Abstract: A geopolymer concrete prepared by predicting a mechanical property of a geopolymer concrete formed with each of a plurality of fly ash materials, selecting as a source material for the geopolymer concrete one of the fly ash materials that yields a predicted value of the mechanical property that is equal to or greater than a target value for the mechanical property, and mixing the fly ash source material with an alkaline activator solution, a fine aggregate, and a coarse aggregate. The prediction of the mechanical property includes measuring one or more properties of each of the plurality of fly ash materials, calculating predicted values of the mechanical property for geopolymer concretes formed with each of the plurality of fly ash materials using a predetermined equation relating the one or more properties of the plurality of fly ash materials to predicted values of the mechanical property of the geopolymer concrete.

Abstract: Well cementing compositions comprise water, an inorganic cement and flexible particles having an average density higher than 1.5 g/cm3. The flexible particles may be elastomers. The flexible particles and cement particles may be present in a trimodal particle size distribution. The compositions may be placed in subterranean wells in the context of primary or remedial cementing.

Abstract: A method is provided of thermally processing carbonaceous ash and ancillary carbonaceous material to produce a carbon-free inert, pozzolanic, or cementitious material and synthesis gas. The carbonaceous ash and ancillary fuels are fed into a thermal reactor along with oxides provided in the ash or in additives including limestone or glass. Carbon in the ancillary fuel and coal fly ash is converted to synthesis gas that is combusted to generate process steam and electricity. Remaining ash exits the thermal reactor chamber for processing at high temperature in a kiln gasifier to react the remaining fixed carbon and produce carbon-free partially-fused nodules or clinker that are cooled and ground to a desired fineness for cementitious or aggregate material in concrete. Carbonaceous ash, especially high carbon coal fly ash and other carbonaceous waste, are converted to energy and non-toxic, carbon-free aggregate or cementitious material used as architectural fill or in concrete mixes.

Abstract: The present disclosure relates to cement compositions comprising: (a) cement, (b) an electric arc furnace dust (EAFD), and (c) a non-chloride cement accelerator; wherein the electric arc furnace dust is present in an amount from greater than 0 wt % to 8 wt % based on the total weight of the cement (a). Also disclosed are methods for making the disclosed compositions and products using the disclosed compositions. This abstract is intended as a scanning tool for purposes of searching in the particular art and is not intended to be limiting of the present invention.

Abstract: The present invention provides methods of producing manufactured aggregates and other compositions from an encapsulated PCM slurry, suspension or emulsion by combining a cementitious binder and a adsorbent and/or absorbent with the PCM slurry. The encapsulated PCM-containing composition can be produced in an agglomeration process. The ingredients can also be mixed to form a viscous mass which can be extruded or otherwise formed to produce useful products.

Abstract: Conductive concrete mixtures are described that are configured to provide EMP shielding and reflect and/or absorb, for instance, EM waves propagating through the conductive concrete mixture. The conductive concrete mixtures include cement, aggregate, water, metallic conductive material, and conductive carbon particles and/or magnetic material. The conductive material may include steel fibers, and the magnetic material may include taconite aggregate. The conductive concrete mixture may also include graphite powder, silica fume, and/or other supplementary cementitious materials (SCM). The conductive carbon particles may comprise from about zero to twenty-five percent (0-25%) of the conductive concrete mixture by weight and/or the magnetic material may comprise from about zero to fifty percent (0-50%) of the conductive concrete mixture by weight.

Abstract: The invention provides a high density cement composition for preventing gas migration. The composition includes a silica sand component, a silica flour component, a hematite component, a manganese tetraoxide component, and an expansion additive component.

Abstract: A composition for hardening concrete that has a pH of less than 10, and may have a pH of 8 or less. Thus, the hardening composition may be free of or substantially free of alkaline materials. The hardening composition is water-based and includes silica particles and stabilizer, which may be present on portions of the surfaces of the silica particles. The stabilizer may be aluminum-based (e.g., it may comprise alumina, etc.). In use, the hardening composition is applied to the surface of concrete, either alone, with curing compounds, or as part of a polishing process. Any residue that remains on the treated surface may simply be swept, blown, or sprayed away.

Abstract: An anti-foam additive for a cement composition, including a fatty alcohol ester that is soluble in an aqueous medium at acidic pH, and hydrolysable in a basic medium, i.e. when the ester is incorporated into the cement composition, while releasing an active anti-foam molecule. This ester is preferably a fatty alcohol ester of a quaternary ammonium carboxylate, that is soluble in an aqueous solution of a superplasticizer, such as a polycarboxylate with poly(ethylene oxide) side chains. The additive can used for reducing the amount of air entrained during mixing or blending of mortars or concretes.

Abstract: A binder for construction materials containing a ground granulated blast furnace slag and at least one mono-, di- or trivalent metal salt chosen from bismuth, copper, silver or tin salts. The salt is capable of forming, during mixing with said slag, a metal sulfide for which the solubility product KSP, measured at 25° C., is less than 10?10.

