Abstract: A method for enhancing compressive strength of a lead smelting water-quenched slag-based cementitious material by mechanical activation is provided, belonging to the technical field of solid waste resource treatment. The method includes following steps: grinding and activating water-quenched slag from lead smelting, then mixing with calcium-based solid waste, magnesium-based solid waste, magnesium oxide, portland cement and water, and performing a steam curing and a curing at normal temperature on cementitious material slurry obtained to obtain the lead smelting water-quenched slag-based cementitious material.

Abstract: Methods and systems for reclaiming materials from a mixed waste landfill containing coal combustion byproducts (CCBs) are disclosed. The methods and systems can be used to reclaim CCBs from ponds or dry landfills by obtaining mixed waste, crushing the mixed waste to form crushed mixed waste, drying the crushed mixed waste to form dried crushed mixed waste, and combining the dried crushed mixed waste with other compounds to form a blend. The blends can then be incorporated into a cement material, which may be used to form concrete.

Abstract: A concrete structure includes a continuous fiber-reinforced polymer material arranged as a main reinforcing material or a tendon. A short fiber reinforcing material consisting of an organic fiber is mixed in 0.5% or more with respect to an entire volume. The continuous fiber-reinforced polymer material is shaped like a rod or a stranded wire. A ratio Lf/Gm between a fiber length Lf of the organic fiber of the short fiber reinforcing material and a maximum aggregate diameter Gm of a concrete composition is 1.2 to 3.7, and an aspect ratio Lf/De, in which De is an equivalent diameter that is a cross-sectional area of the organic fiber converted into a circle diameter, is 30 to 69.

Abstract: A monomer composition containing an unsaturated polyalkylene glycol ether-based monomer is provided having excellent stability. The monomer composition contains an unsaturated polyalkylene glycol ether-based monomer represented by the following chemical formula (1): YO(R1O)nR2??(1) [in the formula, Y represents an alkenyl group having 2 to 7 carbon atoms; R1O represents one or two or more types of oxyalkylene groups having 2 to 18 carbon atoms; n represents an average addition, mole number of oxyalkylene groups and is a number of 5 to 500; and R2 represents a hydrogen atom, or a hydrocarbon group having 1 to 30 carbon atoms], an organic acid, and water, and having a pH of 4 to 13.

Abstract: There are provided processes for removing H2S from a gas. The processes comprise contacting the gas with an aqueous composition comprising at least one calcium compound, thereby obtaining CaS and a H2S lean treated gas stream, while maintaining the pH at about 9.5 to about 13.0; and contacting the CaS with an aqueous oxidant solution, converting the CaS into at least one of CaSO3 and CaSO4, while maintaining the pH at about 9.5 to about 13.0.

Abstract: Disclosed is a method and system for producing a hydraulic binder by processing of a silicate-containing component with at least one of calcium silicate hydrate- or belite-containing components. The method includes comminuting the silicate-containing component to a particle sizes of <100 ?m, with at least partial breaking of Si—O—Si bonds and/or hydrogen bonds in the structure of the surface layer of the silicate-containing component, for surface activation. The method further includes contacting the comminuted silicate-containing component with calcium silicate hydrate- and/or belite-containing components to cause the calcium silicate hydrate- and/or belite-containing components to accumulate on at least 50% of the surface area of the silicate-containing carrier substance.

Abstract: A monomer composition containing an unsaturated polyalkylene glycol ether-based monomer is provided having excellent stability. The monomer composition contains an unsaturated polyalkylene glycol ether-based monomer represented by the following chemical formula (1): YO(R1O)nR2??(1) [in the formula, Y represents an alkenyl group having 2 to 7 carbon atoms; R1O represents one or two or more types of oxyalkylene groups having 2 to 18 carbon atoms; n represents an average addition mole number of oxyalkylene groups and is a number of 5 to 500; and R2 represents a hydrogen atom or a hydrocarbon group having 1 to 30 carbon atoms], an organic acid, and water, and having a pH of 4 to 13.

