Abstract: A method for preventing shrinkage of alkaline aqueous hydraulic cementitious mixtures during setting and hardening which comprises incorporating in the mixtures a monopersulfate salt, or a monopersulfate salt together with at least one peroxygen compound other than the monopersulfate salt; and hydraulic cement compositions for preparing such alkaline aqueous hydraulic cementitious mixtures. The monopersulfate salt, or monopersulfate salt together with at least one peroxygen compound other than monopersulfate salt, generates sufficient oxygen gas during setting and hardening of the alkaline aqueous hydraulic cementitious mixture to provide controlled expansion of the mixture.

Abstract: Catalyst is produced by first activating a chromium-containing silicon-containing support at calcination temperature, treating with a fluoride compound and thereafter heating at a lower temperature of 300.degree. to 1000.degree.F for about 1 to 20 hours. Catalysts thus produced are of particular utility in the production of narrow molecular weight distribution ethylene polymers.

Abstract: Refractory fibers having a composition of 10-75% Al.sub.2 O.sub.3, 1-30% Cr.sub.2 O.sub.3 and 10-75% metal (IV) oxide selected from at least one of silica, titania, zirconia, and tin oxide and having at least one microcrystalline phase therein may remain strong, flexible, and continuous at temperatures of 1300.degree. to 1500.degree.C and beyond.

Abstract: A steel slag cement manufactured by reducing a steel slag discharged from a steelmaking furnace such as a converter, an open-hearth furnace or an electric arc furnace, and then oxidizing the steel slag thus reduced, which consists of, in weight percentage:CaO : 68 to 72%,SiO.sub.2 : 22 to 26%,Al.sub.2 O.sub.3 : 1 to 3%,Fe.sub.2 O.sub.3 : 0.2 to 1.0%,P.sub.2 o.sub.5 : 0.1 to 0.6%,TiO.sub.2 : 0.4 to 0.9%,MnO : trace to 0.4%,MgO : 0.3 to 3.0%,CaF.sub.2 : 0.3 to 2.0%,and the balance incidental impurities.

Abstract: The invention relates to a method of thermal calcination of minerals wherein mineral matter is calcined in a calcination system comprising an optional pretreatment zone and a kiln directly fired by a fuel which must exceed a predetermined calorific value but must not exceed a predetermined ash content, and wherein combustible matter which need not satisfy said calorific value and ash content requirements is burned in separate combustion apparatus external to the calcination system and heat transferred from said separate combustion apparatus to the calcination system in at least one gaseous medium is employed to replace part of said fuel.

Abstract: The present invention is concerned with a composition for metallurgical furnaces.The composition comprises one or more refractory materials and an aromatic substance in which the atomic ratio of carbon to hydrogen is approximately 0.8 or higher. That substance serves as a binder for the refractory material. The composition of the invention is characterized in that the aromatic substance presents an average molecular weight of approximately 1500 or higher and an initial boiling point of approximately 300.degree. C or higher at 760 mm Hg.

Abstract: The method comprises the use of aluminium production wastes in the form of slags obtained from the melting of aluminium alloys and the separation of a fraction of particles of from 0.3 to 1.2 mm in size from the slags as a gas developing agent for cellular concretes.

Abstract: A cement having the following composition, parts by weight:______________________________________ alite 1 to 50 belite 1 to 45 calcium chloroaluminate 30 to 1 highly-basic calcium chlorosilicate 75 to 5 calcium chloro-orthosilicate 55 to 5 calcium chlorcalumoferrite 2 to 22. ______________________________________The cement is made by mixing the following ingredients, in parts by weight, calcareous component (calculated for CaO) 34 to 44, silicaceous component (calculated for SiO.sub.2) 9.5 to 17, aluminous component (calculated for Al.sub.2 O.sub.3) 1.6 to 14, ferrous component (calculated for Fe.sub.2 O.sub.3) 0.8 to 5, calcium chloride (calculated for CaCl.sub.2) 8.0 to 23, firing the mixture at a temperature of 1,000.degree. to 1,200.degree. C., and then at a temperature of 1,200.degree. to 1,400.degree. C. The product is then cooled and ground.

Abstract: A method of preparing a reinforced clay based article is described. A mixture of clay and reinforcement is shaped, dried and then fired at a temperature and for a time sufficient to stabilize the clay against redispersion in water, without forming a ceramic article.

Abstract: A raw mixture for the production of a refractory aluminous cement which consists of a basic component comprising barium carbonate or strontium carbonate, an acidic component comprising alumina or a mixture of alumina with zirconia, and chloride of at least one of the following metals: barium, strontium, sodium or potassium. The mixture according to the present invention makes it possible to reduce energy consumption for the production of cement by 30 to 35%, lower the calcination temperature by 300.degree. to 500.degree. C and to improve the quality of cement.

