Narrow PSD hydraulic cement, cement-SCM blends, and methods for making same
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
C04B-007/32
C04B-007/36
C04B-009/11
C04B-011/28
C04B-028/06
C04B-014/12
C04B-016/08
C04B-038/00
C04B-028/26
C04B-014/00
C04B-018/06
C04B-024/00
C04B-007/00
C04B-009/12
C04B-028/00
C04B-028/04
C04B-007/52
출원번호
US-0798756
(2013-03-13)
등록번호
US-8551245
(2013-10-08)
발명자
/ 주소
Guynn, John M.
Hansen, Andrew S.
출원인 / 주소
Roman Cement LLC
대리인 / 주소
Workman Nydegger
인용정보
피인용 횟수 :
5인용 특허 :
31
초록▼
Hydraulic cements, such as Portland cements and other cements that include substantial quantities of tricalcium silicate (C3S), dicalcium silicate (C2S), tricalcium aluminate (C3A), and/or tetracalcalcium alumino-ferrite (C4AF), are particle size optimized to have increased reactivity compared to ce
Hydraulic cements, such as Portland cements and other cements that include substantial quantities of tricalcium silicate (C3S), dicalcium silicate (C2S), tricalcium aluminate (C3A), and/or tetracalcalcium alumino-ferrite (C4AF), are particle size optimized to have increased reactivity compared to cements of similar chemistry and/or decreased water demand compared to cements of similar fineness. Increasing hydraulic cement reactivity increases early strength development and release of reactive calcium hydroxide, both of which enhance SCM replacement and 1-28 day strengths compared to blends of conventional Portland cement and one or more SCMs, such as coal ash, slag or natural pozzolan. Decreasing the water demand can improve strength by decreasing the water-to-cement ratio for a given workability. The narrow PSD cements are well suited for making blended cements, including binary, ternary and quaternary blends.
대표청구항▼
1. A cement-SCM composition, comprising: a cement fraction that provides hydraulic cement particles with a d90 in a range of 11 μm to 30 μm, a d10 equal to or greater than 2 μm, and a ratio d90/d10 of less than or equal to 14.5;a coarse SCM fraction that provides coarse SCM particles with an average
1. A cement-SCM composition, comprising: a cement fraction that provides hydraulic cement particles with a d90 in a range of 11 μm to 30 μm, a d10 equal to or greater than 2 μm, and a ratio d90/d10 of less than or equal to 14.5;a coarse SCM fraction that provides coarse SCM particles with an average particle size that is about 1.25 times to about 25 times greater than an average particle size of the hydraulic cement particles and so that greater than 50% of particles larger than 20 μm provided by the coarse SCM fraction and the cement fraction comprise the coarse SCM particles; andan ultrafine SCM fraction that provides ultrafine SCM particles with a particle size so that at least 50% of particles smaller than 3 μm provided by the ultrafine SCM fraction and the cement fraction comprise the ultrafine SCM particles. 2. A cement-SCM composition as in claim 1, wherein the cement fraction comprises one or more minerals that, when mixed with water, react to form a cementitious binder comprised of at least one of calcium silicate hydrates or calcium aluminum hydrates, wherein the d90 of the hydraulic cement particles is in a range of 11 μm to about 25 μm, and wherein the ratio d90/d10 of the hydraulic cement particles is less than or equal to 11.5. 3. A cement-SCM composition as in claim 1, wherein the cement fraction comprises Portland cement and/or hydraulic cement having a tricalcium silicate content of at least about 50% by weight. 4. A cement-SCM composition as in claim 1, wherein the d90 of the hydraulic cement particles is in a range of 12.5 μm to 30 μm, the d10 is equal to or greater than 3 μm, and the ratio d90/d10 is less than or equal to 10. 5. A cement-SCM composition as in claim 1, wherein the coarse and fine SCM fractions comprise one more types of supplementary cementitious material (SCM) selected from the group consisting of pozzolans, fly ash, slag, ground granulated blast-furnace slag, natural pozzolans, artificial pozzolans, limestone, ground limestone, ground quartz, ground filler materials, and pulverized fuel ash. 6. A method of manufacturing the cement-SCM composition of claim 1, comprising: initially comminuting cement clinker to form an initially ground cement material;separating the initially ground cement material into a coarse cement fraction and a first fine cement fraction;further comminuting the coarse cement fraction to form a second fine cement fraction;blending the first and second fine cement fractions together to form the cement fraction; andcombining the cement fraction with the coarse and ultrafine SCM fractions to form the cement-SCM composition. 