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US 11,352,297 B2Granted
Carbonatable calcium silicate-based cements and concretes having mineral additives, and methods thereof
AssigneeSolidia Technologies, Inc.
InventorsAhmet Cuneyt Tas, Deepak Ravikumar, Jason E. Bryant
Life of this patent
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Abstract
The invention provides novel methods and novel additive compositions and use thereof in a wide range of concrete production for improving properties of concrete materials, such as durability and aestheticity. The methods and compositions of the invention may be applied in a variety of cement and concrete components in the infrastructure, construction, pavement and landscaping industries.
Claims9
A carbonatable composition, comprising:
- calcium silicate, wherein the calcium silicate comprises one or more of CS (wollastonite or pseudowollastonite), C3S2 (rankinite), or C2S (belite, larnite, bredigite) discrete calcium silicate phases, wherein the calcium silicate further comprises an amorphous calcium silicate phase at about 10% or more by mass of the total phases;
- one or more melilite type phases having the general formula (Ca,Na,K)2[(Mg, Fe2+,Fe3+,Al,Si)3O7] or ferrite type phases having the general formula Ca2(Al,Fe3+)2O5;
- and
- one or more minerals, wherein the one or more minerals are selected from the group consisting of submicron magnesium oxide powder, magnesium nitrate, magnesium sulfate, magnesium chloride, magnesium acetate, and combinations thereof,
- elemental Ca and elemental Si are present in the composition at a molar ratio from about 0.5 to about 1.5;
- and metal oxides of Al, Fe and Mg are present in the composition at about 30% or less by mass, and
- the composition is suitable for carbonation with CO2 at a temperature of about 10° C. to about 90° C. to form CaCO3 with a mass gain of about 10% or more.
4 more elements
Dependencies are inferred from the claim text.