Transformation of lump slag into supplementary cementitious material by carbonatization
AssigneeHConnect 2 GmbH
InventorsMohsen BEN HAHA, Gerd BOLTE, Frank BULLERJAHN, Wolfgang DIENEMANN, Jan SKOCEK, Maciej ZAJAC
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Abstract
The present invention relates to a supplementary cementitious material, a method for producing the supplementary cementitious material, the use of the supplementary cementitious material, a binder comprising the supplementary cementitious material, a method for the preparation of the binder and use of the binder to make hydraulic building materials like concrete.
Claims22
1-15. (canceled)
A supplementary cementitious material comprising Si, Ca, Mg, Al, Fe, wherein an X-ray amorphous portion is at least 15% by weight based on a total weight of the supplementary cementitious material and wherein a sum of an amount of carbonated calcium and magnesium is at least 15% by weight based on the total weight of the supplementary cementitious material, obtained by carbonatization of a precursor material, wherein the precursor material is a lump slag, having a basicity B1
- B
- 1
- =
- m
-
- (
- CaO
- )
- m
-
- (
- SiO
- 2
- )
- in arrange from 0.60 to 1.25, and a weight ratio CaO/Fe2O3 from 20 to 350 determined from amounts of the oxides measured by X-ray fluorescence (XRF).
A method for producing a supplementary cementitious material comprising the steps of:
- i) providing a precursor material comprising Si, Ca, Mg, Al, Fe, having basicity B1 defined as weight ratio of CaO to SiO2 in a range from 0.60 to 1.25, having an X-ray amorphous portion of less than 66%, and having a particle size distribution with a D90 of ≤500 μm determined by laser granulometry, wherein the precursor material is a lump slag, and
- ii) carbonatization of the precursor material of step i) to provide the supplementary cementitious material.
Dependencies are inferred from the claim text.