7. A method as in claim 6, wherein at least one of initially comminuting or further comminuting is performed by a roll press, and wherein initially comminuting, separating, further comminuting, and blending are performed in a continuous grinding-classification circuit that continuously grinds, classifies, and regrinds. 8. A hardened cementitious composition formed according to a method comprising: obtaining or forming the cement-SCM composition of claim 1, wherein the cement-SCM composition is either a preblended composition formed prior to mixing the cement-SCM composition with water and aggregate or is formed in situ within a freshly mixed cementitious composition;forming a fresh cementitious mixture comprising mixture products of the cement-SCM composition, water, and aggregate;placing the fresh cementitious mixture into a desired configuration; andallowing the fresh cementitious mixture to harden and form the hardened cementitious composition. 9. A method of manufacturing a cementitious composition, comprising: obtaining or forming the cement-SCM composition as in claim 1, wherein the cement-SCM composition is either a preblended composition formed prior to mixing the cement-SCM composition with water and aggregate or is formed in situ within a freshly mixed cementitious composition; andforming a fresh cementitious mixture comprising mixture products of the cement-SCM composition, water, and aggregate. 10. A cement-SCM blend, comprising: a cement fraction comprised of hydraulic cement particles that, when mixed with water, react to form a cementitious binder comprised of at least one of calcium silicate hydrates or calcium aluminum hydrates, the hydraulic cement particles having a d90 greater than 10 μm, a d50 equal to or greater than 6.5 μm, a d10 equal to or greater than 3 μm, a ratio d90/d10 of less than or equal to 10, and a d50/d10 of less than or equal to 6.85;a first SCM fraction that provides coarse SCM particles with a particle size so that greater than 50% of particles larger than 20 μm in the cement-SCM blend comprise the coarse SCM particles; anda second SCM fraction that provides ultrafine SCM particles with a particle size so that at least 50% of particles smaller than 3 μm in the cement-SCM blend comprise the ultrafine SCM particles. 11. A method of manufacturing the cement-SCM blend of claim 10, comprising: separately forming or obtaining the cement fraction, the first SCM fraction, and the second SCM fraction; andblending together the cement fraction, the first SCM fraction, and the second SCM fraction to form the cement-SCM blend. 12. A method as in claim 11, wherein the cement-SCM blend is formed prior to preparing a fresh cementitious composition comprising the cement-SCM blend, water, and aggregate. 13. A method as in claim 11, wherein the cement-SCM blend is formed in situ while preparing a fresh cementitious composition comprising the cement-SCM blend, water, and aggregate. 14. A cement-SCM blend, comprising: a cement fraction comprised of hydraulic cement particles that, when mixed with water, react to form a cementitious binder comprised of at least one of calcium silicate hydrates or calcium aluminum hydrates, the hydraulic cement particles having a d10 greater than or equal to 1.75 μm, a d50 greater than or equal to 6.5 μm, a d90 greater than 10 μm, and a ratio d90/d10 of less than or equal to 20, wherein the hydraulic cement particles are formed by grinding and classifying a cement clinker to within a PSD defined by the d10, d50, d90 and ratio d90/d10;a first SCM fraction that provides coarse SCM particles having an average particle size that is about 1.25 times to about 25 times greater than an average particle size of the hydraulic cement particles so that greater than 50% of particles larger than 20 μm in the cement-SCM blend comprise the coarse SCM particles, wherein the first SCM fraction comprises at least one member selected from the group consisting of natural pozzolans, artificial pozzolans, pulverized fuel ash, fly ash, slag, ground granulated blast-furnace slag, inert filler materials, and mixtures thereof; anda second SCM fraction that provides ultrafine SCM particles having a particle size so that at least 50% of particles smaller than 3 μm in the cement-SCM blend comprise the ultrafine SCM particles. 