Abstract:
The method of processing plasterboards or plasterboard for recover a calcium sulphate source for producing a hydraulic binder, comprises the steps of comminuting plasterboards or a gypsum fraction thereof so as to obtain plasterboard particles and, thereafter, subjecting the plasterboard particles to a heat treatment at an elevated temperature so as to volatilize and/or decompose organic components present in the plasterboard particles.
Abstract:
A cementitious composition useful for water-resistant construction materials, including floor underlayments, backing boards, self-leveling floor materials, road patching materials, fiberboard, fire-proofing sprays, and fire-stopping materials includes about 30 wt.% to about 75 wt.% calcium sulfate beta-hemihydrate, about 10 wt.% to about 40 wt.% Portland3 cement, about 4 wt.% to about 20 wt.% silica fume, and about 1 wt.% to about 40 wt.% pozzolanic filler.
Abstract:
A high permeability metal casting plaster is used for production of high accuracy simulated castings for prototypes and any other plastermold castings. Methods are provided that create the high permeability metal casting plaster and mold. Also, a high permeability metal casting plaster is disclosed that uses control ground and screened alpha-hemihydrate gypsum, control ground and screened beta-hemihydrate gypsum, sucrose for protection against thermal shock, and a foaming agent.
Abstract:
Die vorliegende Erfindung betrifft ein Verfahren zur Herstellung einer mineralischen Zubereitung mittels einer Vertikalmühle, wobei das Verfahren die folgenden Schritte aufweist: a) Zuführen eines ersten Edukts in eine Vertikalmühle,b) Vermahlen des ersten Edukts in der Vertikalmühle zu einem ersten Zwischenprodukt, c) Entnahme des ersten Zwischenprodukts aus der Vertikalmühle, d) Lagerung des ersten Zwischenprodukts in einem ersten Lager, e) Zuführen eines zweiten Edukts und des ersten Zwischenprodukts in die Vertikalmühle, f) Vermahlen des zweiten Edukts und des ersten Zwischenprodukts in der Vertikalmühle zu einem Produkt, g) Entnahme des Produkts aus der Vertikalmühle.
Abstract:
A process for making a fiber reinforced cementitious product such as a panel which hardens to an ultra-high compressive strength composite for use in making panels with ballistic and blast resistant properties. The panel has a continuous phase resulting from curing an aqueous mixture, in the absence of silica flour, of inorganic cement binder, inorganic mineral filler having a particle size of about 150-450 microns, pozzolanic mineral filler, and polycarboxylate based superplasticizer self-leveling agent, and water. The mixture may also include alkanolamine and acid or acid salt. The continuous phase may be reinforced with fiber distributed in the continuous phase before curing to form a panel. The panel may be reinforced with a fiber reinforced skin attached to at least one surface of the core, e.g., by lamination with an adhesive, e.g., epoxy, to form a ballistic and blast resistant cementitious armor panel.
Abstract:
A composition is disclosed for a mixture to be used in conjunction with water for preparing a slurry that hydrates to form a high strength flooring compound. The mixture includes from about 50% to about 98% by weight calcium sulfate hemihydrate, having at least 25% of the calcium sulfate hemihydrate in the beta-calcined form. A polycarboxylate dispersant is included in the mixture in amounts from about 0.2% to about 10% by weight. The mixture also includes 0.05-50% by weight enhancing component. When combined with recommended amounts of water, a slurry is formed that is useful as a flooring composition.
Abstract:
The present invention is of a cementitious composition containing Ordinary Portland Cement (OPC), calcined gypsum, a source of amorphous silica and a source of amorphous alumina. The ratio of calcium sulfate hemihydrate to OPC is 0.7:1.0 to 1.8:1.0, the ratio of amorphous silica and amorphous alumina to OPC is 0.26:1.0 to 0.4:1.0, and the ratio of amorphous alumina to amorphous silica is 0.3:1.0 to 1.5:1.0. The cementitious composition, by itself and mixed with aggregates, is fast-setting and exhibits good early compressive strength and very high compressive strength after hydration. Despite the high content of calcium sulfate relative to prior art OPC formulations, the cementitious composition according to the present invention is essentially waterproof and exhibits excellent strength characteristics, even after 2 years under water. The use of calcined gypsum in place of alumina cement or even OPC is of great economic advantage, and in addition, provides the cementitious composition with quick-setting characteristics. Soluble anhydrite can replace some or all of the calcined gypsum.
Abstract:
The present invention relates to natural-artificial raw materials (aggregates) (1) prepared for use in many sectors such as ship equilibrium weights, elevator weights, x-ray rooms, nuclear power plants, in the field of white goods (washing, dishwashing and oven) And filling the mixed waste formed by mixing with water in the concrete plant (3) into specially prepared steel molds by measuring volumetrically in special volumetric containers, and withdrawing the water with a pressurized and vacuum system in the rotary mold wet casting press unit (4).
Abstract:
La presente invención se refiere a una composición de recubrimiento para diferentes aplicaciones en las artes plásticas y en la industria de la construcción, que engloba a varios tipos de productos ya existentes en el mercado como son: resanadores de muros o madera, recubrimientos, pastas texturizadoras, pegamentos para unicel, mejorando las características de adherencia, maleabilidad, velocidad de secado y alta resistencia a la penetración, así como resistencia al fuego directo, dicha composición se refiere a un material de alta consistencia pastosa elaborado a base de yeso cerámico, cemento blanco, yeso tipo dental y aglutinantes, que le confieren excelentes propiedades de adherencia y alta dureza, diseñado especialmente para aplicaciones en la industria de la construcción, para recubrimientos de defectos en superficies de madera, yeso, concreto o mortero.
Abstract:
La composition cimentaire de chape fluide autonivelante à retrait limité, formée d'un mélange d'un liant cimentaire, d'adjuvant fluidifiant, de granulats et d'eau, est caractérisée en ce que le liant comprend de 70 % à 85 % en poids de ciment Portland, de 7 % à 18 % en poids de clinker sulfoalumineux et de 6 % à 14 % en poids de sulfate de calcium, avec un rapport molaire sulfate de calcium C$/sulfoaluminate de calcium C 4 A 3 $ compris entre 5 et 7 et un rapport pondéral eau/liant entre 0,60 et 0,90. La chape fluide autonivelante ainsi réalisée, présente une résistance mécanique à Sa compression à 24 heures au moins égale à 1 MPa, un retrait à 7 jours, mesuré sous une hygrométrie relative de 50 %, inférieur à 500 μm/m et une valeur de gonflement endogène mesurée à 7 jours inférieure à 1000 μm/m, ainsi qu'un très faible relèvement de bords.