Extended-life cement compositions are provided and, more particularly, extended-life cement compositions are provided that comprise a cementitious component comprising red mud solids and hydraulic cement. A method of cementing may comprise providing an extended-life cement composition comprising a cementitious component, water, and a cement set retarder, wherein the cementitious component comprises red mud solids and a hydraulic cement; activating the extended-life cement composition; introducing the extended-life cement composition into a subterranean formation; and allowing the extended-life cement composition to set in the subterranean formation.

Cementitious compositions comprising lime, which may be foamed or non-foamed compositions, may increase carbon dioxide uptake of the cementitious compositions. Said cementitious compositions may be used in various cementing methods including pre-casting methods, cast-in-place methods, and primary or secondary cementing operations in a wellbore. The carbon dioxide may be added to the cementitious compositions during mixing, during pre-conditioning, during curing, or any combination thereof. Further, the carbon dioxide may be delivered as a gas (e.g., a gas that includes 1 vol % to 100 vol % carbon dioxide) or as a gas-entrained admixture that includes the gas, water, and a foaming agent.

Cementitious compositions comprising lime, which may be foamed or non-foamed compositions, may increase carbon dioxide uptake of the cementitious compositions. Said cementitious compositions may be used in various cementing methods including pre-casting methods, cast-in-place methods, and primary or secondary cementing operations in a wellbore. The carbon dioxide may be added to the cementitious compositions during mixing, during pre-conditioning, during curing, or any combination thereof. Further, the carbon dioxide may be delivered as a gas (e.g., a gas that includes 1 vol % to 100 vol % carbon dioxide) or as a gas-entrained admixture that includes the gas, water, and a foaming agent.

A non-sintered high-strength lightweight aggregate one-shot prepared from sulfur-based and alkaline-based solid wastes by stirring, granulation, and foaming, and a preparation method therefor and use thereof. The non-sintered high-strength lightweight aggregate is prepared from a sulfur-based solid waste, an alkaline-based solid waste, an auxiliary cementing material, a ferro-aluminum-sulfur cementing material, water, and a foaming agent as raw materials. Based on the mass of the total solid, the total content of the sulfur-based solid waste, the alkaline-based solid waste, and the auxiliary cementing material is 80-90 wt %, and the content of the ferro-aluminum-sulfur cementing material is 10-20 wt %. The mass ratio of the water to the total solid is (15-20):(80-85). The foaming agent accounts for 0.3-0.7% of the mass of the total solid. The mass ratio between the sulfur-based solid waste, the alkaline-based solid waste, and the auxiliary cementing material is (27-33):(27-33):(18-25).

Methods and systems for storing and mineralizing carbon dioxide in soil are disclosed herein. In some embodiments, the method comprises adding lime and carbon dioxide to a soil column including soil to form treated soil. After adding the lime and carbon dioxide, the method also includes strengthening the treated soil in the soil column by mineralizing the lime and carbon dioxide in the soil column. The method can further include adding a binder to the soil column and mixing the binder with the soil, lime, and carbon dioxide. The binder can include, for example, pozzolan, cement, cementitious material, and/or a manufactured calcium carbonate product.

Methods and systems for storing and mineralizing carbon dioxide in soil are disclosed herein. In some embodiments, the method comprises adding lime and carbon dioxide to a soil column including soil to form treated soil. After adding the lime and carbon dioxide, the method also includes strengthening the treated soil in the soil column by mineralizing the lime and carbon dioxide in the soil column. The method can further include adding a binder to the soil column and mixing the binder with the soil, lime, and carbon dioxide. The binder can include, for example, pozzolan, cement, cementitious material, and/or a manufactured calcium carbonate product.

The invention relates to a method for binding of carbon dioxide, comprising: providing a starting material which comprises sources for CaO and SiO.sub.2 and optionally also Al, Fe and/or Mg, hydrothermally treating the starting material in an autoclave at 50 to 300 C., tempering at 350 to 600 C., and hardening the resulting material with carbon dioxide. The invention further relates to building elements which are obtained by hardening a material according to the method.

The invention relates to a method for binding of carbon dioxide, comprising: providing a starting material which comprises sources for CaO and SiO.sub.2 and optionally also Al, Fe and/or Mg, hydrothermally treating the starting material in an autoclave at 50 to 300 C., tempering at 350 to 600 C., and hardening the resulting material with carbon dioxide. The invention further relates to building elements which are obtained by hardening a material according to the method.

Geopolymeric compositions are presented that are useful for cementing subterranean wells. The compositions may contain an aluminosilicate source, a metal silicate, an alkali activator and a slurry density modifier that may contain uintaite, vitrified shale, petroleum coke or coal or combinations thereof. Methods for placing the geopolymeric compositions in subterranean wells are also presented.

Geopolymeric compositions are presented that are useful for cementing subterranean wells. The compositions may contain an aluminosilicate source, a metal silicate, an alkali activator and a slurry density modifier that may contain uintaite, vitrified shale, petroleum coke or coal or combinations thereof. Methods for placing the geopolymeric compositions in subterranean wells are also presented.