Abstract: A method of producing a water resistant fiber-cement product. The water repelling agent can be added or applied to the fiber-cement or indeed the material forming the fiber cement at a number of different stages in the process. The resultant material has increased water impermeability over conventional fiber-cement products.

Abstract: A cementitious slurry comprising fly ash having a predominant particle size of up to about 10 microns, and/or aluminous material having a predominant particle size of up to about 150 microns. The additive acts as a water reduction agent and can replace either wholly or partially a conventional plasticizer.

Abstract: A lightweight concrete composition containing from 10 to 90 volume percent of a cement composition, from 10 to 90 volume percent of particles having an average particle diameter of from 0.2 mm to 8 mm, a bulk density of from 0.03 g/cc to 0.64 g/cc, an aspect ratio of from 1 to 3, and from 0 to 50 volume percent of aggregate; where the sum of components used does not exceed 100 volume percent, and where after the lightweight concrete composition is set it has a compressive strength of at least 1700 psi as tested according to ASTM C39 after seven days. The concrete composition can be used to make concrete masonry units, construction panels, road beds and other articles.

Abstract: A cement suspension includes the following, in relation to the cement material: water (22-35% by weight); acetic acid (1-10% by weight); plasticizer (up to 8% by weight); and dispersant agent (0-2% by weight), having an apparent viscosity of 0.5-2 Pa·s for the casting speed gradient. Pieces of cement that are prepared from the suspension and which can be used as electronic components are also disclosed.

Abstract: The invention relates to the use of lithium glycerophosphate for treating structures made of a cement-based product and having steel rebars, making it possible to inhibit rebar corrosion, to prevent the alkali reaction and to avoid the presence of alkalis and sulfates in the structure.

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: The use of silicate as a retarder enhancer at appropriate levels to enhance the retarding effect of retarders at high temperatures encountered downhole while accelerating the set of cement at lower temperatures encountered near to the surface.

Abstract: Flowable concrete mixtures have an aqueous foam admixture mixed therein to give the concrete mixture desired strength, flowability, and density. The concrete mixtures include a hydration stabilizer to stabilize the aqueous foam. The hydration stabilizer inhibits the reaction between the hydraulic cement and the water in the aqueous foam. The aqueous foam can be further stabilized using a fluorochemical surfactant. Preferred fluorochemical surfactants comprise an oligomer having at least one hydrophilic nonionic monomer and at least one hydrophilic anionic monomer.

Abstract: Provided herein are defoaming agents that comprise lecithin and a solvent. Optionally, they may comprise hydrophobic particles. One embodiment provides a defoaming agent that comprises lecithin and a solvent.

Abstract: A concrete which includes in parts by weight: 100 Portland cement; 50 to 200 of a sand having a single grading with a D10 to D90 between 0.063 and 5 mm, or a mixture of sands, the finest sand having a D10 to D90 between 0.063 and 1 mm and the coarsest sand having a D10 to D90 between 1 and 4 mm; 10 to 50 of a particulate, substantially non-pozzolanic material having a mean particle size less than 15 ?m; 0.1 to 10 of a water-reducing superplasticizer; and 10 to 30 of water; which concrete is substantially free of silica fume; the concrete having a compressive strength greater than 100 Mpa at 28 days.

Abstract: A lightweight cementitious composition containing from 22 to 90 volume percent of a cement composition and from 10 to 78 volume percent of particles having an average particle diameter of from 0.2 mm to 8 mm, a bulk density of from 0.03 g/cc to 0.64 g/cc, an aspect ratio of from 1 to 3, where after the lightweight cementitious composition is set it has a compressive strength of at least 1700 psi as tested according to ASTM C39. The cementitious composition can be used to make concrete masonry units, construction panels, road beds and other articles and can be included as a layer on wall panels and floor panels and can be used in insulated concrete forms. Aspects of the lightweight cementitious composition can be used to make lightweight structural units.

