Very high early strength cement
阅读：623发布：2022-06-28
专利汇可以提供Very high early strength cement专利检索，专利查询，专利分析的服务。并且Fast setting hydraulic cement having very high compressive strengths within a few hours of mixing with water, and generally from about 2,900 to over 5,000 p.s.i. within 24 hours, containing beta 2CaO.SiO2; 3CaO.3A12O3CaSO4; and chemically unbound CaSO4 obtained by firing at a temperature between about 1,200 and 1,600*C for about 1 to 5 hours a mixture of a source respectively of CaO, SiO2, Al2O3 and SO3 in proportions of about 1 to 3 moles of CaSO4 to about 0.5 to 2 plus 2n moles of CaCO3 per mole of Al2O3.nSiO2 and grinding the resultant clinker.，下面是Very high early strength cement专利的具体信息内容。
1. A FAST-SETTING HYDRAULIC CEMENT WHICH RAPIDLY DEVELOPES STRENGTH AND WHICH HAS A COMPRESSIVE STRENGTH OF AT LEAST ABOUT 2,900 POUNDS PER SQUARE INCH WITHIN 24 H0URS AFTER INITIATION OF HYDRATION, CONTAINING FROM ABOUT 20 PERCENT TO ABOUT 40 PERCENT BY WEIGHT OF C3A3CS AND FROM ABOUT 10 PERCENT TO ABOUT 35 PERCENT BY WEIGHT OF CHEMICALLY UNBOUND CASO4, AND THE REMAINDER BEING SUBSTANTIALLY BETA C2S.
2. The cement of claim 1 in which the compressive strength is at least 4,000 p.s.i. within 24 hours after initiation of hydration when tested by ASTM C-109 using a 0.49 water/cement ratio.
3. The cement composition of claim 1 including a small amount of free CaO.
4. The cement composition of claim 1, being essentially free from C3A and C3S detectable by X-ray diffraction.
5. The cement composition of claim 1 in which the relative ratio of C3A3CS to CS by X-ray diffraction pattern peaks is about 0.5-2.5 to 1 respectively.
6. The cement composition of claim 1 which has an X-ray diffraction pattern that shows spacings of about 4.92; 3.76; 3.50; 3.26; 2.92; 2.89; 2.86; 2.80; 2.76; 2.67; 2.66; 2.63; 2.47-2.45; 2.41; 2.35; 2.33; 2.31; 2.30; 2.20; 2.18; 2.06; 2.05; 2.04; 1.990-1.986; 1.872; and 1.745-1.742 A.
7. The cement composition of claim 1 which has a calculated composition based on wet chemical analysis of about 28% C3A3CS; about 50 percent beta C2S; about 14 percent chemically unbound CS; and minor proportions of free C, the amount of such CS exceeding the amount of such C and their total being about 14 to about 35 percent.
8. The cement composition of claim 7 and having an X-ray diffraction pattern that shows spacings of about 4.92; 3.76; 3.50; 3.26; 2.92; 2.89; 2.86; 2.80; 2.76; 2.67; 2.66; 2.63; 2.47-2.45; 2.41; 2.35; 2.33; 2.31; 2.30; 2.20; 2.18; 2.06; 2.05; 2.04; 1.990-1.986; 1.872; and 1.745-1.742 A.
9. A feed mixture for a fast-setting hydraulic cement which rapidly develops strength and which has a compressive strength of at least about 2,900 p.s.i. within 24 hours after initiation of hydration after being fired to a clinker at a temperature between about 1,200* and 1,600*C for about 1 to 5 hours residence time; comprising a mixture of sources respectively of CaO, SiO2, Al2O3 and SO3 in proportions of about 1 to 3 moles of CaSO4 and about (0.5 to 2) + 2n moles of CaO per mole of Al2O3.nSiO2 where n is about 1.5 to about 2.5.
10. The feed mixture of claim 9 in which the sources of CaO, SiO2, Al2O3 and SO3 comprise limestone, kaolin clay, and gypsum.
11. The feed mixture of claim 9 in which the proportions are about 1.75 moles of CaSO4 and about 5.75 moles of CaO per mole of Al2O3.nSiO2 where n is 2.
12. The feed mixture of claim 9 in which the sources are fired at a temperature of about 1,260*C and the proportions are about 1.6-2.1 moles of CaSO4 and about 5.65-5.95 moles of CaO per mole of Al2O3.nSiO2 where n is 2.
13. The feed mixture of claim 9 in which the sources are fired at a temperature of about 1,300*C; and the proportions are in the area enclosed by the equations: 0.7X - 2.29Y + 12.0762 0 0.72X + 0.39Y - 3.1728 0; and 1.42X - 1.9Y + 6.9816 0 wherein Y represents the moles of CaO per mole of Al2O3 and X represents the moles of CaSO4 per mole of Al2O3.nSiO2 where n is 2.
14. The feed mixture of claim 9 in which the sources are fired at a temperature of about 1,350*C; and the proportions are about 1.7-2.8 moles of CaSO4 and about 4.75 to 6.25 moles. of CaO per mole of Al2O3.nSiO2 where n is 2.
15. A process for preparing a fast-setting hydraulic cement which rapidly develops strength and which has a compressive strength of at least about 2,900 p.s.i. within 24 hours after initiation of hydration comprising: forming a mixture of sources respectively of CaO, SiO2, Al2O3 and SO3 in proportions of about 1-3 moles of CaSO4 and about (0.5 to 2) + 2n moles of CaO per mole of Al2O3.nSiO2 where n is about 1.5 to about 2.5; and firing the mixture at a temperature between about 1,200*C and about 1,600*C for a residence time of about 1 to about 5 hours.
16. The process of claim 15 in which the source materials are in proportions of about 1.75 moles of CaSO4 and about 5.75 moles of CaO per mole of Al2O3.nSiO2 where n is 2.
17. The process of claim 15 in which the firing is at about 1, 260*C and the proportions are about 1.6-2.1 moles of CaSO4 and about 5.65-5.95 moles of CaO per mole of Al2O3.nSiO2 where n is 2.
18. The process of claim 15 in which the firing is at about 1, 300*C and the proportions are about in the area enclosed by the equations: 0.7X - 2.29Y + 12.0762 0 0.72X + 0.39Y - 3.1728 0; and 1.42X - 1.9Y + 6.9816 0 wherein Y represents the moles of CaO per mole of Al2O3 and X represents the moles of CaSO4 per mole of Al2O3.nSiO2 where n is 2.
19. The process of claim 15 in which the firing is at about 1, 350*C and the proportions are about 1.7-2.8 moles of CaSO4 and about 4.75-6.25 moles of CaO per mole of Al2O3.nSiO2 where n is 2.
20. The process of claim 15 including the step of grinding the resultant clinker.
21. The process of claim 15 in which CaSO4 is used as source of CaO by decomposition including the steps of forming a mixture of about 7 moles of CaSO4 per mole of Al2O3; and firing the mixture in a reducing atmosphere.
22. The process of claim 21 in which coke is included in the mixture to provide a reducing atmosphere.
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