15. A cement-SCM blend as in claim 14, wherein the cement fraction comprises Portland cement, wherein the ultrafine SCM particles comprises an inert filler material that provides nucleation sites that promote formation of hydration products during hydration of the cement-SCM blend and a reactive SCM that reacts with excess calcium liberated from the hydraulic cement fraction during hydration of the cement-SCM blend, and wherein the coarse SCM particles comprise at least one of a non-reactive SCM or a reactive SCM. 16. A cement-SCM composition, comprising: a cement fraction that provides hydraulic cement particles that, when mixed with water, react to form a cementitious binder comprised of at least one of calcium silicate hydrates or calcium aluminum hydrates, the hydraulic cement particles having PSD with a d90 in a range of 11 μm to 30 μm, a d10 equal to or greater than 1 μm, and a ratio d90/d10 of less than or equal to 20;a coarse SCM fraction that provides coarse SCM particles with an average particle size that is about 1.25 times to about 25 times greater than an average particle size of the hydraulic cement particles and so that greater than 50% of particles larger than 20 μm provided by the coarse SCM fraction and the cement fraction comprise the coarse SCM particles; andan ultrafine SCM fraction that provides ultrafine SCM particles with a particle size so that greater than 50% of particles smaller than 1 μm provided by the ultrafine SCM fraction and the cement fraction comprise the ultrafine SCM particles. 17. A cement-SCM composition as in claim 16, wherein the d90 of the hydraulic cement particles is in a range of 12.5 μm to about 30 μm, the d10 is greater than 1.75 μm, the ratio d90/d10 is less than or equal to 16, and the hydraulic cement particles have a d50 equal to or greater than 5.5 μm. 18. A method of manufacturing the cement-SCM composition of claim 16, comprising: separately forming or obtaining the cement fraction, the coarse SCM fraction, and the ultrafine SCM fraction; andblending together the cement fraction, the coarse SCM fraction, and the ultrafine SCM fraction. 19. A hardened cementitious composition formed by a method comprising: obtaining or forming the cement-SCM composition of claim 16, wherein the cement-SCM composition is either a preblended composition formed prior to mixing the cement-SCM composition with water and aggregate or is formed in situ within a freshly mixed cementitious composition;forming a fresh cementitious mixture comprising mixture products of the cement-SCM composition, water, and aggregate;placing the fresh cementitious mixture into a desired configuration; andallowing the fresh cementitious mixture to harden and form the hardened cementitious composition. 20. A method of manufacturing a cementitious composition, comprising: obtaining or forming the cement-SCM composition as in claim 16, wherein the cement-SCM composition is either a preblended composition formed prior to mixing the cement-SCM composition with water and aggregate or is formed in situ within a freshly mixed cementitious composition; andforming a fresh cementitious mixture comprising mixture products of the cement-SCM composition, water, and aggregate.
연구과제 타임라인
LOADING...
LOADING...
LOADING...
LOADING...
LOADING...
이 특허에 인용된 특허 (31)
Naji,Basil; O'Chee,Milton, Additive for dewaterable slurry and slurry incorporating same.
Meyer,Hans Wilhelm; Streit,Norbert; Eckert,Carsten, Cement clinker production comprising partial removal of a flow of rotary kiln exhaust gas containing harmful substances.
Hunold Peter,DEX ; Keller Gunter,DEX ; Carstens Frank,DEX ; Meyer Hans W.,DEX, Method and apparatus for reducing pollutant circulations in the manufacture of cement clinker from raw meal.
Kupper Detlev (Telgte DEX) Knobloch Osbert R. (Rheda-Wiedenbrck DEX) Kimmeyer Ludger (Beckum DEX) Brosowski Werner (Hamm DEX), Method and apparatus for the comminution of material for grinding.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.