Portland cement and additives therefor
阅读：991发布：2023-05-11
专利汇可以提供Portland cement and additives therefor专利检索，专利查询，专利分析的服务。并且The rate of hardening of a portland cement mix is accelerated by the addition of a monomeric, water-soluble hydroxylated adduct formed by reacting a urea and an aldehyde, said adduct being employed in an amount within the range of from about 0.01 percent to about 1.00 percent, advantageously about 0.2 percent to about 0.8 percent, by weight of cement. The water content of the cement mix for a given consistency tends to be lowered by the incorporation of the adduct, conveniently monomethylolurea and dimethylolurea, while avoiding toxic and corrosive effects normally associated with aldehyde-type set accelerators. The adducts may be employed in concentrated amounts in water and may be used in combination with known set accelerating agents. The adducts may also be employed in combination with set retarders where reduction in water content is desired without appreciable change in the rate of set of the cement mix.，下面是Portland cement and additives therefor专利的具体信息内容。
2. The hydraulic cement mix of claim 1 in which the additive comprises monomethylolurea.
3. The hydraulic cement mix of claim 2 in which said additive is present in an amount within the range of from about 0.2 percent to about 0.8 percent by weight of cement.
4. The hydraulic cement mix of claim 1 in which said additive comprises dimethylolurea.
5. The hydraulic cement mix of claim 4 in which said additive is present in an amount within the range of from about 0.2 percent to about 0.8 percent by weight of cement.
6. The hydraulic cement mix of claim 1 and including therein a second additive comprising a concrete set retarding agent in an amount such that the effect of said combination of additives on the rate of hardening is less than that resulting from the use of the first additive alone, the water content of the mix for a given consistency being advantageously limited.
7. The hydraulic cement mix of claim 6 in which said set retarder comprises calcium lignosulfonate and said first additive is taken from the group consisting of monomethylolurea, dimethylolurea and mixtures thereof.
8. The hydraulic cement mix of claim 7 in which said first additive is present in an amount within the range of from about 0.2 percent to about 0.8 percent by weight of cement.
9. The hydraulic cement mix of claim 1 and including a second additive comprising an additional set accelerating agent in an amount such as to effect a further acceleration in the rate of hardening of said cement mix.
10. The hydraulic cement mix of claim 9 in which said second adDitive comprises water-soluble formates.
11. The hydraulic cement mix of claim 10 in which said water-soluble formates comprise sodium formate.
12. The hydraulic cement mix of claim 10 in which said first additive is taken from the group consisting of monomethylolurea, dimethylolurea, and mixtures thereof.
13. The hydraulic cement mix of claim 12 in which said first additive is present in an amount within the range of from about 0.2 percent to about 0.8 percent by weight of cement.
14. A process for accelerating the hardening of hydraulic cement mixes comprising incorporating an additive in a hydraulic cement mix of portland cement, aggregate, and sufficient water to effect hydraulic setting of the cement, said additive comprising a monomeric, water-soluble hydroxylated adduct formed by the reaction of an aldehyde and a urea, said additive being incorporated in an amount within the range of from about 0.01 percent to about 0.8 percent by weight of cement, whereby the rate of hardening of the cement mix is accelerated and the amount of water required for a given consistency is limited without undesired toxic or corrosive effects.
15. The process of claim 14 in which said additive is incorporated in said mix as a dry powder.
16. The process of claim 4 in which said additive is incorporated in said mix as a water mixture.
17. The process of claim 16 in which said additive is incorporated as a concentrated water mixture having an adduct concentration of at least about 50 percent by weight of said mixture.
18. The process of claim 14 in which the additive comprises monomethylolurea.
19. The process of claim 18 in which said additive is incorporated in an amount within the range of from about 0.2 percent to about 0.8 percent by weight of cement.
20. The process of claim 14 in which the additive comprises dimethylolurea.
21. The process of claim 20 in which said additive is incorporated in an amount within the range of from about 0.2 percent to about 0.8 percent by weight of cement.
22. The process of claim 14 and including the incorporating of a second additive in said cement mix, said second additive comprising a concrete set retarder in an amount such that the effect of said combination of additives on the rate of hardening is less than that resulting from the use of the first additive alone, the water content of the mix for a given consistency being advantageously limited.
23. The process of claim 22 in which said set retarder comprises calcium lignosulfonate and said first additive is taken from the group consisting of monomethylolurea, dimethylolurea and mixtures thereof.
24. The process of claim 23 in which said first additive is incorporated into the cement mix in an amount within the range of from about 0.2 percent to about 0.8 percent by weight of cement.
25. The process of claim 14 and including the incorporating of a second additive in said cement mix, said second additive comprising an additional set accelerating agent in an amount such as to effect a further acceleration in the rate of hardening of said cement mix.
26. The process of claim 25 in which said second additive comprises water-soluble formates.
27. The process of claim 26 in which said water-soluble formates comprise sodium formate.
28. The process of claim 26 in which said first additive is taken from the group consisting of monomethylolurea, dimethylolurea, and mixtures thereof.
29. The process of claim 28 in which said first additive is incorporated in an amount within the range of from about 0.2 percent to about 0.8 percent by weight of cement.
30. The process of claim 29 in which said first additive comprises di-methylolurea.
31. The process of claim 22 in which said first additive is incorporated in said mix in dry powder form.
32. The process of claim 22 in which said first additive is incorporated in said mix as a water mixture.
33. The process of claim 32 in whIch said first additive is incorporated as a concentrated water mixture having an adduct concentration of at least about 50 percent by weight of said mixture.
34. The process of claim 25 in which said first additive is incorporated in said mix in dry powder form.
35. The process of claim 25 in which said first additive is incorporated in said mix as a water mixture.
36. The process of claim 35 in which said first additive is incorporated as a concentrated water mixture having an adduct concentration of at least about 50 percent by weight of said mixture.
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