Compositions and methods for controling setting of carbonatable calcium silicate cements containing hydrating materials

Patent metadata

Field	Value
Publication number	US-2016096773-A1
Application number	US-201514874350-A
Country	US
Kind code	A1
Filing date	Oct 2, 2015
Priority date	Oct 3, 2014
Publication date	Apr 7, 2016
Grant date	—

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.

First claim

1 . 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 CO 2 at a temperature of about 30° C. to about 90° C. to form CaCO 3 with a mass gain of about 10% or more.

2 . The calcium silicate composition of claim 1 , wherein elemental Ca and elemental Si are present in the composition at a molar ratio from about 0.8 to about 1.2;
and metal oxides of Al, Fe and Mg are present in the composition at about 30% or less by mass.

3 . The calcium silicate composition of claim 1 , wherein the set-retarding or hydration-controlling compounds or admixtures comprise one or more of organic compounds.

4 . The calcium silicate composition of claim 3 , wherein the one or more of organic compounds are selected from lignosulfonates, hydroxycarboxylic acid and salts thereof, phosphonates, and sugars.

5 . The calcium silicate composition of claim 1 , wherein the set-retarding or hydration-controlling compounds or admixtures comprise one or more of inorganic compounds.

6 . The calcium silicate composition of claim 5 , wherein the one or more of inorganic compounds are selected from borates and phosphates.

7 . The calcium silicate composition of claim 1 , wherein the set-retarding or hydration-controlling compounds or admixtures comprise one or more of organic compounds and one or more of inorganic compounds.

8 . The calcium silicate composition of claim 1 , wherein the set-retarding compound or admixture comprises a sugar-based compound.

9 . The calcium silicate composition of claim 1 , wherein the set-retarding compound or admixture comprises a gluconate-based compound.

10 . The calcium silicate composition of claim 1 , wherein the set-retarding compound or admixture comprises a sugar-based compound and a gluconate-based compound.

11 . 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.

12 . 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.

13 . The method of claim 11 , wherein the set-retarding or hydration-controlling compounds or admixtures comprise one or more of organic compounds.

14 . The method of claim 13 , wherein the one or more of organic compounds are selected from lignosulfonates, hydroxycarboxylic acid and salts thereof, phosphonates, and sugars.

15 . The method of claim 11 , wherein the set-retarding or hydration-controlling compounds or admixtures comprise one or more of inorganic compounds.

16 . The method of claim 15 , wherein the one or more of inorganic compounds are selected from borates and phosphates.

17 . The method of claim 11 , wherein the set-retarding or hydration-controlling compounds or admixtures comprise one or more of organic compounds and one or more of inorganic compounds.

18 . The method of claim 11 , wherein the set-retarding compound or admixture comprises a sugar-based compound.

19 . The method of claim 11 , wherein the set-retarding compound or admixture comprises a gluconate-based compound.

20 . The method of claim 11 , wherein the set-retarding compound or admixture comprises a sugar-based compound and a gluconate-based compound.

21 . The method of claim 11 , wherein the carbonateable calcium silicate composition comprising a hydrating phase of CaO.

22 . The method of claim 11 , wherein the carbonateable calcium silicate composition comprising a contamination from Ordinary Portland Cement.

Assignees

• Solidia Technologies Inc

Inventors

• Quinn Sean
• Sahu Sadananda

Classifications

• C04B28/188

  the Ca-silicates being present in the starting mixture · CPC title

• C04B28/10 Primary

  Lime cements or magnesium oxide cements · CPC title

• Y02P40/18

  Carbon capture and storage [CCS] · CPC title

• C04B28/24 Primary

  containing alkyl, ammonium or metal silicates; containing silica sols {(reaction mixtures resulting in mineral polymers C04B28/006; polymeric reaction products of alkali metal silicates with isocyanates C08G18/3895)} · CPC title

• C04B2111/00017

  Aspects relating to the protection of the environment · CPC title