Hardening accelerator for mineral binders
A hardening accelerator for mineral binders including an amino alcohol A and/or of a salt of said amino alcohol A, for example, cementitious binders, is provided. The amino alcohol A has a structure according to formula (I) where a) R 1 and R 2 , independently of one another, each represent an alkanol group including 3-4 carbon atoms, b) R 3 is an organic group including 1-8 carbon atoms, and c) R 3 is different from R 1 and/or R 2 .
1. A composition, comprising:
a hardening accelerator including an amino alcohol A and/or a salt of the amino alcohol A, and
a mineral binder,
wherein the amino alcohol A has a structure according to formula I:
wherein
a) R 1 and R 2 , independently of one another, each represents an alkanol group comprising 3-4 carbon atoms, and
b) R 3 represents an alkyl group.
2. The composition according to claim 1 , wherein R 1 and/or R 2 stand(s) for an isopropanol group.
3. The composition according to claim 1 , wherein the amino alcohol A is an N-alkyl diisopropanolamine.
4. The composition according to claim 1 , wherein the amino alcohol A is N-methyl diisopropanolamine, N-ethyl diisopropanolamine or N-propyl diisopropanolamine.
5. The composition according to claim 1 , wherein the amino alcohol A is N-methyl diisopropanolamine.
6. The composition according to claim 1 , wherein the amino alcohol A and/or its salt is used in a quantity of 0.01-5 wt %, with respect to the weight of the mineral binder.
7. The composition according to claim 1 , wherein the amino alcohol A and/or its salt is used in combination with at least one additional hardening accelerating substance.
8. The composition according to claim 1 , wherein the mineral binder contains at least 5 wt % of a hydraulic binder.
9. The composition according to claim 1 , wherein the mineral binder contains 5-95 wt % of a latent hydraulic and/or pozzolanic binder.
10. The composition according to claim 1 , wherein the amino alcohol A and/or its salt is/are added to the mineral binder before and/or during a process of grinding the mineral binder.
11. The composition according to claim 1 , wherein the mineral binder is a cementitious binder.
12. The composition according to claim 1 , wherein R 3 represents an alkyl group comprising 1-6 carbon atoms.
13. The composition according to claim 1 , wherein R 3 represents an alkyl group comprising 1-3 carbon atoms.
14. The composition according to claim 1 , wherein the amino alcohol A and/or its salt is used in a quantity of 0.05-2 wt %, with respect to the weight of the mineral binder.
15. The composition according to claim 1 , wherein the mineral binder contains at least 35 wt % of a hydraulic binder.
16. The composition according to claim 8 , wherein the hydraulic binder is cement.
17. The composition according to claim 1 , wherein the mineral binder contains 5-65 wt % of a latent hydraulic and/or pozzolanic binder.
18. The composition according to claim 9 , wherein the latent hydraulic and/or pozzolanic binder is slag and/or fly ash.
19. A molded body, obtained from curing the composition according to claim 1 .
20. A method for producing the composition according to claim 1 , the method comprising mixing an amino alcohol A and/or a salt of the amino alcohol A with a mineral binder.