What are described are the use of a refractory coating composition for production of cores for diecasting, a kit for production of cores for use in diecasting, a method of producing cores for use in diecasting, cores for use in diecasting, and the use of such cores in diecasting, especially of lightweight metals

A two-component hybrid coating system which contains both an organic film forming polyacrylate polymer and particles capable of forming a geopolymer is provided. When the two reactive components are combined, a hybrid coating composition is provided containing a film forming organic polyacrylate polymer component and a geopolymer component.

A geopolymer composition for use as a cement or concrete is provided, the composition comprising: (a) fly ash (FA); (b) ground granulated blast-furnace slag (GGBS); and (c) high-magnesium nickel slag (HMNS). The composition may optionally comprise a filler. A method for forming a geopolymer composition is also provided, the method comprising: providing a geopolymer precursor comprising: (a) fly ash (FA); (b) ground granulated blast-furnace slag (GGBS); and (c) high-magnesium nickel slag (HMNS); combining components (a) to (c) with an activator, the activator comprising a silicate and a base in solution in a solvent; and allowing the resulting mixture to cure. The geopolymer composition advantageously comprises one or more allotropes of carbon, in particular a carbon nano-structure material, for example nanotubes, nanobuds and nanoribbons. The geopolymer composition finds use in form a wide range of construction components and structures.

A method comprising (a) contacting a suspension composition, water, and optionally one or more additives to form a wellbore servicing fluid at a location proximate a wellsite; wherein the suspension composition comprises a particulate material, an organic carrier fluid, and a suspension viscosifier; and (b) placing the wellbore servicing fluid in a wellbore penetrating a subterranean formation. The wellsite comprises an offshore platform, a floating vessel, or combinations thereof; and wherein the wellbore is offshore. A suspension composition comprising a particulate material, an organic carrier fluid, and a suspension viscosifier; wherein the particulate material is substantially insoluble in the organic carrier fluid; wherein the particulate material comprises a water-interactive material and/or a water-insoluble material; and wherein the organic carrier fluid comprises a glycol and/or a glycol ether.

The corrosion-preventing additive for reinforced concrete is a concrete additive for preventing corrosion of steel rebars in steel-reinforced concrete. The corrosion-preventing additive is a solution with an organic solvent, the solute being either gallic acid (3,4.5-trihydroxybenzoic acid), at least one ester of gallic acid, or combinations thereof. The weight-to-volume concentration of the solute to the organic solvent may be between 1% and 10% w/v. Reinforced concrete may be made using the corrosion-preventing additive by mixing the corrosion-preventing additive with a conventional concrete mixture (i.e., a mixture of an aggregate, water, and cement), with at least one steel rebar being embedded in the mixture, similar to conventional steel rebar reinforced concrete. The concentration of the corrosion-preventing additive with respect to the cement of the mixture may be between 0.0125 wt% and 1.0 wt%.

The corrosion-preventing additive for reinforced concrete is a concrete additive for preventing corrosion of steel rebars in steel-reinforced concrete. The corrosion-preventing additive is a solution with an organic solvent, the solute being either gallic acid (3,4.5-trihydroxybenzoic acid), at least one ester of gallic acid, or combinations thereof. The weight-to-volume concentration of the solute to the organic solvent may be between 1% and 10% w/v. Reinforced concrete may be made using the corrosion-preventing additive by mixing the corrosion-preventing additive with a conventional concrete mixture (i.e., a mixture of an aggregate, water, and cement), with at least one steel rebar being embedded in the mixture, similar to conventional steel rebar reinforced concrete. The concentration of the corrosion-preventing additive with respect to the cement of the mixture may be between 0.0125 wt% and 1.0 wt%.

The present invention relates to a geopolymer produced from a synthetic aluminosilicate. The synthetic aluminosilicate was produced by sol gel technology, heat treated and, later, activated using sodium silicate and sodium hydroxide in solution, having as a final product a synthetic geopolymer. The final product was submitted to CO.sub.2 adsorption analysis using thermogravimetry for adsorbed quantification. In addition to the pure geopolymer, it is also possible to produce the synthetic geopolymer with the addition of surfactant, or in the composite form with the addition of zeolite, or heat treated to form a zeolite or functionalized with amine, for example, to increase the adsorption capacity.

The present invention provides a wet press process and admixture components for making concrete slabs (flags) (16), curb (kerb) units, panels, boards, and other flat shapes, whereby colloidal silica and at least one alkanolamine and optional rheology control components are employed to provide an ideal combination of pressing time, green strength, surface definition, stack-ability, final concrete strength, and permeability. Stack-ability can be expressed in terms of minimum deflection or non-eccentricity of the units while standing on thickness edges at distances apart less than width or standing height. A wet press process typically involves introducing a highly fluid concrete mix into a mold (10,12), applying hydraulic pressure to consolidate the concrete (e.g., 1000-3000 PSI) and to extract excess water, removing the pressed concrete (16) while in a green state from the mold (10,12), and then standing the slab (16) units immediately upon removal from the mold (10,12) while in a green state, on an edge adjacent to but spaced apart from other edge-standing units. In further embodiments, rounded aggregates such as naturally occurring sand and/or gravel obtained from local sources can be incorporated into the concrete slabs without defeating (vertical) stack-ability in the green state.

Provided are an additive composition for a tile cement mortar and a tile cement mortar including the additive composition for a tile cement mortar. The provided additive composition for a tile cement mortar includes cellulose ether and urea, wherein the amount of the urea is from 5 parts by weight to 43 parts by weight based on 100 parts by weight of the cellulose ether.

A precursor cement slurry includes a cement powder, water, and an additive. The additive includes a cement bond enhancer and a non-aqueous fluid additive. The non-aqueous fluid additive is an internal phase and the cement bond enhancer stabilizes the non-aqueous fluid additive in the form of a Pickering emulsion within the precursor cement slurry. The cement bond enhancer is comprised of the reaction product of graphene oxide with an anchoring functionality. A method of forming the precursor cement slurry and a method of cementing an annular space within a wellbore are also provided.