Cement additives for rapid strength development
AssigneeCemVision AB
InventorsClaes Göran Kollberg, Paul Johan Sandberg
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Abstract
Systems and methods are provided for a forming a supersulfated cementitious material. In one embodiment, the supersulfated cementitious material may include a ladle slag and one or more sulfates obtained from various industrial sulfurization processes. The supersulfated cementitious material may further include one or more supplementary cementitious materials (SCMs). An amount of ground granulated blast furnace slag incorporated into the supersulfated cementitious material may be less than 82% while demonstrating rapid strength development.
Claims23
A supersulfated cementitious material, comprising:
- i) at least 1 wt % of a hydraulic activator comprising calcium (Ca) and aluminum (Al), wherein:
- the calcium content, expressed as CaO equivalent, is at least 20 wt %;
- and
- the aluminum content, expressed as Al2O3 equivalent, is at least 15 wt %;
- ii) one or more sulfates;
- iii) granulated blast furnace slag;
- iv) tartaric acid in the range of 0.005 wt % to 0.5 wt %;
- and
- v) calcium nitrate in the range of 1 wt % to 2 wt %.
A cement mortar comprising a supersulfated cementitious material and an aggregate, wherein the supersulfated cementitious material comprises:
- i) at least 5 wt % of a hydraulic activator comprising calcium (Ca) and aluminum (Al), wherein:
- the hydraulic activator comprises ladle slag;
- the calcium content, expressed as CaO equivalent, is at least 20 wt %;
- and
- the aluminum content, expressed as Al2O3 equivalent, is at least 15 wt %;
- ii) at least 10 wt % of calcium sulfate;
- iii) 82 wt % or less of granulated blast furnace slag, said granulated blast furnace slag having a Blaine fineness of at least 400 m2/kg;
- iv) 3 wt % or less of Portland cement clinker;
- v) tartaric acid in the range of 0.005 wt % to 0.5 wt %;
- and
- vi) calcium nitrate in the range of 0.5 wt % to 3 wt %,
- wherein at least 5 wt % of the supersulfated cementitious material is comprised of the ladle slag.
A cement mortar comprising a supersulfated cementitious material and an aggregate, wherein the supersulfated cementitious material comprises:
- i) at least 1 wt % of a hydraulic activator comprising calcium (Ca) and aluminum (Al), wherein:
- the calcium content, expressed as CaO equivalent, is at least 20 wt %;
- and
- the aluminum content, expressed as Al2O3 equivalent, is at least 15 wt %;
- ii) at least 10 wt % of calcium sulfate;
- iii) 82 wt % or less of granulated blast furnace slag, said granulated blast furnace slag having a Blaine fineness of at least 400 m2/kg;
- iv) 3 wt % or less of Portland cement clinker;
- v) tartaric acid in the range of 0.005 wt % to 0.5 wt %;
- and
- vi) calcium nitrate in the range of 1 wt % to 2 wt %.
Dependencies are inferred from the claim text.