Abstract: A lightweight ready-mix concrete composition that contains 8-20 volume percent cement, 11-50 volume percent sand, 10-31 volume percent prepuff particles, 9-40 volume percent coarse aggregate, and 10-22 volume percent water, where the sum of components used does not exceed 100 volume percent. The prepuff particles have an average particle diameter of from 0.2 mm to 8 mm, a bulk density of from 0.02 g/cc to 0.64 g/cc, an aspect ratio of from 1 to 3. The slump value of the composition measured according to ASTM C 143 is from 2 to 8 inches. After the lightweight ready-mix concrete composition is set for 28 days, it has a compressive strength of at least 1400 psi as tested according to ASTM C39.

Abstract: A cement composition is provided including a cement and a low reactivity particle coated with a swellable polymeric material. The low reactivity particle is coated with a swellable polymeric material at a concentration of about 10 weight percent to about 50 weight percent, based on the weight of the cement. The swellable polymeric material swells to a larger volume when exposed to one or more hydrocarbons, depending on the selected polymeric material. The cement composition is used in a method as a self-sealing cement for cementing an oil and gas well, thereby minimizing or mitigating the unwanted migration of water or hydrocarbons.

Abstract: A lightweight concrete composition containing from 10 to 90 volume percent of a cement composition, from 10 to 90 volume percent of particles having an average particle diameter of from 0.2 mm to 8 mm, a bulk density of from 0.03 g/cc to 0.64 g/cc, an aspect ratio of from 1 to 3, and from 0 to 50 volume percent of aggregate; where the sum of components used does not exceed 100 volume percent, and where after the lightweight concrete composition is set it has a compressive strength of at least 1700 psi as tested according to ASTM C39 after seven days. The concrete composition can be used to make concrete masonry units, construction panels, road beds and other articles.

Abstract: Described herein is the use of new cementitious mortars with a high degree of fluidity and short consolidation times in the production of cementitious products by means of pouring in foundry moulds. The mortars used contain water, a fast-setting cement, fluidifiers and/or superfluidifiers, setting regulators, and aggregates having a specific granulometric distribution. The aggregates are made up of two fractions with different grain size such that the ratio between the characteristic grain diameters of the two fractions is comprised between 2.2 and 3.2. The new mortars thus obtained have values of fluidity 2-3 times higher than those of mortars produced with traditional aggregates.

Abstract: The invention relates to an ultra-high-performance, self-compacting light-colored concrete comprising: a cement; a mixture of calcined bauxite sands of different grain sizes, the finest sand having an average grain size of less than 1 mm and the thickest sand having an average grain size of less than 10 mm; optionally silica fume, whereby 90% of the particles thereof have a size of less than 1 ?m and the average diameter is approximately 0.5 ?m, said silica fume representing at most 15 parts by weight per 100 parts of cement; an antifoaming agent; water-reducing superplasticiser; optionally fibers; and water. The inventive concrete also comprises: ultrafine calcium carbonate particles having a specific surface area that is equal to or greater than 10 m2/g and a form factor (IF) that is equal to or greater than 0.3 and, preferably, equal to or greater than 0.4.

Abstract: A lightweight concrete composition containing from 10 to 90 volume percent of a cement composition, from 10 to 90 volume percent of particles having an average particle diameter of from 0.2 mm to 8 mm, a bulk density of from 0.03 g/cc to 0.64 g/cc, an aspect ratio of from 1 to 3, and from 0 to 50 volume percent of aggregate, where the particles contain an antimicrobial agent; where the sum of components used does not exceed 100 volume percent, and where after the lightweight concrete composition is set it has a compressive strength of at least 1700 psi as tested according to ASTM C39 after seven days. The concrete composition can be used to make concrete masonry units, construction panels, dining tables, counter surfaces, bench tops, and/or examination tables as well as other articles.

Abstract: A method of compressing a composition includes compacting a hydraulic binder in a quantity greater than 95% by weight and a disintegrating agent in a quantity less than or equal to 0.5% by weight, into compacts in a roller press. The milled pellet of a composition including a hydraulic binder in a quantity greater than 95% by weight and a disintegrating agent in a quantity less than or equal to 0.5% by weight.

