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US 2018/0273430 A1Published application
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.
Claims22
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;
- and
- one or more minerals,
- wherein
- the one or more minerals are selected from the group consisting of magnesium, magnesium oxide, magnesium nitrate, magnesium sulfate, magnesium chloride, magnesium acetate, ground dolomite, ground limestone, suspension of magnesium hydroxide, 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.
5 more elements
A method for forming a concrete product, comprising:
- prior to curing cement to form a concrete product, adding to the concrete mixture an admixture comprising one or more minerals;
- and
- curing the cement to form a concrete product,
- wherein
- the cement is a carbonatable calcium silicate-based cement, and
- the one or more minerals are selected from the group consisting of magnesium, magnesium oxide, magnesium nitrate, magnesium sulfate, magnesium chloride, magnesium acetate, ground dolomite, ground limestone, suspension of magnesium hydroxide, and combinations thereof.
3 more elements
17-22. (canceled)
A composite material, comprising:
- a plurality of bonding elements, wherein each bonding element comprises:
- a core comprising primarily calcium silicate,
- a silica-rich inner layer, and
- a calcium carbonate-rich outer layer;
- and
- a plurality of filler particles,
- wherein
- the plurality of bonding elements and the plurality of filler particles together form one or more interlocking acicular polymorphs.
5 more elements
27-37. (canceled)
Dependencies are inferred from the claim text.