Abstract: A heavy oil ash self-compacting concrete can include aggregate, heavy oil ash fines, water, and cement. The heavy oil ash can include more than 90% carbon, by weight. In an embodiment, the heavy oil ash self-compacting concrete can flow under its own weight and yet maintain a stable mixture consistency.

Abstract: The new cement composite has a matrix made of silicate cement, which is filled with natural crushed aggregate of arbitrary mineralogical composition and/or with artificial aggregate based on expanded clays. The composite further contains mixing water and plasticizers, while their amount is given by the required workability and the rate of the cement composite placement into formwork. The silicate cement has a dosage from 300 to 620 kg/m3 of composite and the aggregate is an aggregate with fraction 0-8 and dosage from 150 to 350 kg/m3 of composite. The composite further contains roughly crushed fragments of natural and/or synthetic textile and/or filling material such as foam plastic with the dosage from 80 to 150 kg/m3 of composite. These crushed fragments have arbitrary shape and their minimum dimension is in units of mm and the maximum dimension is up to tens of mm.

Abstract: We herewith propose the use of at least one nitrogen-containing organic compound and/or a salt thereof in combination with at least one aromatic carboxylic acid and/or a salt thereof for improving the freeze-thaw stability of an alkali-activated aluminosilicate binder, and a preferred alkali-activated aluminosilicate binder comprising ?-caprolactam and sodium benzoate as freeze-thaw stabilizers.

Abstract: Cement-SCM blends employ particle packing principles to increase particle packing density and reduce interstitial spacing between the cement and SCM particles. Particle packing reduces the amount of water required to obtain a cement paste having a desired flow, lowers the water-cementitious material ratio (w/cm), and increases early and long-term strengths. This may be accomplished by providing a hydraulic cement fraction having a narrow PSD and at least one SCM fraction having a mean particle size that differs from the mean particle size of the narrow PSD cement by a multiple of 3.0 or more to yield a cement-SCM blend having a particle packing density of at least 57.0%.

Abstract: The invention concerns the use of a carbohydrate-based compound as a mixing aid and dispersing agent in a pumpable geopolymeric suspension for oil and/or gas industry applications, said suspension further comprising an aluminosilicate source, a carrier fluid, and an activator, and method for placing such a suspension in a borehole. In particular, the suspension according to the invention is used for well primary cementing operations and/or remedial applications.

Abstract: A method for producing a reaction product including at least one synthetic formulation that carbonates sufficiently, said method comprising: providing a first raw material, having a first concentration of M; providing a second raw material, having a second concentration of Me; and mixing the first raw material and the second raw material to produce a reaction product that includes at least one synthetic formulation having the general formula MaMebOc, MaMeb(OH)d, MaMebOc(OH)d or MaMebO(OH)d•(H2O)e, wherein M comprises at least one metal that can react to form a carbonate and Me is at least one element that can form an oxide during the carbonation reaction, wherein the at least one synthetic formulation is capable of undergoing a carbonation reaction, and wherein the at least one synthetic formulation is capable of undergoing volume change during the carbonation reaction.

Abstract: A hybrid magnesium cement composition formed of an A-side and a B-side. The A-side having an A1-component including a light-burn grade magnesium-containing material, and an A2-component including a non-metallic oxide salt. A B-side having a metal silicate polymer is included.

Abstract: The claimed subject matter relates to a novel cement comprising Portland cement clinker and a supplementary cementitious material. The supplementary cementitious material comprises a heat treated clay material and an optionally heat treated carbonate material, wherein the clay material has been heat treated optionally together with the carbonate material in such a way that the heat treated clay material is substantially dehydroxylated while the optionally heat treated carbonate material remains substantially carbonated. This can be achieved by premixing the carbonate and clay materials before heat treating to 400-700 C, or heat treating the clay material separately to a temperature of up to 900 C. When used in the final application the cement results in much higher strengths than would be predict from any other combination of these materials.

Abstract: A shrinkage compensating concrete does not require restraint. The expansive forces developed during hydration compensate for concrete shrinkage, obviating the need for any added internal or external restraint element. Using this new shrinkage compensating concrete, substantially crack-free slabs may be built without using restraining steel bars, fibers, or other separate restraining element. The shrinkage compensating concrete includes a cement that develops internal expansive forces that never exceed the tensile strength of the concrete, such that the internal expansion compensates for the concrete shrinkage. The expansive cement may be an ASTMS, M or S cement, or other expansive cements may also be used.

Abstract: The present invention relates to a hydraulically setting mixture comprising: a) 6% to 25% by weight of cement, b) 50% to 90% by weight of at least one aggregate, and c) 0.01% to 8% by weight of at least one fluoroorganyl-substituted silicon compound, and also to materials produced from this mixture, more particularly components, concrete articles or mouldings. The invention further relates to the use of a hydraulically setting mixture of the invention for producing materials, more particularly components, concrete articles or mouldings, for example as facing concrete, where the surface of the materials exhibits only relatively low soiling tendency (“easy-to-clean” property) even on abrasion.