Cement compositions and methods for using the same in subterranean formations are provided. In one embodiment, the methods include introducing a treatment fluid including an aqueous base fluid, at least one viscoelastic surfactant, a divalent salt, a metal salt; and a metal oxide into a wellbore penetrating at least a portion of a subterranean formation; and allowing the treatment fluid to at least partially set in the subterranean formation.

Cement compositions and methods for using the same in subterranean formations are provided. In one embodiment, the methods include introducing a treatment fluid including an aqueous base fluid, at least one viscoelastic surfactant, a divalent salt, a metal salt; and a metal oxide into a wellbore penetrating at least a portion of a subterranean formation; and allowing the treatment fluid to at least partially set in the subterranean formation.

A synchronous single-liquid grouting slurry, its technology and application for large diameter shield engineering under water-rich, high-pressure and weak soil strata conditions, comprising raw materials: 1050-1200 parts of gold tailing, 420-480 parts of silicate cement clinker, 220-240 parts of fly ash, 45-120 parts of waste clay brick, 65-95 parts of slag, 25-45 parts of limestone tailing, 70-80 parts of steel slag, 30-45 parts of silica fume, 15-22 parts of desulfurized gypsum, and 9-15 parts of quick-setting and early-strength composite additive. The invention controls the d.sub.50, d.sub.85 and d.sub.95 of the material particles as 35-40, 42-48 and 50-55 μm, respectively. Gold tailing with the particle size of 120-600 μm being used as the fine aggregate, their volume fractions are 40-60%. The slurry production technique, comprising crushing-sieving-superfine ball milling-homogenization-particle size classification-variable speed mixing being developed. The shield tail eight-point grouting technique is being developed for filling.

The present invention relates to additives and, more specifically, the use of biochar, in concrete and other cementitious materials to provide for building materials that have a lower carbon footprint than their traditional counterparts. Traditional methods for production of cement produce large amount of carbon dioxide (CO2). When coupled with the massive demand for cement building materials around the world, this means that the cement production has a significant impact on the amount of CO2 produced globally. By including biochar and other additives along with, or instead of some traditional components of cement, one may be able to provide for cementitious building materials that sequester carbon, rather than release it.

The present invention relates to additives and, more specifically, the use of biochar, in concrete and other cementitious materials to provide for building materials that have a lower carbon footprint than their traditional counterparts. Traditional methods for production of cement produce large amount of carbon dioxide (CO2). When coupled with the massive demand for cement building materials around the world, this means that the cement production has a significant impact on the amount of CO2 produced globally. By including biochar and other additives along with, or instead of some traditional components of cement, one may be able to provide for cementitious building materials that sequester carbon, rather than release it.

A system and method, according to one or more exemplary embodiments, for a fireproof, soundproof, lightweight cement and wood composite wall system that is very inexpensive, outlasts wood frame homes, and replaces many building materials in one installation whereby the composite wall system may be formed from wood shavings, cement, calcium chloride, and water mixed at high speed for air entrainment.

A system and method, according to one or more exemplary embodiments, for a fireproof, soundproof, lightweight cement and wood composite wall system that is very inexpensive, outlasts wood frame homes, and replaces many building materials in one installation whereby the composite wall system may be formed from wood shavings, cement, calcium chloride, and water mixed at high speed for air entrainment.

The present invention provides an apparatus for manufacturing artificial marble, which includes a granite soil storage unit configured to supply a granite soil by storing, drying, and heating it, a granite soil heating unit configured to heat the granite soil supplied from the granite soil storage unit, a resin storage unit configured to store a thermoplastic polyurethane (TPU) resin maintained in a solid phase at room temperature, a mixing-transporting unit configured to accommodate the TPU resin and the heated granite soil therein and then melting and mixing them to produce and simultaneously transport an artificial marble slurry, a material guide unit configured to guide the granite soil and the TPU resin into the mixing-transporting unit, a discharge unit configured to discharge the artificial marble slurry mixed in the mixing-transporting unit by a certain amount, a mold supply unit configured to continuously supply a mold for accommodating and molding the artificial marble slurry therein, a mold guide unit configured to guide the mold supplied from the mold supply unit downward of the discharge unit to accommodate the artificial marble slurry in the mold, a forming unit configured to form an artificial marble by applying vibration and pressure to the artificial marble slurry accommodated in the mold, an extraction unit configured to extract the mold accommodating the artificial marble, and a lamination unit configured to laminate and store the mold extracted by the extraction unit.

The present invention is a ready-mixed, drying-type joint compound including an alkali sensitive component and a pH buffer system of a weak acid and its conjugate base to maintain pH of 8-12, typically for 120 days or more at 75° F. in a sealed container.

The present invention is a ready-mixed, drying-type joint compound including an alkali sensitive component and a pH buffer system of a weak acid and its conjugate base to maintain pH of 8-12, typically for 120 days or more at 75° F. in a sealed container.