Claims
- 1. A hardenable cementitious composition comprising cement and an amount of a sulfated polysaccharide effective to maintain desired fluidity of the cementitious composition, said sulfated polysaccharide comprising dextran sulfates, starch sulfates, natural gum sulfates or curdlan sulfates.
- 2. A hardenable cementitious composition comprising cement and an amount of a cement additive effective to maintain desired fluidity of the cementitious composition, said cement additive consisting essentially of a cellulose sulfate.
- 3. A hardenable cementitious composition according to claim 1 wherein the sulfated polysaccharide is a curdlan sulfate.
- 4. A hardenable cementitious composition according to claim 1 wherein the sulfated polysaccharide has an average molecular weight of from 5,000-200,000.
- 5. A hardenable cementitious composition according to claim 1 wherein the sulfated polysaccharide has an average molecular weight of from 90,000-165,000.
- 6. A hardenable cementitious composition according to claim 1 wherein the sulfated polysaccharide has an average molecular weight of from 100,000-150,000.
- 7. A hardenable cementitious composition according to claim 1 wherein the sulfated polysaccharide has a sulfur content of from 1-20% by weight.
- 8. A hardenable cementitious composition according to claim 1 wherein the sulfated polysaccharide has a sulfur content of from 5.5-20%.
- 9. A hardenable cementitious composition according to claim 1 wherein the sulfated polysaccharide has a sulfur content of from 12-20%.
- 10. A hardenable cementitious composition according to claim 2 wherein the cellulose sulfate is a cellulose ether sulfate.
- 11. A hardenable cementitious composition according to claim 2 wherein the cellulose sulfate has an average molecular weight of from 5,000-200,000.
- 12. A hardenable cementitious composition according to claim 2 wherein the cellulose sulfate has an average molecular weight of from 90,000-165,000.
- 13. A hardenable cementitious composition according to claim 2 wherein the cellulose sulfate has an average molecular weight of from 100,000-150,000.
- 14. A hardenable cementitious composition according to claim 2 wherein the cellulose sulfate has a sulfur content of from 1-20% by weight.
- 15. A hardenable cementitious composition according to claim 2 wherein the cellulose sulfate has a sulfur content of from 5.5-20%.
- 16. A hardenable cementitious composition according to claim 2 wherein the cellulose sulfate has a sulfur content of from 12-20%.
- 17. A process of modifying flow characteristics of a fluid cementitious mix, comprising adding to a cementitious mix an amount of a sulfated polysaccharide effective to maintain desired fluidity of the cementitious mix, said sulfated polysaccharide comprising dextran sulfates, starch sulfates, natural gum sulfates or curdlan sulfates.
- 18. A process according to claim 17 wherein the sulfated polysaccharide is a curdlan sulfate.
- 19. A process according to claim 13 wherein the sulfated polysaccharide has an average molecular weight of from 5,000-200,000.
- 20. A process according to claim 17 wherein the sulfated polysaccharide has an average molecular weight of from 90,000-165,000.
- 21. A process according to claim 17 wherein the sulfated polysaccharide has an average molecular weight of from 100,000-150,000.
- 22. A process according to claim 17 wherein the sulfated polysaccharide has a sulfur content of from 1-20% by weight.
- 23. A process according to claim 17 wherein the sulfated polysaccharide has a sulfur content of from 5.5-20%.
- 24. A process according to claim 17 wherein the sulfated polysaccharide has a sulfur content of from 12-20%.
- 25. A process of modifying flow characteristics of a fluid cementitious mix comprising adding to a cementitious mix an amount of a cement additive effective to maintain desired fluidity of the cementitious composition, said cement additive consisting essentially of a cellulose sulfate.
- 26. A process according to claim 25 wherein the cellulose sulfate is a cellulose ether sulfate.
- 27. A process according to claim 25 wherein the cellulose sulfate has an average molecular weight of from 5,000-200,000.
- 28. A process according to claim 25 wherein the cellulose sulfate has an average molecular weight of from 90,000-165,000.
- 29. A process according to claim 25 wherein the cellulose sulfate has an average molecular weight of from 100,000-150,000.
- 30. A process according to claim 25 wherein the cellulose sulfate has a sulfur content of from 1-20% by weight.
- 31. A process according to claim 25 wherein the cellulose sulfate has a sulfur content of from 5.5-20%.
- 32. A process according to claim 25 wherein the cellulose sulfate has a sulfur content of from 12-20%.
Priority Claims (2)
Number |
Date |
Country |
Kind |
5-87717 |
Mar 1993 |
JPX |
|
6-75239 |
Mar 1994 |
JPX |
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Parent Case Info
This is a continuation-in-part of U.S. Ser. No. 08/381,582 filed Jan. 30, 1995, now abandoned, which is in turn a continuation of U.S. Ser. No. 08/207,644 filed Mar. 8, 1994, now abandoned.
US Referenced Citations (12)
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Non-Patent Literature Citations (5)
Entry |
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Continuations (1)
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Number |
Date |
Country |
Parent |
207644 |
Mar 1994 |
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Continuation in Parts (1)
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Number |
Date |
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Parent |
381582 |
Jan 1995 |
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