Abstract: A solidification and setting accelerator for hydraulic binders, in particular for shotcrete/gunite or sprayed mortar, comprises sulfate, aluminum and at least two chemically distinct organic acids, each of which contains at least one hydroxy group in addition to at least one acid group, the combined maximum content of the at least two organic acids being 1 wt % in relation to the total weight of the accelerator.

Abstract: The invention relates to the use of calcium nitrate for producing a cementitious composition and/or a cementitious solid at high ambient temperatures. The invention is directed to ensuring sufficient hydration by a limitation of the maximum hydration temperature.

Abstract: A well system can include a well tool with a retarder chemical. The retarder chemical is released from the well tool into an annulus and retards setting of cement therein. A method of retarding setting of cement at a location in an annulus can include releasing a retarder chemical from a well tool connected in a casing string, after the cement is placed in the annulus. A well tool can include a valve that controls fluid communication via a port between an exterior of the tool and a flow passage extending through the tool, an annular recess, and a dispersible annular exterior component received in the recess. Another well tool can include a valve that controls fluid communication between an exterior of the tool and a flow passage extending through the well tool, an internal chamber, and a retarder chemical in the chamber.

Abstract: To minimize harmful effects on operation due to scale adhesion while accommodating increase in the amount of generated chlorine bypass dust and suppress facility cost and running cost including medical agent cost low when incineration ash and dust contained in extracted cement kiln combustion gas are subject to water treatment. [Means for Solving Problems] A water treatment system 1 comprising: a dissolution tank 32 for dissolving a fly ash A in a water W; a dissolution tank 22 for dissolving a dust D contained in combustion gas extracted from a kiln exhaust gas passage running from an inlet end of a cement kiln to a bottom cyclone in a water W; and a vertical filter press 11 for separately filtering a slurry S2 fed from the dissolution tank 32 and a slurry S1 fed from the dissolution tank 22 from each other.

Abstract: The present invention is mainly aimed at a set-accelerating admixture for hydraulic compositions comprising, in an aqueous solution, the reaction product of an alkanolamine with a concentrated strong acid; sulfate anions; and alkali or alkaline earth cations; having a pH comprised between 5 and 12. Moreover it is directed to a method for its preparation as well as to a method for preparing hydraulic compositions comprising the step for adding such an admixture to the hydraulic binder, before, during or after the grinding.

Abstract: A domestic appliance filter for use in a laundry treatment device includes a basic filter material with a hydrophobic coating for filtering out matter from a process water duct or a process air duct. The basic filter material includes a material which is resistant to temperatures of 160° C. or more and the hydrophobic coating on the basic filter material effects a surface energy of less than 35 mN/m.

Abstract: A fast hydraulic binder comprising cement, at least one first superplasticizer, a calcium salt, and at least one second superplasticizer different from the first superplasticizer and comprising a main chain and pendant groups connected to the main chain adapted so as to separate from the main chain in a basic medium, wherein the result is that the second plasticizer has a fluidifying action which increases at least temporarily over time in a basic medium.

Abstract: The invention relates to additives for hydraulic binders and systems such as concrete and mortar produced therefrom. More particularly, the present invention relates to a setting and curing accelerator for hydraulic binders produced by reacting a calcium compound CV with a silica sol SL.

Abstract: A method for treating cement kiln dust is provided. The method includes the steps of receiving cement kiln dust (CKD) from a kiln; heating the collected CKD; forming a gas stream of vaporized metal and CKD by sufficient heating to separate at least one heavy metal from the collected CKD stream to create a cleaned CKD stream and a metal stream; providing a water soluble alkaline-earth metal polysulfide; combining the heavy metal stream with the water soluble alkaline-earth metal sulfide to create a combined stream; and removing at least a portion of one heavy metal from the combined stream.

Abstract: The invention relates to a method of making a particulate material comprising; providing mineral wool base material in a form having size at least 80% not more than 40 mm, subjecting the mineral wool base material to sintering by use of a pulse combustor and thereby forming a particulate material in the form of particles having size at least 80% not more than 20 mm. An apparatus for carrying out the method comprises means for size reduction of coherent mineral wool substrate and a reaction chamber in communication with a pulse combustor.

