Abstract: A cement composition containing cement, water, and a silanol terminated polysiloxane, and cured products thereof exhibiting improved thermal stability and dielectric constant.

Abstract: Cementitious composite materials having high strength, vacuum integrity, good thermal properties and low coefficient of thermal expansion are prepared from a mixture of(1) a high strength cement matrix, and(2) a filler component, comprising a metal fiber.These composites are useful in the manufacture of molds and tools for forming metals and plastics. A preferred composite mixture comprising Portland cement, chemically reactive silica particles, inorganic oxide particles, a cement superplasticizer, an irregularly shaped aggregate, metal fibers, and water. The mixtures preferably contain chemically reactive silica fume particles and reactive silica particles such as crystalline silica or quartz particles or a vitreous/glassy form of silicon. The mixtures preferably comprise stainless steel fibers and stainless steel aggregate. High nickel steel and silicon carbide can be used as aggregate in applications requiring low coefficient of thermal expansion.

Abstract: A method is described for producing a building element in which a hardenable binder-material is mixed with a coarse particles comprising material after which the mixture is used for forming unhardened building elements. The building elements are subsequently hardened at a temperature up to 100.degree. C. and at atmospheric pressure in a water-vapor containing atmosphere. The hardenable binder material is constituted by a separately prepared mixture of fly ash; Ca(OH).sub.2 or a substance which may be converted into Ca(OH).sub.2, and water.Optionally the hardenable mixture may be partially granulated before use.

Abstract: Processes for the continuous preparation of high concentration sodium hypochlorite which controls sodium chloride formed to prevent fouling of heat exchanger equipment and to provide sodium chloride particle sizes on the order of 400 microns or greater to facilitate filtration and reduce the mother liquor retention in the salt, which processes comprise reacting in two stages pure chlorine or chlorine diluted with inert gases with a sodium hydroxide having a concentration of from about 20 to about 50 weight percent, in which the first stage of chloration of the sodium hydroxide is carried out in an absorption column wherein the concentration of sodium hypochlorite and sodium hydroxide are respectively limited to 15% and 4.5% by weight, and in the second stage of chloration, the sodium hypochlorite solution leaving the absorption column is treated with pure chlorine or chlorine diluted with inert gases in a crystallizer equipped with suitable agitation.

Abstract: A method of suppressing dust generation emanating from cement clinker dust by applying a foamed dust control treatment thereto. The foam is provided with an effective defoaming agent which, upon slurrying of the clinker and other ingredients (e.g., sand, gypsum, aggregate) to form the desired mortar, inhibits foam formation in the mortar, thus not significantly increasing air entrapped in the slurried mortar.

Abstract: There is provided an anti-corrosive mixture for iron and steel surfaces which comprises (a) a mixture composed of 5 to 25% by weight (solid basis) of one or more kinds of aqueous emulsions or aqueous latices of styrene resin and 5 to 15% by weight (solid basis) of aqueous emulsion of asphalt, and (b) 60 to 90% by weight of at least one kind of inorganic powder selected from the group consisting of silica stone, silica sand, granite, andesite, shale, kaolin, feldspar, talc, mica, fly ash, slag, iron oxide and graphite. The inorganic powder may also contain 1 to 10% by weight of limestone powder. There is also provided a process for the manufacture of steam-cured aerated light-weight concrete while applying the above anti-corrosive mixture to the reinforcing steel bars used in that process.

Abstract: An improved refractory composition especially adapted for use as a gunning mix is made of aggregate (for example, periclase) and a bonding material (for example, aluminum sulfate, boric acid, and citric acid) to which is added attapulgite. The composition may also contain other materials, as is known in the art.

Abstract: The invention relates to an additive adapted to suppress free water in conditions of "over-dispersion" of the cement when cementing an oil well. This additive is selected from cerain metal soluble salts such as Mg, Ni, etc. This additive modifies neither the other properties of the slurry (in particular setting time) nor the action of other additives (in particular of retarders).

Abstract: Lubricant compositions having enhanced friction-reducing/antiwear properties are provided by incorporating therein minor amounts of a compound or mixture of compounds which are the reaction product(s) of hydroxyhydrocarbyl hydrocarbyl amines and phosphorus pentoxide.

Abstract: Heavy ceramic shaped material with a content of at least one of the components magnesia, fired dolomite, chromite and spinel, characterized by a microcrack system substantially homogeneously distributed in the shaped material structure, as well as process for producing such a heavy ceramic shaped material and the use thereof.

