Compositions and methods for controling setting of carbonatable calcium silicate cements containing hydrating materials
AssigneeSolidia Technologies, Inc.
InventorsSean Quinn, Sadananda Sahu
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Abstract
The invention provides compositions and methods for controlling setting of carbonatable calcium silicate compositions that are contaminated with hydrating materials. These carbonatable calcium silicate cements are suitable for use as non-hydraulic cement that hardens by a carbonation process and may be applied in a variety of concrete components in the infrastructure, construction, pavement and landscaping industries.
Claims22
A calcium silicate composition comprising one or more discrete calcium silicate phases and one or more set-retarding or hydration-controlling compounds or admixtures, wherein the one or more discrete calcium silicate phases are selected from CS (wollastonite or pseudowollastonite), C3S2 (rankinite), C2S (belite, larnite, bredigite), and an amorphous calcium silicate phase, and wherein the calcium silicate composition is suitable for carbonation with CO2 at a temperature of about 30° C. to about 90° C. to form CaCO3 with a mass gain of about 10% or more.
A method for suppressing premature setting of a carbonateable calcium silicate composition comprising one or more hydraulic contaminants, comprising adding one or more set-retarding or hydration-controlling compounds or admixtures to a carbonateable calcium silicate composition or a precursor composition thereof.
A method for accelerating the drying rate or the curing rate of a carbonatable calcium silicate cement comprising one or more hydraulic contaminants, comprising adding one or more set-retarding or hydration-controlling compounds or admixtures to a carbonateable calcium silicate composition or a precursor composition thereof.
Dependencies are inferred from the claim text.