Abstract: Inorganic polymer compositions and methods for their preparation are described herein. The compositions include the reaction product of a reactive powder, an activator, and optionally a retardant. The reactive powder includes fly ash, calcium sulfoaluminate cement, and less than 10% by weight portland cement. In some examples, the composition is substantially free from alkanolamines. In some examples, the ratio of water to reactive powder is from 0.06:1 to less than 0.2:1. Also described herein are building materials including the compositions.

Abstract: A process for preparing a setting and hardening accelerator for mineral binders includes the following steps: a) reacting a calcium compound CV with a silicon compound SV, and b) adding an acidic compound having a molecular weight of not more than 200 g/mol, more particularly 40-100 g/mol.

Abstract: The present invention relates to a method for accelerating the hardening of hydraulic or latent hydraulic binders, wherein ternesite and an aluminum component are added to the binder, and relates to an additive that increasing early strength for hydraulic or latent hydraulic binders that contain ternesite and a non-hydraulically reactive aluminum component, and relates to the use of an additive comprising ternesite and an aluminum component for the purpose of accelerating the hardening of hydraulic or latent hydraulic binders.

Abstract: The present invention provides a method for making sand compositions wherein manufactured sand particles are pretreated with a clay-mitigating polycation and blended with natural sand particles that have washed to remove fines such that at least 90% of the natural sand particles are retained on a 75 micron sieve. Methods of the invention also involve the use of the blended pretreated sand for making concrete wherein the sand is combined with cement, a polycarboxylate type dispersant, a further amount of clay-mitigating polycation compound, and at least one hydryoxyl or hydroxyl carboxylic acid or salt compound.

Abstract: The invention relates to a reducing agent for the soluble chromate content of cement and to methods for the production thereof, which comprise concentrating an used sulfuric acid, containing iron (II) sulfate, and separating the sulfuric acid from the obtained precipitate which contains iron (II) sulfate.

Abstract: A foamed concrete having a density from 100 to 800 kg/m3 including by mass relative to the total mass of the concrete: a cement; water; from 0.01 to 5% of a water-reducing agent, plasticizer or superplasticizer; from 0.45 to 5% of a foaming agent relative to the amount of water; from 0.01 to 5% of a water-soluble calcium salt; inorganic particles from 0.1 to 300 ?m in size; the ratio of foaming agent to calcium salt being from 0.3 to 0.8; the foamed concrete including 10% or more by mass of slag.

Abstract: A foamed concrete having a density from 100 to 800 kg/m3 including by mass relative to the total mass of the concrete: a cement; water; from 0.01 to 5% of a water-reducing agent, plasticizer or superplasticizer; from 0.45 to 5% of a foaming agent relative to the amount of water; from 0.01 to 5% of a water-soluble calcium salt; inorganic particles from 0.1 to 300 ?m in size; the ratio of foaming agent to calcium salt being from 0.3 to 0.8; excluding foamed concretes including 10% or more by mass of slag.

Abstract: The present invention provides a cement slurry composition, containing a hydraulic cement material, (A) a first water-soluble low molecular weight compound and (B) a second water-soluble low molecular weight compound differing from the compound (A), wherein a combination of the compounds (A) and (B) is (I) the compound (A) selected from cationic surfactants and the compound (B) selected from anionic aromatic compounds; or (II) the compound (A) selected from cationic surfactants and the compound (B) selected from brominated compounds, and in the compound (A), a ratio of compounds having a hydrocarbon group of 18 or more carbon atoms is not less than 45% by weight.