Abstract: A fluoride-containing bioactive glass composition suitable for bulk implant prosthetic devices and coatings for prosthetic devices, the bioactive glass compositions selected from glass formulations containing, by mole 46.1% SiO.sub.2, 2.6% P.sub.2 O.sub.5, 26.9% CaO and 24.4% Na.sub.2 O and glass formulations containing, by mole, 52.1% SiO.sub.2, 23.8% CaO, 21.5% Na.sub.2 O, 2.6% P.sub.2 O.sub.5 wherein, respectively, 30 to 50 molar percent and 40 to 60 molar percent of the CaO is substituted with CaF.sub.2. These fluoride-containing bioactive glass materials demonstrate high resistance to demineralization in physiological fluids as well as extensive apatite formation which shows a predominance of crystalline apatite of mixed phase character.

Abstract: A cementatious admixture for use either as a mortar, cement or concrete when added to water comprising a hydraulic cement, such as Portland cement, in combination with presized inorganic filler particles having a maximum particle size of about 50 microns and in a predetermined relationship by weight to the Portland cement. The added water must also satisfy a relationship to the weight of hydraulic cement to provide thixotropy and nondilatency.

Abstract: A sintered compact of cubic boron nitride is made by adsorbing and/or diffusing 0.005 to 1.000 percent by weight of water into a boron nitride compact containing alkaline earth metal boron nitride as a catalyst. The so prepared compact is then subjected to a treatment under high pressure at a relatively low temperature to form a dense cubic boron nitride sintered compact of high purity.

Abstract: A process for producing a low water-absorbing artificial lightweight aggregate, which comprises:granulating a starting powdery material containing coal ash, having such a particle size distribution that a residue on a 297 .mu.m standard wire sieve is not more than 1 wt. %, and 1 to 20 parts by weight of a hydraulic material per 100 parts by weight of said coal ash in the presence of water;curing the resulting granules for a period of not shorter than 20 hours; orheat-treating the resulting granules at a temperature of not higher than 700.degree. C. for a period of not shorter than 30 minutes; and,calcining the granules at a temperature of 1,000.degree. to 1,500.degree. C.

Abstract: The pozzolanic properties of a pozzolanic material, more particularly a fly ash, are improved by mixing the pozzolanic material with a calciumoxyde or calciumhydroxide containing material and water in such a way that at the time of associating or bringing together the abovementioned components the mixture has or immediately attains a temperature of more than 50.degree. C., preferably at least 80.degree. C., most preferably 85.degree. to 100.degree. C.A mixture of pozzolanic material and calciumoxyde and/or calciumhydroxide may be preheated, subsequently, water being added to said mixture.Water as used may be hot water and said water is preferably added as one mass at one moment.The pozzolanic material obtained from the process of the invention is suitable as cement substitute, as material for manufacturing building articles and a binder for occluding one or more fillers to be introduced into a chemical process or one or more fillers presenting noxious properties.

Abstract: A refractory binder including a tackifying agent. The tackifying agent is a montmorillonite clay. The binder is a chromium alumina phosphate mixture with a fluxing agent. The binder may also be a colloidal suspension of alumina, silica or zirconia with montmorillonite clay. The binder is used with refractory fiber to produce a monolithic layer.

Abstract: An optical glass which is a P.sub.2 O.sub.5 system glass including ingredients selected from two groups of R.sub.2 O.sub.3 ingredients of specific contents have excellent resistivity to devitrification, homogeneity, light transmissivity and chemical durability.

Abstract: Disclosed is a novel, magnetic sealant comprising a styrene blocked copolymer, a solubilizing agent, magnetic particles and a blowing agent which will, upon exposure to temperature, will cause the sealant to melt and be drawn toward the magnetically attractive substrate and will also foam, thereby increasing in dimension to fill irregular gap.

Abstract: A process for preparing a zirconia-alumina base composite ultra-fine powder is described, including the steps of: mixing an aluminum salt or an alumina hydrate with an aqueous zirconium oxychloride solution, with or without metal salt acting as a stabilizer; mixing urea or a substance capable of generating ammonia by hydrolysis with the resulting mixture; and allowing the mixture to react at a temperature of 140.degree. to 300.degree. C. and a pressure of 4 to 150 kg/cm.sup.2 in a high-temperature and -pressure vessel. The reaction product is further dried, calcined and crushed to obtain an ultra-fine powder.

Abstract: A cement slurry of low specific density for cementation of oil-and gas wells is produced by mixing oil-well cement with finely divided emission products comprising amorphous silica dust which has been obtained during the electrothermal preparation of ferrosilicon and/or silicon metal, water, and any desirable dispersion components, the emission products being added in an amount in the range of 1-50% of the total weight of dry material. The emission products can either be mixed with the cement while both components are in the dry state whereupon there is added a sufficient quantity of water in order to obtain a desired specific weight of the slurry or first mixed with water and any other desired dispersion components and this slurry is mixed with the oil-well cement.