Abstract: An inorganic cement mixture, capable of being thermally foamed in situ, consists essentially by weight of 8-20% of crystalline hydraulic cement, 22-35% of a hydraulic cement in the form of a glass powder, and 45-70% quaternary ammonium silicate solution. The mixture can be set as a cement and thermally foamed to unite two bodies and serve as a spacer and support to maintain them in spaced relation.

Abstract: A process which comprises treating hazardous waste with an aluminium silicate or aluminosilicate and with a Portland cement in the presence of water to form a slurry and allowing the slurry to set into rock and a crystal matrix having encapsulated therein a hazardous waste and having a permeability of less than 1 .times. 10.sup.-4 cm. sec.sup.-1 and a compressive strength 28 days after preparation of 100 to 1000 psi.

Abstract: The herein-proposed method of producing cement clinker from a chlorine-containing raw mixture, comprising the steps of introducing said mixture into a kiln, sintering of the mixture, removing chlorine-containing compounds from the resultant sinter by acting on the sinter with a steam-gas-and-air mixture, subsequently regenerating the chlorine-containing compounds and cooling the resultant clinker, is characterized by the fact that the sinter is suspended in the steam-gas-and-air mixture, and the regeneration of the chlorine-containing compounds is carried out by spraying the raw mixture in a stream of chlorine-containing flue gases.

Abstract: A raw mixture for the production of cement consisting of calcareous, aluminous, silicaceous, ferrous, magnesium-containing components and calcium chloride; said components being contained in the raw mixture in the following proportions, per cent by weight:______________________________________ calcareous component (calculated for CaO) 30 to 42.3 silicaceous component (calculated for SiO.sub.2) 12.5 to 17.5 aluminous component (calculated for Al.sub.2 O.sub.3) 1.6 to 12.4 ferrous component (calculated for Fe.sub.2 O.sub.3) 0.6 to 4.4 magnesium-containing component (calculated for MgO) 1.5 to 8 calcium chloride 6 to 20 losses at calcination the balance. ______________________________________The above composition makes it possible to perform calcination of the raw mixture at substantially lower temperatures (within the range of from 1,000.degree. to 1,100.degree. C) and to obtain cement possessing a higher activity.

Abstract: A cement mix suitable for mixing with water to form a glass reinforced cementitious material for use in high tensile strength applications such as surface bonding of concrete blocks or the like or in the formation of concrete products and characterized by a resistance to degradation of the glass reinforcement by the alkaline environment of the cementitious material. The cement mix comprises a dry mixture of an inorganic cementitious binder containing at least one reactive alkali compound, glass reinforcement fibers, and a water soluble salt of a metal selected from the group consisting of barium, lithium, and zinc.

Abstract: A foamed cementitious material comprising portland cement and a film-forming, water-resistant, alkali-stable emulsion polymer and process of preparing said foamed material is described. Also described are laminated cementitious composites of an unfoamed veneer of a mixture of portland cement and a film-forming, water-resistant, alkali-stable emulsion polymer applied at the surface of a layer of the above-described foamed cementitious material, and, optionally, a layer of plywood or metal further applied at the exposed foamed material surface are described. These materials are useful as exterior building covering articles.

Abstract: The heavy metal content of sludge waste is fixed in a cementitious solid product by mixing the waste sludge with fixing ingredients comprising vermiculite and cement.

Abstract: Method of incorporating carbon fibers into an aqueous hardenable hydraulic cementitious matrix to produce a formable composition which can be set to produce a reinforced structure having improved flexural strength, and improved resistance to cracking and spalling, which employs a polyethylene oxide in an amount sufficient to effect separation of the individual fibers of the fiber strands present in the mix and uniformly disperse them throughout the mix.

Abstract: A lute for coke ovens and the like is of clay-like consistency and contains a blowing agent which produces gas at least within the temperature range 160.degree. to 290.degree. C, and can appreciably cut pollution.

Abstract: A high density thermal insulation material is described, consisting essentially of, in parts by weight, 15 to 35 parts of lime, 15 to 35 parts of silica or other siliceous material, 40 to 70 parts of wollastonite, and 1 to 10 parts of organic fiber, and where the wollastonite content is at least 40 percent by weight of the total weight of solids, all slurried in water, then compressed to a shape-retaining body of at least 20 pcf density and indurated to form an asbestos-free, wollastonite-reinforced, crack-resistant tobermorite calcium silicate hydrate matrix thermal insulation.