Abstract: In a method for processing and utilizing bypass dust obtained during the production of cement, it is proceeded as a) contacting the bypass dust with an aqueous phase and mixing the same to obtain a homogenous slurry, with water-soluble components of the bypass dust being dissolved in the aqueous phase, b) carrying out a solid-liquid separation to separate the solids contained in the slurry so that a brine is remaining, c) separating heavy metals present in the brine and precipitating calcium as poorly soluble calcium salts, e.g. CaCO3, to obtain a processed brine, and d) subjecting the processed brine to a fractional crystallization.

Abstract: A joint compound with improved crack resistance is formed by combining water, a filler such as calcium carbonate, a latex emulsion binder, a thickening system such as methylhydroxyethyl cellulose, and nanocrystalline cellulose. The nanocrystalline cellulose is provided in an amount effective to reduce the crack formation during drying.

Abstract: Methods and compositions are disclosed that comprise interground perlite and hydraulic cement. An embodiment provides a method of cementing comprising: providing a settable composition comprising perlite, hydraulic cement, and water, wherein the perlite and hydraulic cement are interground prior to combination with the water to form the settable composition; and allowing the settable composition to set.

Abstract: A catalyst composition for pozzolan compositions, includes: a) one or more chlorides, selected from the group consisting of: sodium chloride, potassium chloride, magnesium chloride, calcium chloride, strontium chloride, barium chloride and/or ammonium chloride, preferably ammonium chloride; b) aluminum chloride, and c) one or more metal oxides, preferably selected from the group consisting of: oxides from metals from Group II of the Periodic Table, oxides from metals from Group VIII B of the Periodic Table (e.g. iron oxide), more preferably oxides from metals from Group II of the Periodic Table, even more preferably magnesium oxide or calcium oxide, most preferably magnesium oxide. The use of the catalytic composition for addition to cement for oil well cementing, and for lowering the pH of cement, a method for obtaining a composition for reinforcing cement, a binder composition and a construction composition are also described.

Abstract: The present invention provides a liquid rheology modifier containing compounds (A) and (B) selected from combination (1) of compound (A) selected from cationic surfactants and compound (B) selected from anionic aromatic compounds and combination (2) of compound (A) from cationic surfactants and compound (B) selected from brominated compounds; and dicarboxylic acid (C).

Abstract: An activator composition, in particular suitable for activating latent hydraulic and/or pozzolanic materials in binder compositions, includes: a first component A, including an alkali metal salt and/or an earth alkali metal salt; a second component B, including a metal sulfate; optionally, a third component C, suitable for accelerating the hardening of a hydraulic binder material; and optionally, a filler material; with at least the components A, B and C, if present, being chemically different.

Abstract: An inorganic board contains, in a solid content ratio, 30 to 70 mass % of hydraulic material, 5 to 15 mass % of reinforcing fiber, and 1 to 30 mass % of wollastonite having a wet volume (after being allowed to stand for 30 minutes) of 15 to 45 ml. Also, a method includes: step of producing a slurry containing hydraulic material, reinforcing fiber, and wollastonite; step of producing a sheet by dehydrating the slurry; and step of pressing and curing the sheet; wherein, in the step of producing a slurry, a composition of the slurry is set so as to contain, in a solid content ratio, 30 to 70 mass % of hydraulic material, 5 to 15 mass % of reinforcing fiber, and 1 to 30 mass % of wollastonite having a wet volume (after being allowed to stand for 30 minutes) of 15 to 45 ml.

Abstract: A method of cementing in a subterranean formation comprising the steps of: (A) introducing a cement composition into the subterranean formation, the cement composition comprising: (i) cement; (ii) water; and (iii) a high-density additive selected from the group consisting of silicon carbide, sintered bauxite, and any combination thereof, wherein the cement composition has a density of at least 16 pounds per gallon; and (B) allowing the cement composition to set. According to an embodiment, the high-density additive is in a concentration of at least 30% by weight of the cement. A cement composition for use in an oil or gas well comprises: (A) cement; (B) water; and (C) a high-density additive selected from the group consisting of silicon carbide, sintered bauxite, and a combination thereof, wherein the high-density additive is in a concentration of at least 30% by weight of the cement, and wherein the cement composition has a density of at least 16 pounds per gallon.

