High Albedo Concrete Composition

Abstract

Aspects of the invention include methods of removing carbon dioxide (CO 2 ) from a CO 2 containing gas. In some instances, the methods include contacting CO 2 containing gas with a bicarbonate buffered aqueous medium under conditions sufficient to produce a bicarbonate rich product. Where desired, the resultant bicarbonate rich product or a component thereof may then be stored or further processed, e.g., combined with a divalent alkaline earth metal cation, under conditions sufficient to produce a solid carbonate composition. Aspects of the invention further include systems for practicing the methods, as well as products produced by the methods.

1 - 54 . (canceled) 
     
     
         55 . A high albedo concrete composition, the concrete composition comprising:
 a highly reflective solid carbonate material that is produced by sequestering carbon dioxide (CO 2 ) from a CO 2  containing gas into CO 2 -sequestering aggregate.   
     
     
         56 . The high albedo concrete composition according to  claim 55 , wherein the material comprises a microcrystalline carbonate component. 
     
     
         57 . The high albedo concrete composition according to  claim 56 , wherein the microcrystalline carbonate component has a crystal size ranging from 0.1 microns to 100 microns. 
     
     
         58 . The high albedo concrete composition according to  claim 57 , wherein the microcrystalline carbonate component comprises a metal carbonate. 
     
     
         59 . The high albedo concrete composition according to  claim 55 , wherein the material comprises at least one of calcium carbonate and magnesium carbonate. 
     
     
         60 . The high albedo concrete composition according to  claim 55 , wherein the material is amorphous. 
     
     
         61 . The high albedo concrete composition according to  claim 55 , wherein the material is prepared by: contacting a CO 2  containing gas with an aqueous medium under conditions sufficient to produce a bicarbonate rich product; and precipitating a carbonate from the bicarbonate rich product. 
     
     
         62 . The high albedo concrete composition according to  claim 61 , wherein the bicarbonate rich product comprises droplets of a liquid condensed phase (LCP) in a bulk liquid. 
     
     
         63 . The high albedo concrete composition according to  claim 55 , wherein the material has a solar reflectance ranging from 25 to 99%. 
     
     
         64 . The high albedo concrete composition according to  claim 63 , wherein the material has a near infra-red (NIR) reflectance ranging from 25 to 99%. 
     
     
         65 . The high albedo concrete composition according to  claim 63 , wherein the material has an ultra-violet (UV) reflectance ranging from 25 to 99%. 
     
     
         66 . The high albedo concrete composition according to  claim 63 , wherein the material has a visible light reflectance ranging from 25 to 99%. 
     
     
         67 . The high albedo concrete composition according to  claim 55 , further comprising one or more pigments. 
     
     
         68 . The high albedo concrete composition according to  claim 55 , wherein the highly reflective material is applied to a surface of the composition.