|7160384||Amine-containing cement processing additives|
An exemplary method of the invention comprises introducing into a grinding mill, wherein cement clinker is ground to provide cement powder, a diamine such as tetrahydroxylethylethylene diamine, and an alkanolamine such as triethanolamine or triisopropanolamine. The ...
|6695901||Gypsum casting composition and method of casting|
I provide a multi-part aqueous gypsum dental casting composition having gypsum and water and wherein (a) one or more of a first compound is mixed in the gypsum and/or water; or (b) one or more of the first compound and one or more of a second compound are...
|6616753||Methods and compositions for sealing subterranean zones|
Methods and compositions for sealing subterranean zones penetrated by well bores are provided. The methods basically comprise the steps of introducing a sealing composition into the subterranean zone comprised of a hydraulic cement, sufficient water to fo...
|6352585||Gypsum casting composition and method of casting|
A multipart gypsum casting composition comprising a gypsum composition and a water composition where either the water and/or the gypsum composition contains at least two acids selected from the group consisting of oxalic acid, boric acid, phosphoric acid,...
|5879446||Gypsum wallboard, and method of making same|
A method of preparation of gypsum wallboard, as well as a core composition suitable for use therein, are disclosed. The core composition includes a slurry of calcium sulfate hemihydrate (stucco), water, and calcium aluminum lignosulfonate and/or aluminum ...
A cement composition consists essentially of (a) from 50% to 97% by weight (calculated on the total composition) of a Portland cement clinker, the sulfur content of which is from 0.5% to 10% by weight expressed as SO3 and the fluorine content o...
|5158835||Acid rain neutralizing block, method of making such blocks and method of neutralizing acidified surface water|
Blocks, weighing about 35 lbs., formed of a homogeneous mixture of about 75% gypsum and 25% lime, are strategically placed in surface water that is being damaged by acid rain, where, by timed release of lime, the pH of the water is maintained at about 6.5...
|4565579||Nonexplosive chemical composition for gently breaking rock or concrete mass|
A nonexplosive chemical composition for gently and noiselessly breaking a rock or concrete mass. The composition comprises a principal component which is prepared by calcining a starting mixture comprising 100 parts by weight of quick lime and 1-20 parts ...
|4526619||Gypsum composition for denture investment|
A gypsum composition for denture investment consists of 100 parts by weight of a mixture of 50-90 parts by weight of -Gypsum hemihydrate (-CaSO4.1/2H2 O) with 10-50 parts by weight of ଲ-Gypsum hemihydrate (ଲ...
|4205998||Admixture for obtaining rapid hardening portland cement and a method by which it is to be performed|
Composition for obtaining rapidly hardening portland cement containing caum sulfate and calcium oxide wherein active di-aluminium trioxide is included in the form of di-aluminium pentahydroxychloride having the weight ratio of Al2 O3
|4134773||Method of accelerated hardening and strength-increasing of different cements|
A method for accelerating the hardening and increasing the strength of cets, including cement pastes, cement-sand mortars and concretes, which comprises mixing the cements with water plus an admixture at a temperature up to 60° C., and thereafter allowi...
|4126599||Water-resistant shaped structure of gypsum and process for production thereof|
A water-resistant shaped structure of gypsum comprising (A) calcium sulfate dihydrate formed by hardening of calcium sulfate capable of hydration reaction, (B) a calcium type filler for filling up spaces among crystalline particles of said calcium sulfate...