Cement compositions and methods of making the same from waste

Abstract

Disclosed herein is a method comprising: (a) calcining a feedstock material in a reactor; wherein the feedstock material comprises: (i) a metal-containing solid material and/or a metal oxide-containing solid material, and (ii) a reactive gas configured to react to form a solid carbon, wherein the reactive gas comprises a methane and optionally carbon dioxide and/or carbon monoxide; wherein calcining is performed at a temperature of 500° C. to 1450° C.; (b) forming a first amount of hydrogen and a supplementary cementitious material (SCM), wherein the supplementary cementitious material comprises a solid carbon dispersed within the metal-containing solid material and/or the metal oxide containing solid material. Additionally, disclosed are SCMs formed by the disclosed methods, concrete compositions comprising the disclosed SCMs, and articles comprising the disclosed concrete compositions. Also disclosed are methods of recycling the disclosed concrete compositions.

Dependencies are inferred from the claim text.