Abstract: In the making of a mortar or concrete rich in aluminate cement wherein the cement is mixed with water to hydrate and is thereafter permitted to harden, the improvement which comprises adding to the mixture of cement and water an ionic compound containing anions X.sup.n- whereby there are formed mixed crystals of the formula[Ca.sub.2 Al(OH).sub.6 ].sup.- [( m/n)X.sup.n- (1-m) Al(OH).sub.4.sup.- mAl(OH).sub.3 ; aq].sup.-Preferably X is NO.sub.2.sup.-, SO.sub.3.sup.2-, S.sub.2 O.sub.3.sup.2-, Fe(CN).sub.6.sup.3-, PO.sub.4.sup.3-, FE(CN).sub.6.sup.4-, MnO.sub.4 --, ClO.sub.3.sup.- or CrO.sub.4.sup.2-. The mixed crystals are new.

Abstract: This invention relates to an improved oil well cement composition and a method of use thereof in wells penetrating subterranean formations.My U.S. Pat. No. 3,849,317, issued Nov. 19, 1974, is directed to the hydrolyzed cereal solids as an additive for the reduction of gel strength and yield point of an aqueous drilling fluid saturated with calcium hydroxide in the liquid phase.

Abstract: Process for stabilizing cement stone, formed with binders rich in aluminates by setting with water, against high elevated temperatures and high humidity which comprises adding calcium sulfite to the aluminous binder material prior to setting. In another embodiment of the invention the addition of calcium borate along with the calcium sulfite provided even greater stability both initially and over a period of time. Calcium sulfite formed as a by-product of the waste gas purification of furnaces is the main source of supply for purposes of this invention.

Abstract: A mortar for interior and exterior plastering having anticondensate, antimoisture diffusive, heat insulating and biocidal properties is disclosed.

Abstract: A glass reinforced cement composition containing a scavenger material as an inhibitor to prevent or greatly reduce attack and degradation of the glass reinforcement by the alkali content of the inorganic alkaline cement binder. The scavenger is a finely divided alkali-reactive material which contains silica as the major constituent thereof, and which has a reactivity with the alkali content of the binder substantially greater than the reactivity of the glass reinforcement therewith whereby the alkali content of the binder reacts with the scavenger in preference to reacting with the glass reinforcement.

Abstract: In a building material comprising an inorganic binder selected from the group consisting of Portland cement, alumina cement, calcium silicate, lime and gypsum, structurally reinforced with glass fibers, the improvement which comprises employing as said glass fibers alkali-resistant calcium silicate glass fibers consisting essentially of approximately______________________________________ CaO 26 - 50 % by weight SiO.sub.2 40 - 65 Al.sub.2 O.sub.3 1 - 8 ZnO+ZrO.sub.2 +Cr.sub.2 O.sub.3 0.1 - 10 Fe.sub.2 O.sub.3 and Na.sub.2 O < 2.

Abstract: A hydraulic cement mix including hydraulic cement, aggregate, sufficient water to effect hydraulic setting of the cement, and an additive comprising at least one acetic acid ester of glycerin, wherein the additive is present in an amount sufficient to increase the strength of the mix when hardened. The additive is preferably selected from the group comprising monoacetin, diacetin, triacetin, and mixtures thereof and is present generally in an amount of up to 2.0% by weight based upon the weight of the cement, usually between 0.01% and 2.0% by weight.

Abstract: The proposed weld backing is prepared from a melting stock comprising 70-85 wt.% of carbon filler, 7-15 wt.% of carbon-containing binder, and 7-15 wt.% of carbide-forming component. The backing prepared from said melting stock is characterized by improved operational performances and longer service life.

Abstract: There is provided a composition of matter comprising a cellular aggregate distributed in a hardenable or hardened binder or matrix material, in which the aggregate consists of or includes (i) a fraction of cellular glass beads of mesh sizes up to 3 mm, individually containing one or more interior cells with a maximum cross-sectional dimension at least 0.3 times the mesh size of the bead and having a non-cellular or micro-cellular surface skin, and (ii) a fraction of cellular glass beads of mesh sizes above 3 mm, individually having a multicellular core with a cell population per unit volume substantially higher than the population of said interior cells in said fine fraction beads and likewise having a non-cellular or micro-cellular surface skin.

Abstract: A process for preparing a foamed body comprising a step of mixing the four components of:A. an aqueous solution having a pH of up to 2.0 and containing at least one of acids and water-soluble acidic phosphates,B. at least one of cement materials and anhydrous alkali metal silicates,C. a metal blowing agent, andD. a foaming stabilizerTo obtain a pasty mixture, the acids having an electric dissociation constant (pKa) of up to 4.0 at 25.degree. C, the foaming stabilizer being at least one member selected from the group consisting of activated carbon, zeolite, silica gel, carbon black, talc and mica.