Abstract: The object of the present invention is to provide an inorganic board which has high mechanical strength, much improved dimensional stability, freezing and fusion resistance. To attain said object the present invention provides an inorganic board made of a cured material being a raw material mixture containing a cementitious inorganic material, a silica containing material, a woody reinforcement, and a water soluble synthetic resin, wherein the mass ratio of said cementitious inorganic material and said silica containing material is set to be in the range of between 35:65 and 45:55, to promote the hardening reaction of said inorganic board, and to reduce the unreacted materials, solving the problem of the retardation of the cement hardening by said water soluble synthetic resin.

Abstract: A viscosity modifying agent is added to a concrete mixture to give the concrete desirable rheological properties. The viscosity modifying agent is incorporated into a foam admixture before it is mixed into the concrete. Because the viscosity modifying agent is a component of the foam admixture, the viscosity modifying agent is dispersed in the aqueous film that forms the foam bubbles. The viscosity modifier in the foam bubbles gives the foam beneficial rheological properties. The viscosity modifier performs more efficiently when included in the foam bubbles as compared to being mixed directly into the concrete. The foam bubbles containing the viscosity modifier can be stabilized using a fluorochemical stabilizer, which is included in the foam admixture. The foam bubbles can be further stabilized with respect to cement mixtures by including a hydration stabilizing in the cement mixture.

Abstract: To provide a spraying material having an excellent quick-setting property and excellent adherability, a small alkali amount and excellent initial strength development, and a spraying method using it. The spraying material comprises a liquid quick-setting admixture containing an aluminum source, a sulfur source and a fluorine source, one or more quick-setting aids selected from the group consisting of calcium aluminate, calcium sulfoaluminate, calcium aluminosilicate, an alkali metal-containing substance, calcium hydroxide and aluminum hydroxide, and a cement concrete, and the method is to spray this spraying material.

Abstract: Methods of reducing hydroxyl ions in concrete pore solutions are provided. Such methods are useful in providing resistance to gels which form in concrete due to the alkali-silica (ASR) reaction. The methods comprise, in one aspect, adding a salt, in aqueous or solid form, to the concrete, the salt having a cation higher in valence than the anion. In other aspects, the methods of the present invention comprise adding an acidic phosphate or a silicon-containing alkoxide to the concrete. All of the above methods are useful in reducing hydroxyl ions in concrete. Such methods can be used to resist ASR in fresh concrete, in concrete that is setting, or in hardened concrete. Methods are also provided for mitigating ASR while simultaneously healing cracks in concrete or bonding new concrete to existing concrete. The methods involve reacting an Si-containing alkoxide with a source of reactive calcium to produce calcium silicate hydrate.

Abstract: A dense mortar includes: (i) an ettringite binder, including calcium sulphate and a calcium aluminate mineral compound, (ii) at least one poly(alkylene oxide) comb polymer and, (iii) at least one organic resin, the organic resin accounting for less than 2% by weight of the mortar.

Abstract: The invention relates to the composition of fresh concrete and admixtures for fresh concrete and can be used in the construction industry for producing monolithic and precast concrete and reinforced concrete structures, in spraying mixtures and also in the oil extraction industry when producing injection and insulation cement materials.

Abstract: A dry cast cementitious composition including cement, water, and a rheology modifying additive (RMA) is provided. The inclusion of the RMA improves the dry cast cementitious composition's response to vibration and dampens out differences due to minor fluctuations in initial slump of the composition. The RMA may include a dispersant for the dry cast cementitious compositions. The dry cast cementitious composition may optionally include other admixtures or additives known in the industry. Methods for making the dry cast cementitious composition and dry cast cementitious articles from the composition are also provided.

