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Extremely fast setting of cementitious compositions for producing cement-based products such as cement boards is made possible by adding an alkanolamine to a hydraulic cement such as portland cement, and forming a slurry with water under conditions that provide an initial slurry temperature of at le

Extremely fast setting of cementitious compositions for producing cement-based products such as cement boards is made possible by adding an alkanolamine to a hydraulic cement such as portland cement, and forming a slurry with water under conditions that provide an initial slurry temperature of at least 90° F. Use of alkanolamine under conditions disclosed herein allows an extremely rapid setting of the cementitious composition. Additional reactive materials may be included such as high alumina cement, calcium sulfate and a pozzolanic material such as fly ash. The extremely fast rapid set permits rapid production of cementitious products.

대표청구항 ▼

1. A method of providing a fast setting slurry comprising mixing an accelerating amount of an alkanolamine with hydraulic cement and water under conditions which provide an initial slurry temperature of at least 90° F. or 32.2° C. said slurry rapidly reaching peak temperature and achieving rapid set

1. A method of providing a fast setting slurry comprising mixing an accelerating amount of an alkanolamine with hydraulic cement and water under conditions which provide an initial slurry temperature of at least 90° F. or 32.2° C. said slurry rapidly reaching peak temperature and achieving rapid setting compared to slurries having a lower initial temperature.2. A method of claim 1 wherein said slurry has an initial temperature of at least 95° F. or 35° C.3. A method of claim 1 wherein said slurry has an initial temperature of at least 100° F. or 37.8° C.4. A method of claim 1 wherein said slurry has an initial temperature of at least 105° F. or 40.6° C.5. A method of claim 1 wherein said slurry has an initial temperature of at least 110° F. or 43.3° C.6. A method of claim 1 wherein said slurry has an initial temperature of about 110°-120° F. or 43.3-48.9° C.7. A method of claim 1 wherein said slurry has an initial temperature of at least 125° F. or 51.6° C.8. A method of claim 1 wherein said slurry has an initial temperature of about 130° F. or 54.4° C.9. A method of claim 1 wherein said slurry has an initial temperature of 90 to 130° F. or 32.2°-54.4° C.10. A method of claim 1 wherein said alkanolamine is selected from the group consisting of triethanolamine, diethanolamine, monoethanolamine and mixtures thereof.11. A method of claim 1 wherein said alkanolamine is triethanol amine and said accelerating amount of triethanolamine is about 0.03 to 4.0 wt % based on the weight of hydraulic cement.12. A method of claim 1 wherein said hydraulic cement is portland cement.13. A method of claim 12 wherein said slurry further comprises a mineral additive.14. A method of claim 13 wherein said mineral additive is fly ash.15. A method of claim 14 wherein said fly ash is Class C fly ash.16. A method of claim 13 wherein said mineral additive is ground granulated blast furnace slag.17. A method of claim 13 wherein said slurry further comprises high alumina cement and calcium sulfate.18. A method of claim 13 wherein said slurry further comprises an aggregate.19. A method of claim 17 wherein said slurry further comprises an aggregate.20. A method of claim 1 wherein said slurry further comprises a set retarder.21. A method of claim 20 wherein said set retarder is sodium citrate.22. A method of claim 17 wherein said portland cement is about 40 to 80 wt %, said high alumina cement is greater than zero up to 20 wt %, said alcium sulfate is greater than zero up to 7 wt %, said fly ash is greater than zero up to 55 wt %, based on the sum of said portland cement, high alumina cement, calcium sulfate and fly ash.23. A method of claim 14 wherein said portland cement is about 40 to 80 wt % and said fly ash is 20 to 60 wt % based on the sum of said portland cement and fly ash.24. A method of claim 22 wherein said alkanolamine is triethanolamine and in an amount of about 0.05 to 2.0 wt % based on the sum of said portland cement, high alumina cement, calcium sulfate, and fly ash.25. A method of claim 23 wherein said alkanolamine is triethanolamine and in an amount of about 0.05 to 1.0 wt % based on the sum of portland cement and fly ash.26. A method of claim 1 wherein said, initial slurry temperature is achieved by heating one or more of the components of said slurry.27. A method of claim 1 wherein said slurry further comprises an inorganic set accelerator.28. A method of claim 27 wherein said set accelerator is sodium carbonate.29. A method of claim 1 wherein said slurry further comprises a superplasticizer.30. A composition for preparing a cement board comprising:(a) portland cement; (b) mineral additive; (c) aggregate; (d) as an accelerator for components (a) and (b) an alkanolamine; (e) sufficient water to prepare a slurry; said slurry being at a temperature of at least 90° F. or 32.2° C. when components (a)-(e) are mixed to form said composition, said slurry rapidly reaching peak temperature and achieving rapid setting compared to slurries having a lower initial temperature. 31. A composition of claim 30 wherein said alkanolamine is selected from the group consisting of triethanolamine, diethanolamine, monoethanolamine and mixtures thereof.32. A composition of claim 31 wherein said alkanolamine is triethanolamine and said accelerating amount of triethanolamine is about 0.03 to 4.0 wt % based on the weight of portland cement.33. A composition of claim 30 wherein said mineral additive is fly ash.34. A composition of claim 30 wherein said mineral additive is ground granulated blast furnace slag.35. A composition of claim 33 wherein said composition further comprises high alumina cement and calcium sulfate.36. A composition of claim 30 wherein said composition further comprises a set retarder.37. A composition of claim 36 wherein set retarder is sodium citrate.38. A composition of claim 35 wherein said portland cement is about 40 to 80 wt %, said high alumina cement is greater than zero up to 20 wt %, aid calcium sulfate is greater than zero up to 7 wt %, said fly ash is greater than zero up to 55 wt %, based on the sum of said portland cement, high alumina cement, calcium sulfate and fly ash.39. A composition of claim 33 wherein said portland cement is about 40 to 80 wt % and said fly ash is 20 to 60 wt % based on the sum of said portland cement and fly ash.40. A composition of claim 30 wherein said composition includes an inorganic set accelerator.41. A composition of claim 40 wherein said inorganic set accelerator is sodium carbonate.42. A composition of claim 30 wherein said composition further comprises a superplasticizer.