Provided is a blocking material and a method for manufacturing alloy steel using the same. In maintaining a molten ferro alloy, used when manufacturing a manganese-containing alloy steel, at a temperature of at least a melting point of the ferro alloy, a blocking material layer is formed on the melt surface of the molten ferro alloy by using a blocking material which includes, with respect to the total of 100 wt %, 37-66 wt % of CaO and SiO.sub.2, 8-15 wt % of Al.sub.2O.sub.3, 6-18 wt % of MgO, and 20-30 wt % of MnO, wherein the ratio of CaO to SiO.sub.2 (CaO/SiO.sub.2) is in a range of 0.95-1.2. Thus, nitrogen in the air may be prevented from being mixed into the molten ferro alloy.

An agglomerate abrasive grain includes a mixture of individual abrasive grains and hollow bodies, wherein the abrasive grains and the hollow bodies are held together via a binding matrix of aluminosilicate and alkali silicate, and the agglomerate abrasive grain has an open porosity and a closed porosity in each case ranging from 5% by volume to 40% by volume, wherein the total porosity of the agglomerate abrasive grain is less than 50% by volume.

Portland cement compositions for use in high-temperature, high pressure wells are designed such that the lime-to-silica molar ratio is between 0.5 and 1.0, and the alumina-to-silica molar ratio is between 0.05 and 0.10. After curing and setting at temperatures between 85 C. and 300 C., the cement compositions form tobermorite as an initial and permanent calcium silicate hydrate phase.

The present invention suggests novel inorganic binder formulations and the use of these formulations for the production of acid and heat-resistant construction products.

A composition of matter as well as a protective coating or article manufactured from the composition produced by preparing a non-flammable mixture by mixing (I) at least one water-soluble alkali metal silicate selected from the group consisting of sodium silicate, potassium silicate, and combinations thereof; (II) sodium aluminosilicate, which, in the process of interacting with a soluble alkali metal silicate under heat and/or fire, substantially expands and produces foam, which provides heat/fire protection for surfaces, (III) at least one chemical selected from the group consisting of silica, mica, talc, microspheres, glass, ceramic, chopped fibers, plaster of Paris, sodium bicarbonate, cement, perlite, zinc oxide, zeolite, wollastonite, vermiculate, clay, borax and alumina, which, in the process of interacting with a soluble alkali metal silicate and sodium aluminosilicate, accelerates the processes of interaction and improves the mechanical, physical and thermal properties including providing stability of the mixture.

The present invention comprises a product. The product comprises a first mineral in particulate form and having a first pozzolanic reactivity and a second mineral in particulate form and having a second pozzolanic reactivity greater than the first reactivity, wherein the surface of at least some of the particles of the first mineral is at least partially covered with particles of the second mineral. A method of making the composition of the present invention is also disclosed.

A concrete or mortar composition including (i) a cementitious binder material that contains Portland cement and 1-50 wt % date palm ash relative to the total weight of the cementitious binder material, (ii) a coarse aggregate, (iii) a fine aggregate, and (iv) water, wherein the cementitious binder material is present at 200-500 kg per m.sup.3 of the concrete or mortar composition.

A concrete or mortar composition including (i) a cementitious binder material that contains Portland cement and 1-50 wt % date palm ash relative to the total weight of the cementitious binder material, (ii) a coarse aggregate, (iii) a fine aggregate, and (iv) water, wherein the cementitious binder material is present at 200-500 kg per m.sup.3 of the concrete or mortar composition.

The present invention comprises a product. The product comprises a first mineral in particulate form and having a first pozzolanic reactivity and a second mineral in particulate form and having a second pozzolanic reactivity greater than the first reactivity, wherein the surface of at least some of the particles of the first mineral is at least partially covered with particles of the second mineral. A method of making the composition of the present invention is also disclosed.

An inorganic membrane filtration article and methods for making the same. The membrane filtration article includes a sintered flow-through ceramic honeycomb with a plurality of partition walls defining a plurality of open channels from an inlet end of the honeycomb to an outlet end of the honeycomb. The honeycomb is formed from a cordierite composition with low-sodium and/or low-potassium content for enhanced filtration performance.