Activation of ground granulated blast furnace slag

Patent metadata

Field	Value
Publication number	US-12215059-B2
Application number	US-201917281153-A
Country	US
Kind code	B2
Filing date	Oct 1, 2019
Priority date	Oct 2, 2018
Publication date	Feb 4, 2025
Grant date	Feb 4, 2025

Abstract

An improved mineral binder composition including: a mineral binder including at least 30 weight-% slag, based on the weight of the mineral binder, an activator for the hydration of the slag consisting of or comprising calcium hydroxide and a co-activator consisting of or including at least one salt selected from the group consisting of lithium carbonate, lithium sulfate and sodium carbonate.

First claim

The invention claimed is:

1. A mineral binder composition comprising:
a mineral binder comprising 36-65 weight-% of slag and 35-64 weight-% of Portland cement, based on the weight of the mineral binder,
an activator for the hydration of the slag comprising calcium hydroxide and
a co-activator comprising at least one salt selected from the group consisting of lithium carbonate, lithium sulfate and sodium carbonate,
wherein the activator is present in an amount in a range of 0.5-3.0 weight-% based on the weight of the mineral binder,
wherein the co-activator is present in an amount in a range of 0.16-0.8 weight-% based on the weight of the mineral binder, and
wherein a weight-ratio of activator to co-activator is 10:1 to 1.1:1.

2. The mineral binder composition according to claim 1 , wherein the slag has a specific surface of 4,400 to 6,000 cm 2 /g, measured by the Blaine method.

3. The mineral binder composition according to claim 1 , wherein the co-activator comprises lithium carbonate and/or sodium carbonate.

4. The mineral binder composition according to claim 1 , wherein the co-activator consists of lithium carbonate and/or sodium carbonate.

5. The mineral binder composition according to claim 1 , further comprising 0.1 to 5 weight-%, calcium sulfate, based on the weight of the mineral binder without calcium sulfate.

6. The mineral binder composition according to claim 1 , further comprising a superplasticizer.

7. The mineral binder composition according to claim 1 , wherein
the activator is calcium hydroxide
the co-activator is lithium carbonate and/or sodium carbonate and the mineral binder composition further comprises,
0 to 4 weight-% of at least one superplasticizer,
0 to 5 weight-% calcium sulfate,
0.006 to 0.5 weight-% of a viscosity-enhancing agent, and
0 to 3 weight-% further additives,
wherein all weight-% are based on the weight of the mineral binder.

8. A method for accelerating setting and/or hardening of the mineral binder of claim 1 , comprising adding a composition comprising, based on the weight of the composition,
5 to 95 weight-% calcium hydroxide,
5 to 60 weight-% lithium carbonate, lithium sulfate or sodium carbonate,
0 to 40 weight-% calcium sulfate,
0 to 35 weight-% superplasticizer,
0 to 20 weight-% viscosity-enhancing agent, and
0 to 20 weight-% further additives
to the mineral binder.

9. A hardened body obtained after hardening of the mineral binder composition according to claim 1 after mixing with water.

Assignees

• Sika Tech Ag

Inventors

• Dupouy Lissa
• Liard Maxime
• Hauguel Lolita
• Lootens Didier

Classifications

• C04B22/147

  Alkali-metal sulfates; Ammonium sulfate · CPC title

• C04B22/143

  Calcium-sulfate · CPC title

• C04B22/106

  Bicarbonates · CPC title

• C04B2103/32

  Superplasticisers · CPC title

• C04B2103/14

  Hardening accelerators · CPC title