Abstract: The prevention of latex inversion in saltwater cement compositions for use in subterranean formations by inclusion of a combination of latex stabilizers and associated methods of cementing. Saltwater cement compositions comprising saltwater, a cement, a latex, a first latex stabilizer comprising a surfactant having the formula: R—O—(OCH2CH2)mXM wherein R is an alkyl group having in the range of from about 10 carbons to about 20 carbons, m is an integer in the range of from about 10 to about 40, X is OSO3 or SO3, and M is a compatible cation, and a second latex stabilizer comprising an alcohol ether sulfate having the formula: R1—O—(OCH2CH2)nOSO3M wherein R1 is an alkyl group having in the range of from about 4 carbons to about 12 carbons, n is an integer in the range of from about 1 to about 10, and M is a compatible cation.

Abstract: A strength improvement admixture composition is provided that increases the compressive strength of cementitious compositions without negatively increasing the setting time. The admixture comprises the components of a polycarboxylate dispersant and strength improvement additive.

Abstract: The invention relates to a method for the accelerated dehydration of sludges in sludge disposal areas, especially of sludges from rivers and harbors, by the exclusive use of anionic polymer flocculants and the use of materials obtained according to the inventive method.

Abstract: A cover composition that can be applied to a bulk material pile, such as landfill refuse, to protect the pile from wind, precipitation, and access by animals and insects is provided. The cover composition is a mixture of a liquid, typically, water; bentonite clay; and synthetic fibers. The composition may be enhanced by the addition of one or more of the following additives: Portland cement, pregelatinized wheat starch, synthetic polymers, soda ash, and latex paint. Unlike prior art cover compositions, the disclosed composition adheres well to waste material, most notably plastics, whereby the composition is easy to apply and provides a substantially uniform, durable protective cover to landfill refuse piles and other bulk materials. Methods of applying the composition to bulk material piles are also disclosed.

Abstract: Cement compositions comprising flexible, compressible beads, processes for preparing such cement compositions, and methods of cementing in subterranean formations using such cement compositions. One or more flexible, compressible beads are mixed with the cement before pumping the cement into a well bore. The flexible, compressible beads are preferably composed of an elastomeric material such as a copolymer of methylmethacrylate and acrylonitrile; a terpolymer of methylmethacrylate, acrylonitrile, and dichloroethane; a styrene-divinylbenzene copolymer; and polystyrene. The flexible, compressible beads may be heated to expand the beads before mixing with the cement such that the ensuing cement composition will have a desired density. Non-flexible beads such as spherulites may also be added to the cement compositions.

Abstract: Cement compositions may comprise one or more secondary amines substituted with a carboxyl group or salts thereof (e.g., 3-hydroxy N,N?-iminodisuccinic acid) for retarding the setting of such compositions. The inclusion of such materials in cement compositions may be highly beneficial. In wellbores having BHCT's of less than or equal to about 250° F., the use of the secondary amine as the set retarder ensures that the thickening time of the cement composition is sufficient to allow the cement composition to be pumped to its desired downhole location. Further, the secondary amine may be used in combination with conventional set retarders to enhance the ability of those retarders to increase the thickening time of the cement composition at higher BHCT's, e.g., from about 250° F. to about 525° F.

Abstract: Ceramic precursor compositions and chemically bonded ceramic (CBC) materials, especially Ca-based, and a composite biomaterial suitable for orthopaedic applications. The CBC-system includes a binding phase (chemical cement) and additional phases with specified chemistry imparting to the biomaterial the ability of initial strength followed by interaction with the body tissue including body liquid, to form a resorbable or partly resorbable biomaterial. The ceramic precursor composition includes at least one silicate with Ca as the main cation with a resorption rate less or equal to that of the bone in-growth rate. The silicate will form the binding phase of the cured material. Implants and surface coated devices are also disclosed. The cured material exhibits a compressive strength exceeding 100 MPa.

Abstract: Cementitious compositions are provided that can be use in drilling oil and gas well applications. The compositions include a source of hydraulically settable cement, calcium carbonate, free lime and alkali ions, calcium sulfate and an organic component. Methods for cementing a casing and liners and for remedial operations such as plugging back and squeeze cementing are also provided.

