摘要:
Method for working wood paste, including: a mixture composed of the conventional mix of flour, white cement, wood sawdust, vinyl glue and hot water, possibly treated in order to obtain an effect similar to the most common stone materials; additives of the mixture constituted by powder pigments or liquid pigments, by dried wood paste chips and possibly by stucco for wood of various colors; a mold constituted by a rigid support adapted to house a layer of wood paste until drying has occurred; the method including: A) mixing the ingredients of a monochromatic mixture are mixed, with the additives in correct order and proportions; B) laying out of the mixture on the suitable molds until completely dry; C) working, including cutting and/or sculpting and inlay, to obtain the desired surface finish; D) polishing, by spreading transparent gloss varnish over the surface or conventional techniques are employed for polishing the wood.
摘要:
Provided is a building material that is lightweight, exhibits excellent formability, and is inhibited from being damaged during transportation, and a method for producing the same. Specifically, provided is a method for producing a building material, including: a first step of curing a core layer material including a hydraulic material, a silica-containing material, and an aluminum powder, to react the aluminum powder and form bubbles, and incompletely hardening the hydraulic material and the silica-containing material, to form a foamed core layer; a second step of dispersing a surface layer material including a hydraulic material, and a silica-containing material, to form an unfoamed surface layer; a third step of stacking the foamed core layer on the unfoamed surface layer, to form a stack including the unfoamed surface layer and the foamed core layer; and a fourth step of pressing and curing the stack, and a building material produced therewith.
摘要:
A high temperature lightweight thermal insulating material is formed from a mixture that includes cement or silica sand, water and a foaming agent. The foaming agent can be an aluminum powder or a surfactant. The insulating material has a maximum use temperature greater than about 600 degrees Celsius.
摘要:
A method is disclosed. The method includes providing a cementitious material, the cementitious material including an absorbing material. The method also includes absorbing a fluid into the absorbing material during hydration of the cementitious material. The method further includes retaining the fluid in the absorbing material after hydration of the cementitious material.
摘要:
A method of manufacturing a cementitious composite including: (1) mixing an extrudable cementitious composition by first forming a fibrous mixture comprising fibers, water and a rheology modifying agent and then adding hydraulic cement; (2) extruding the extrudable cementitious composition into a green extrudate, wherein the green extrudate is characterized by being form-stable and retaining substantially a predefined cross-sectional shape; (3) removing a portion of the water by evaporation to reduce density and increase porosity; and (4) heating the green extrudate at a temperature from greater than 65° C. to less than 99° C. is disclosed. Such a process yields a cementitious composite that is suitable for use as a wood substitute. Particularly, by using higher curing temperatures for preparing the cementitious budding products, the building products have a lower bulk density and a higher flexural strength as compared to conventional products. The wood-like building products can be sawed, nailed and screwed like ordinary wood.
摘要:
Cellulose ethers, wherein at least a part of the hydroxyl groups of the cellulose backbone are substituted by methoxy groups and hydroxyalkoxy groups, and optionally alkoxy groups being different from methoxy groups, having an unconventional distribution of methoxy substituents at the 2-, 3- and 6-positions of the anhydroglucose units are described. Such cellulose ethers exhibit significantly higher thermoreversible gel strengths than any known hydroxyalkyl methyl celluloses of comparable viscosity and kind and level of substitution rendering them useful as additives for building compositions such as cement based tile adhesives. In particular, such cellulose ethers can be used to improve the attainable adhesion strength after heat storage conditioning and the temporal setting characteristics of a building composition.
摘要:
A method includes providing a hydraulic composition, wherein a setting time of the hydraulic composition is greater than or equal to 12 hours without triggering the setting of the hydraulic composition and a variation of the slump of the hydraulic composition measured according to the EN 12350-2 Standard, is less than 50 mm or a variation of the spread of the hydraulic composition measured with a cone according to the EN 12350-2 Standard, is less than 100 mm for at least 12 hours without triggering the setting of the hydraulic composition; and storing the hydraulic composition in a closed container; wherein storing of the hydraulic composition occurs for at least 12 hours without mixing, after which the hydraulic composition is useable without further mixing.
摘要:
Fibre cement material, which contains organic fibres, is used as an additional raw material for the production of cement clinker. The cement clinker is produced in a system which comprises a cyclone tower (11) and a rotating drum kiln (15). The cyclone tower (11) comprises cyclones (1-5) and a pre-calciner unit (10) wherein fuel is combusted to feed the cyclone tower with heat. The raw clinker meal is passed through the cyclone tower to preheat it. By the combustion of the fuel in the pre-calciner unit (10) a hot zone is produced in the cyclone tower wherein the raw clinker meal is calcined. In order to be able to add larger amounts of the fibre cement material without causing a too high total organic carbon content of the exhaust gasses and/or without causing depositions of organic matter onto the inner walls of the cyclone tower (11), the organic fibre cement material is added in a dry powdered form in said hot zone, in particular in the pre-calciner unit (10) to be heated in less than 5 seconds to a temperature of at least 800° C.
摘要:
Embodiments of the present disclosure are directed to a low density monolithic fiber cement article that incorporates controlled air entrainment evenly distributed throughout the article to improve various physical properties of the article. In some implementations, air entrainment agents are used to create voids in the article, thereby lowering the density and weight of the boards while maintaining adequate strength. In some implementations, the air entrainment agents can be added in solution to create a foam, or can be used to generate a pre-foam, which can be added to a cementitious paste. The cementitious paste incorporating the air entrainment agent can proceed through an extrusion process, experiencing high pressures, where the voids remain in the final monolithic fiber cement board.
摘要:
Disclosed are cementitious articles with hydrophobic finish. In some embodiments, the article is a waterproof gypsum panel that is surface reinforced with inorganic mineral fibers that face a flexible and hydrophobic cementitious finish possessing beneficial waterproofing properties. The waterproof gypsum panels of the invention are useful in many applications, such as, for example, tilebacker board in wet or dry areas of buildings, exterior weather barrier panel for use as exterior sheathing, and roof cover board having superior water durability and extremely low surface absorption. The flexible and hydrophobic cementitious finish of the invention can include Class C fly ash, film-forming polymer, silane compound (e.g., alkyl alkoxysilane), and otheroptional additives.