Ternesite used as an additive in Portland cement
AssigneeHeidelbergcement AG
InventorsFrank Bullerjahn, Dirk Schmitt, Mohsen Ben Haha, Barbara Batog, Linda Irbe
Life of this patent
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Abstract
The present invention relates to the production of ternesite clinkers containing 20 to 100% by weight C5S2$ and less than 15% by weight C4A3$, and to the use of ternesite as an additive to Portland cement or Portland composite cement, and to a binder containing 20 to 95% by weight Portland cement (clinker) and 80 to 5% by weight ternesite (clinker).
Claims28
A binder containing Portland cement in an amount ranging from 20 to 95% by weight and a ternesite cement in an amount ranging from 5 to 80% by weight, the contents adding up to 100%,
- wherein the ternesite cement contains 20 to 100% by weight of a clinker phase comprising C5S2$ and remaining clinker phases comprising (α;
- β) C2S, C4(AxF(1-x))3$, where x is from 0.1 to 1.0, C2(AyF(1-y)), where y is from 0.2 to 0.8, reactive aluminates, periclase (M), and secondary phases, which are present in the following contents:
- (α, β) C2S
- 0 to 80%
- by weight
- C4(AxF(1−x))3$
- 0 to <15%
- by weight
- C2(AyF(1−y))
- 0 to 30%
- by weight
- reactive aluminates
- 0 to 20%
- by weight
- periclase (M)
- 0 to 25%
- by weight
- secondary phases
- 0 to 30%
- by weight,
- wherein the contents of the clinker phases add up to 100%.
A method for producing a binder containing Portland cement, wherein the binder comprises a ternesite clinker, which contains 20 to 100% by weight of a clinker phase comprising C5S2$ and further clinker phases comprising (α;
- β) C2S, C4(AxF(1-x))3$, where x is from 0.1 to 1.0, C2(AyF(1-y)), where y is from 0.2 to 0.8, reactive aluminates, periclase (M), and secondary phases, which are present in the following contents:
- (α, β) C2S
- 0 to 80%
- by weight
- C4(AxF(1−x))3$
- 0 to <15%
- by weight
- C2(AyF(1−y))
- 0 to 30%
- by weight
- reactive aluminates
- 0 to 20%
- by weight
- periclase (M)
- 0 to 25%
- by weight
- secondary phases
- 0 to 30%
- by weight,
- wherein contents of the clinker phases add up to 100%,
- the method comprising sintering a raw meal mixture, which contains at least sources for CaO, SiO2, and SO3,
- wherein a temperature during sintering is adjusted in the range of 900 to 1300° C. such that the ternesite clinker has a content of C5S2$ in the range from 20 to 100% by weight and a content of C4(AxF(1-x))3$ of less than 15% by weight, in each case relative to the total weight of the clinker, or a cement produced therefrom, in an amount ranging from 5 to 80% by weight and at least one Portland cement clinker, or a cement produced therefrom, in an amount ranging from 20 to 95% by weight are mixed with each other, wherein the content of C5S2$ in the binder amounts to at least 5% by weight and a content of C4(AxF(1-x))3$ in the binder amounts to a maximum of 5% by weight.
Dependencies are inferred from the claim text.