Abstract: A chemically bonded biomaterial element composed of an inorganic cement, exhibiting minimal dimensional changes upon hardening and long-time use, improved mechanical properties and improved translucency. An algorithm to describe the micro-structure is expressed as ? = d * ( 1 - V F ) ( V F ) where ? is the distance between filler particles of mean size d, and VF is the volume content of non-reacted cement and added filler, and where ??10 ?m. The invention also relates to a device in connection with the preparation of a chemically bonded biomaterial element according to the invention.

Abstract: A cementitious composition is provided that is composed of hydraulic cement and a liquid coloring suspension. The liquid coloring suspension which contains polycarboxylate dispersant and pigment provides the cementitious composition with increased dispersion of pigment particles, lowered water content, and improved coloration over that observed in the prior art. Also, a liquid coloring suspension for cementitious compositions is provided which contains polycarboxylate dispersant, pigment, and thixotropic additive. The liquid coloring suspension increases the color of cementitious compositions, reduces the water content and has long term stability in that it does not become increasingly viscous over time.

Abstract: Cement compositions containing an expandable material are disclosed. The compositions are suitable for use in oil and gas wells. An example of such an expandable material is a polymer encapsulated chemical that expands upon heating. Examples of cement compositions containing polymer encapsulated isobutane or isopentane are disclosed. The use of cement compositions containing an expandable material can reduce the formation of micro-annulus or other deleterious physical properties in the set cement.

Abstract: A concrete for making articles such as fixtures, furniture and other accoutrements having high compressive and resistive strengths, good machining, cutting and abrasion resistance properties and an aesthetically pleasing finish. This concrete is obtained through mixing a composition comprising hydraulic binder, aggregate, pozzolan, a dispersant, fibers, a pozzonically reactive and/or inert filler, water and preferably a non-chloride set accelerator.

Abstract: An accelerated-curing concrete masonry unit (CMU) mixture includes aggregate material, hydraulic cement and spent blasting abrasive particles, and may also include paint residue particles. The abrasive particles or abrasive and paint particles combined preferably make up at least 5.0% of the mixture by volume. Preferably, the hydraulic cement is Portland cement and the abrasive or combined particles make up about 10.0% to 17.0% of the mixture by volume. The abrasive particles typically have a fineness modulus ranging from 0.6 to 1.5 and more preferably from 0.75 to 1.2. Plastic particles may make up some or all of the abrasive particles. CMUs formed with this mixture are substantially more water repellent than standard CMUs and have a water absorption often no greater than 9.0 pounds per cubic foot. Preferred CMUs have an average net compressive strength of over 2,500 psi while levels of 3,000 psi or 3,500 psi are not uncommon.

Abstract: According to various embodiments, gas-generating additives for use in a cement composition comprise: a gas-generating material at least partially coated with a mixture comprising a fatty acid ester of sorbitan, glycerol, or pentaerythritol and having a shelf life of about 12 months or greater. The gas-generating additives may also include a C8-C18 hydrocarbon. In more embodiments, cement compositions comprise: a gas-generating material at least partially coated with a mixture comprising a fatty acid ester of sorbitan, glycerol, or pentaerythritol and a C8-C18 hydrocarbon for increasing a shelf life of the gas-generating material. In yet more embodiments, cement compositions comprise: a cement; a fluid for making the cement composition pumpable; a hydrogen-generating material at least partially coated with a mixture for delaying a hydrogen-generating reaction, the mixture comprising sorbitan monooleate and an isoparaffin.

Abstract: A cement composition for which the mechanical properties of the set cement can be controlled independently of the slurry density, both at high density (>16 ppg) and at low density (<12 ppg) comprises a trimodal blend of particulate materials present as fine, medium and coarse particule size fractions, the particulate materials including cement, flexible particles, and a filler, characterized in that the cement comprises the fine particle size fraction, and the flexible particles and filler comprise the medium and large particle size fractions.

Abstract: The invention concerns a fast binder comprising; cement; at least one superplasticizer; calcium nitrite; and at least one formic derivative. The invention also concerns concrete mixtures obtained from said binder and methods for making same.