Abstract: Magnesium oxide cements are formulated to contain microfiber fillers multidirectionally oriented throughout. Secondary reinforcing fillers may also be incorporated into these inorganic cements. The use of the microfiber fillers significantly increases the modulus of rupture and tensile and impact strengths of the magnesium oxide cements thus making them available for a wide range of uses including many now presently served by reinforced synthetic organic resins.

Abstract: An improved hydraulic cement composition having an almost constant air content, which is incorporated with an organic phosphoric acid ester of the formula ##STR1## Wherein R.sub.1 is a group of the formula: R.sub.4 --O--(CH.sub.2 CH.sub.2 O).sub.n -- wherein R.sub.4 is an alkyl having 4 to 18 carbon atoms, an alkenyl having 4 to 18 carbon atoms or an aryl substituted with an alkyl having 4 to 18 carbon atoms and n means an average addition molar number of ethylene oxide and is an integer of 0 to 15 in average, and R.sub.2 and R.sub.3 are the same or different and are each hydroxy or a group of the formula: R.sub.4 --O--(CH.sub.2 CH.sub.2 O).sub.n -- wherein R.sub.4 and n are as defined above, or a salt thereof with an inorganic or organic base, as an air entraining agent, optionally together with a dispersing agent and an accelerator.

Abstract: A cement and process of producing the cement is disclosed wherein the cement comprises at least two clinkers, one being a Portland cement clinker of conventional composition and at least one other clinker of low-calcium content or marl clinker. This marl clinker is heated between 450.degree. C and 1250.degree. C and contains hydratizable mineral phases of low-calcium content and 0-30% by weight related to the marl clinker of glass phases.

Abstract: A method for working quick hardening cements comprising preparing (A) a composition comprising a cement paste, mortar or concrete and (B) a composition comprising a powder or suspension composition of calcium aluminate and inorganic sulfate, mixing the composition (A) and the composition (B) and quickly executing the mixture immediately after the admixture.

Abstract: There are provided dry-set cement mortars comprising hydraulic cement and water soluble, high molecular weight polymers and metal salts capable of forming gelatinous or hydrated hydroxides in the presence of aqueous base. These metal salts may be the salts of aluminum, the transition element metals, and the mixed salts of alkali metals or ammonium with certain trivalent metallic cations together with the appropriate anions. The novel sag resistant compositions allow for the replacement of asbestos fibers which are used to impart sag resistance in state-of-the-art dry-set Portland cement mortars.

Abstract: A method of producing freeze-thaw resistant cementitious porous materials, such as concrete, mortar, stucco, in which up to about 30% by weight of the cement of a porous particulate material is mixed into the material. The particulate material may be finely divided fired clay, brick, diatomaceous earth or other mineral particles having a size range of 20-50 Tyler mesh, a total porosity of at least 30% and a pore size in the range 0.05 to 3.0 microns.

Abstract: A hydrated mineral charge is manufactured by grinding a composition selected from the group consisting of calcium aluminates, aluminous cements, and Portland cements, to a powder having an average fineness of from about 3,000 to about 5,000 square centimeters per gram (Blaine's specific surface), hydrating the composition with water to form a paste at a temperature from about 10.degree. C to about 100.degree. C, and adding a sufficient quantity of a liquefying surface active agent to the paste so that its viscosity is less than about 5,000 cps, and so that the paste has a solid content from about 60 percent to about 80 percent by weight.

Abstract: A particulate mixture of .beta.-silicon carbide, boron carbide and a carbonaceous additive is formed into a green body and sintered producing a sintered body with a density of at least about 85% containing boron carbide in an amount ranging from about 10% to about 30% by weight of the total amount of silicon carbide and boron carbide present.

Abstract: Waste matter is incinerated in a combustion zone external to a rotary cement kiln. The resulting gaseous product is taken up in effluent gas from the cement making process in contact with calcareous material. At least some of the combustion zone bottom ash is combined in the eventual standard Portland cement by firing it in the kiln with the clinker-forming materials. The combustion zone can for instance be a fluidized bed combustor. The combustion zone can be a zone through which the clinker-forming materials pass at a temperature such that the waste matter ignites.

Abstract: A method of utilizing waste heat from a fuel-fired electrical power generation or steam raising plant, wherein flue gas from said plant is conducted through a heat exchange zone in contact with relatively cool wet material for making Portland cement.