Abstract: An exemplary composition for enhancing water repellency in cementitious material comprises a hydrophobic material solute that is dissolved in a glycol ether solvent. Thus, the composition is provided in the form of a non-aqueous solution or emulsion wherein water is in a noncontinuous phase. The use of such compositions to modify cementitious compositions and the cementitious materials obtained thereby are also described.

Abstract: New photocatalytic product comprising compounds of titanium integrated with limestone. The product is obtained by reacting limestone with a suitable precursor of titanium dioxide in a basic solution, recovering the product in particular conditions, drying it and calcining it. By operating in presence of sodium, a composite is obtained substantially free from titanium dioxide, containing limestone and calcium titanate. The composite thus obtained, used as such or in mixture with other components, has shown an unexpectedly high photocatalytic activity.

Abstract: New photocatalytic product comprising compounds of titanium integrated with limestone. The product is obtained by reacting limestone with a suitable precursor of titanium dioxide in a basic solution, followed by accurately washing the solid obtained, drying it and calcining it. A composite is obtained containing limestone, titanium dioxide and calcium titanate. The composite thus obtained, used as such or in mixture with other components, has shown an unexpectedly high photocatalytic activity.

Abstract: Synthesis gas is more effectively produced from the underground gasification of coal from a coal seam when the casing lining is cemented with a cementitious slurry containing a cementitious material, graphite and an aluminum silicate, such as metakaolin. The cementitious slurry of the cement mix sets as a cement sheath at bottomhole static temperatures less than or equal to 65° C. The set cement may withstand extreme dry heat temperatures which are greater than or equal to 800° C.

Abstract: This invention relates to a new class of chemical admixtures for hydraulic cement compositions such as pastes, mortars, grouts and concretes. The cement compositions are comprised of ordinary Portland cement, blended cements, or non-Portland cements made with Supplementary Cementitious Materials. The admixtures contain complexes of metals with derivatives of hydroxycarboxylic acids, and improve properties of cement compositions, including setting, hardness, compressive strength, shrinkage, and freeze-thaw resistance. The invention discloses a method for improving the properties of hydraulic cements by adding the disclosed chemical admixtures to cement compositions, and also discloses methods of preparing said admixtures.

Abstract: A cement retarder system for use in underground wells included a borate compound, an organophosphonate salt, and a copolymer formed from AMPS and a monomer selected from the group consisting of acrylic acid, acrylamide and mixtures thereof.

Abstract: Microparticles having crystalline needle or rod-shaped structures of, for example, an ettringite mineral grown and attached radially from their surface. A method including nucleating and growing crystalline needles/rods from the surface of a particle in the presence of a solution of calcium, sulfur, and aluminum such as calcium sulfoaluminate, lime and calcium sulfate is described. One example is the radial growth of ettringite needles on the surface of fly ash particles in calcium sulfoaluminate-based cement paste and concrete.

Abstract: In accordance with the present invention, there is provided a treat chlorine bypass dust while preventing increases in chemical cost and concentrations of heavy metals in clinker, and ensuring stability in quality of cement. In a chlorine bypass facility 1 extracting a part G of combustion gas, while cooling it, from a kiln exhaust gas passage, which runs from an inlet end of a cement kiln to a bottom cyclone, and recovering a high chlorine concentration chlorine bypass dust D5 from the extracted gas G1, a slurry S containing chlorine bypass dust and SO2 gas or/and CO2 gas are contacted with each other to obtain solid content. The slurry containing chlorine bypass dust and an exhaust gas from the chlorine bypass facility or/and the exhaust gas from the cement kiln can be contacted with each other, and the solid content can be fed to a cement finishing process, which allows cement with low CaO and Ca(OH)2 contents and with stable property such as setting time to be produced.

Abstract: A method for reducing the particle size of a pozzolanic material includes providing a pozzolanic material having an initial particle size and heating the pozzolanic material to cause a portion of the particles to at least partially fracture. Fracturing the particles creates a plurality of fissures that define sub-particles within the particles. The method also includes processing the fractured pozzolanic material to separate the sub-particles, thereby yielding the pozzolanic material having reduced particles.