Abstract: A hydraulic composition of the present invention includes (A) 100 parts by weight of cement having a Blaine specific surface area of 2,500 to 5,000 cm2/g, (B) 10 to 40 parts by weight of fine particles having a BET specific surface area of 5 to 25 m2/g, and (C) 15 to 55 parts by weight of inorganic particles having a Blaine specific surface area which is 2,500 to 30,000 cm2/g and which is larger than that of the cement. The inorganic particles (C) may comprise 10 to 50 parts by weight of inorganic particles (C1) having a Blaine specific surface area of 5,000 to 30,000 cm2/g and 5 to 35 parts by weight of inorganic particles (C2) having a Blaine specific surface area of 2,500 to 5,000 cm2/g.

Abstract: A wellbore servicing comprising a calcium aluminate cement and at least one gelation inhibitor wherein the calcium aluminate cement comprises less than about 50 wt. % alumina, greater than about 2 wt. % iron oxide, or both. A wellbore servicing composition comprising calcium aluminate cement and a gelation inhibitor, wherein the gelation inhibitor comprises a copolymer comprising one or more sulfonated aromatic monomers and one or more acrylate monomers. A wellbore servicing composition comprising calcium aluminate cement and a gelation inhibitor, wherein the gelation inhibitor comprises a copolymer comprising alkylbenzene sulfonic acid, at least one methally sulfonic acid monomer; at least one copolymerizable nonionic monomer, and at least one copolymerizable olefinically unsaturated carboxylic acid monomer.

Abstract: A method of producing a water resistant fiber-cement product. The water repelling agent can be added or applied to the fiber-cement or indeed the material forming the fiber cement at a number of different stages in the process. The resultant material has increased water impermeability over conventional fiber-cement products.

Abstract: This invention is a composition comprising an admixture of one or more cementitious component(s) and one or more cellulosic component. The cellulosic components comprise a defined size and a defined aspect ratio and an amount of water which is within a range effective to impart characteristic in a final hardened product. Importantly, the present invention allows the reduction/elimination of the aggregate and sand content of concrete and similar material without loss of associated properties. Unexpectedly, there are significant improvements of some of the properties.

Abstract: Cementitious slurries capable of controlling and/or preventing strength retrogression during the cementing of a formation contain a bismuth salt or derivative thereof. Bismuth trioxide is preferred. The cementitious slurry may further contain a density modifying agent and/or strength enhancer. The cementitious slurries of the invention are suitable for use over a broad temperature range of from about 45° F. to about 500° F.

Abstract: A method of cementing a wellbore comprising preparing a cement composition comprising a water-soluble aromatic sulfonated polymer, and placing the cement composition into the wellbore, wherein the cement composition develops a compressive strength of greater than about zero in less time than a similar cement composition having a comparable thickening time and lacking a water-soluble aromatic sulfonated polymer. A cement composition comprising a water-soluble aromatic sulfonated polymer, wherein the cement composition develops a compressive strength of greater than about zero in less time than a similar cement composition having comparable thickening time and lacking a water-soluble aromatic sulfonated polymer.

Abstract: A method is provided for reducing the density of a well cement composition for cementing in a subterranean formation. The method comprises providing a cement composition that comprises water and a cement, and then adding an additive comprising an anionic foam stabilizer and an anionic foaming agent or a Zwitterionic foam booster. A gas is added to this mixture to reduce the density. Further, foamed cement compositions and additives for foaming and stabilizing a well cement composition are provided.

Abstract: Cement compositions containing low reactivity materials are disclosed. The compositions are useful in conditions involving high temperatures, high pressures, and tectonic forces such as oil and gas wells. The cement compositions display increased compressive strength, flexural strength, and tensile strength. Fractures appear to occur in a non-linear fashion between the Interfacial Transition Zone (ITZ) of the particles, rather than in a straight line such as those observed in conventional cement materials.

Abstract: A concrete building block containing Portland cement, a filler, water, and a quantity of particularly sized plastic particles, such as spent abrasive particles of a thermoset plastic. The associated method of producing such blocks eliminates the need of curing the blocks in a heated humidity controlled environment in order for the blocks to attain the required water content for hydration of the cement.