Hydraulic binder comprising a ground blast furnace slag
AssigneeItalcementi S.p.A.
InventorsStefano Cangiano, Antonio Princigallo
Life of this patent
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Abstract
The present invention concerns a hydraulic binder comprising a ground blast furnace slag in an amount comprised between 30% and 95% by mass on the binder, Portland cement clinker in an amount equal to or greater than 5% by mass on the binder, and at least one sulphate as activator, characterised in that said slag has the following properties and composition by mass: grinding fineness greater than 4000 cm2/g Blaine glass content greater than 80% SiO2: 30-40% Al2O3: 9-13% CaO: 34-42% with a (CaO+MgO)/(Al2O3+SiO2) ratio greater than 1; and in that said sulphate is contained in a total amount, expressed as SO3, comprised between 0.6% and 4.5% by mass on the binder.
Claims16
Hydraulic binder comprising a ground blast furnace slag in an amount comprised between 30% and 95% by mass on the binder, Portland cement clinker in an amount equal to or greater than 5% by mass on the binder, and at least one sulphate as activator, characterized in that said slag has the following proprieties and composition by mass:
- grinding fineness greater than 4000 cm2/g Blaine;
- glass content greater than 80%
- SiO2:
- 30-40%
- Al2O2:
- 9-13%
- CaO:
- 34-42%
- with a (CaO+MgO)/(Al2O3+SiO2) ratio greater than 1;
- and in that said sulphate is contained in a total amount, expressed as SO3, comprised between 0.6% and 4.5% by mass on the binder.
A method for forming a hydraulic binder with a low content of Portland cement clinker and high compressive strength with quick curing, characterized in that a ground blast furnace slag having the following properties and composition by mass:
- grinding fineness greater than 4000 cm2/g Blaine
- glass content greater than 80%
- SiO2:
- 30-40%
- Al2O3:
- 9-13%
- CaO:
- 34-42%
- with a (CaO+MgO)/(Al2O3+SiO2) ratio greater than 1;
- is mixed in an amount comprised between 30% and 95% by mass on the binder with Portland cement clinker in an amount equal to or greater than 5% by mass on the binder, the binder comprising at least one sulphate as activator contained in a total amount, expressed as SO3, comprised between 0.6% and 4.5% by mass on the binder.
Dependencies are inferred from the claim text.