Abstract: An embodiment of the present invention comprises a method of cementing comprising: placing a settable composition into a well bore, the settable composition comprising unexpanded perlite, cement kiln dust, and water; and allowing the settable composition to set. Another embodiment of the present invention comprises a method of cementing comprising: placing a settable composition into a well bore, the settable composition comprising ground unexpanded perlite, Portland cement interground with pumicite, and water; and allowing the settable composition to set. Yet another embodiment of the present invention comprises a settable composition comprising: ground unexpanded perlite; cement kiln dust; and water.

Abstract: The invention relates to a method for producing a coated basic material for a hydraulic composition (11) comprising a basic material (14, 16) and water (15). According to the invention, the basic material can consist of several sub-groups (14, 16) and at least one hydraulic binding agent (14) and to produce the hydraulic composition the basic material (14, 16) and the water (15) are mixed in a mixer (8). Prior to the mixing of the hydraulic composition, the basic material (14, 16) is at least partially coated with an additive (13). The invention also relates to a coated basic material to be used in concrete production, to an additive for concrete production and to a method for producing a hydraulic composition.

Abstract: A lightweight artificial stone system comprises a plurality of artificial stones, each of the artificial stones formed of at least some portion of cement, expanded glass, and styrene, the lightweight artificial stones having a density in the range of between about 30 and 70 pounds per cubic foot, each of the stones having six sides and including a first height dimension and a second width dimension, each of the height and width dimensions having a length unit being substantially a multiple of two, each of the stones having four ninety degrees corners and four of the six sides having a smooth surface to provide tight, cement-free seams between adjacent stones, the tight, cement-free seams inhibiting viewing of structure behind said plurality of artificial stones, each of the stones being of such a light weight so as to be held in position in the system by a lath-less and cement-free adhesive.

Abstract: A method and system for producing modified coal combustion products are disclosed. The additives reduce the particle sizes of the coal combustion product and may reduce the amount of un-burned carbon in the coal combustion product, making the modified product useful as an addition to cementitious materials.

Abstract: An embodiment of the present invention comprises a method of cementing comprising: placing a settable composition into a well bore, the settable composition comprising unexpanded perlite, cement kiln dust, and water; and allowing the settable composition to set. Another embodiment of the present invention comprises a method of cementing comprising: placing a settable composition into a well bore, the settable composition comprising ground unexpanded perlite, Portland cement interground with pumicite, and water; and allowing the settable composition to set. Yet another embodiment of the present invention comprises a settable composition comprising: ground unexpanded perlite; cement kiln dust; and water.

Abstract: The invention encompasses an ultrafine NFS powder wherein the particle size is sufficiently small as to increase the proportion of the reactive glassy silicate phase in the NFS, methods of making the ultrafine NFS powder, and cementitious products which use the ultrafine NFS powder. The invention also encompasses pozzolanic binders produced by fine grinding non-ferrous smelter slags, as well as methods for processing the non-ferrous slags wherein various chemical additives, such as pH increasing additives, are added to the binders to increase the strength of compositions for uses such as mine backfill or grout mixtures.

Abstract: In the treatment method for converting chlorine-containing waste into raw material for cement, fly ash and desalinated dust are treated, harmful substances such as selenium or heavy metals are removed from the chlorine-containing waste which is the fly ash or desalinated dust by a polymer flocculant or a chelating agent, or by a reducing agent, a polymer flocculant, and electrolytic treatment, and solid components that are generated during the treatment is used as the raw material for cement.

Abstract: A method of controlling release of an admixture in a cement-based composition involves intercalating an admixture (e.g. an accelerator, a set retarder, a superplasticizer) for the cement-based composition into a layered double hydroxide or mixture thereof. A cement-based composition prepared in such a manner and containing a cement-based material (e.g. cement, mortar or concrete) has better workability, especially in respect of slump-loss characteristics.