receiving said scalped portion and separating said scalped portion into a primary portion and a secondary portion;a first storage silo connected to said downstream portion of said first flow line;a third flow line connected to said classifier and configured to route said secondary portion to said first storage silo;said first storage silo adapted for receiving said secondary portion and said remainder portion of said first stream of Type I portland cement;a second storage silo adapted for receiving said primary portion; anda fourth flow line connected to said classifier and configured to route said primary portion to said second storage silo;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. 2. The apparatus for making a cementitious composition of claim 1wherein said secondary portion and said remainder portion each meet specifications of Type I portland cement. 3. An apparatus for making a cementitious composition comprising: a first flow line configured to receive a first stream of portland cement;a diverter disposed along said first flow line;a second flow line downstream from said diverter;said diverter configured to remove a scalped portion from said first stream of portland cement and direct the scalped portion along said second flow line;said diverter configured to direct a remainder portion of said first stream of portland cement to a downstream portion of said first flow line;said second flow line configured to route said scalped portion from said diverter to a classifier;said classifier adapted for receiving said scalped portion and separating said scalped portion into a primary portion and a secondary portion;a first storage silo connected to said downstream portion of said first flow line;a third flow line connected to said classifier and configured to route said secondary portion of said first storage silo;the first storage silo adapted for receiving said secondary portion and said remainder portion of said first stream of portland cement;a second storage silo adapted for receiving said primary portion; anda fourth flow line connected to said classifier and configured to route said primary portion to said second storage silo;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. 4. The apparatus for making a cementitious composition of claim 3wherein said scalped portion comprises greater than about 10% by volume and less than about 30% by volume of the first stream of portland cement; andwherein said secondary portion and said remainder portion exhibit physical characteristics indicative of the same type of standardized portland cement. 5. 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 disposed along a first flow line and positioned to receive said first stream of Type I portland cement;a diverter partition positioned along said first flow line adjacent an outlet of the cooler;the diverter partition configured to receive the first stream of Type I portland cement and to divert a first portion of said first stream of Type I portland cement;a second classifier adapted for receiving said 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 positioned along said first flow line downstream of said diverter partition and adapted for receiving said secondary portion and a remainder portion of said first stream of Type I portland cement; anda 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.