摘要:
A stone work simulation system including panels formed from a cementitious material. The panels of the system can be cast or injection molded from cementitious slurry, including hydraulic cement, or gypsum cement and an optional latex/water mixture. A desired amount of the slurry is added to the mold, the surface of which includes several spaced apart depressions formed therein to closely resemble a pattern of stones at least partially disposed in a mortar matrix. Optionally, the mold can include a number of flat spaces formed between the depressions. Optionally, a reinforcing mesh is also provided in the mold. A colorant can be disposed on the bottom mold surface prior to the introduction of the mesh and the slurry to impart a color pattern to the system. After sufficient curing, the panel is removed from the mold and is ready for immediate use and/or further processing, such as additional surface coloring. In use, the system can be mounted to a building surface, such as a wall, e.g., with a mechanical fastener, adhesive, mortar, cement, and/or the like. To provide distinctiveness to the system, a plurality of individual simulated stones (e.g., that have been formed separately or as a separable unit, e.g., according to the process above) that are sized, shaped, and colored similarly to or differently from the system, can be incorporated onto the flat spaces formed on the system to form a unique finished product and avoid the appearance of the installed system being an arrangement of individual panel units.
摘要:
A cover composition that can be applied to a bulk material pile, such as landfill refuse, to protect the pile from wind, precipitation, and access by animals and insects is provided. The cover composition is a mixture of a liquid, typically, water; bentonite clay; and synthetic fibers. The composition may be enhanced by the addition of one or more of the following additives: Portland cement, pregelatinized wheat starch, synthetic polymers, soda ash, and latex paint. Unlike prior art cover compositions, the disclosed composition adheres well to waste material, most notably plastics, whereby the composition is easy to apply and provides a substantially uniform, durable protective cover to landfill refuse piles and other bulk materials. Methods of applying the composition to bulk material piles are also disclosed.
摘要:
A cover composition that can be applied to a bulk material pile, such as landfill refuse, to protect the pile from wind, precipitation, and access by animals and insects is provided. The cover composition is a mixture of a liquid, typically, water; bentonite clay; and synthetic fibers. The composition may be enhanced by the addition of one or more of the following additives: Portland cement, pregelatinized wheat starch, synthetic polymers, soda ash, and latex paint. Unlike prior art cover compositions, the disclosed composition adheres well to waste material, most notably plastics, whereby the composition is easy to apply and provides a substantially uniform, durable protective cover to landfill refuse piles and other bulk materials. Methods of applying the composition to bulk material piles are also disclosed.
摘要:
An adaptive cementitious composite composition, comprising: a coarse particulate material such as sand or proppant; a series of other particulate or fibrous materials; and a carrier fluid; the sand and other particulate materials being present as a series of coarse, medium and fine particle sizes in ratios selected to provide an optimised packing volume fraction; wherein the sand or proppant is coated with a resin and at least one of the other particulate or fibrous materials is a material that can be modified when placed at a downhole location.
摘要:
The invention relates to construction materials, in particular concrete, which contain polyester fibers. The polyester fibers are treated with an oligoester to improve their incorporation into the construction materials.
摘要:
Disclosed is a method and apparatus for spray application of a monolithic refractory material, designed to add water to a powder material and knead the powder material during feeding. In the method and apparatus, a primary water injector 7 is arranged in a feed hose 5 extending from a spray-material supply device 1 to a distal spray nozzle 4, and a secondary water injector 8 is arranged in the feed hose at a position just before the distal spray nozzle 4. The primary water injector 7 is arranged on an upstream side of the secondary water injector 8 with a given distance therebetween. 10 to 50 mass %, preferably 15 to 40 mass %, of application water on the basis of the total application water required for the spray application is added from the primary water injector together with compression air in the form of water particles having an average particle size of 100 μm or less, to evenly wet a spray material during feeding to the extent capable of preventing the spray material from being slurried. Then, the remaining application water is injected from the secondary water injector together with compression air. The spray application method and apparatus of the present invention can achieve a high kneading effect by a low amount of application water while improving operational efficiency.
摘要:
Improved methods for the production of lightweight, rigid, insulative perlite/cement solid articles such as bricks (62) are provided wherein expanded perlite is first treated with a cement binder followed by application of cement with subsequent mixing and forming. In preferred forms, a continuous belt (12) is provided with laterally spaced apart stations (22-28) for application of perlite, binder, water and Portland cement, respectively, onto the belt (12); these materials are then mixed in a drum mixer (38) to produce a mixture (61) which is poured into a frame assembly (44) for final curing/hardening.
摘要:
A lightweight ready-mix concrete composition that contains 8-20 volume percent cement, 11-50 volume percent sand, 10-31 volume percent prepuff particles, 9-40 volume percent coarse aggregate, and 10-22 volume percent water, where the sum of components used does not exceed 100 volume percent. The prepuff particles have an average particle diameter of from 0.2 mm to 8 mm, a bulk density of from 0.02 g/cc to 0.64 g/cc, an aspect ratio of from 1 to 3. The slump value of the composition measured according to ASTM C 143 is from 2 to 8 inches. After the lightweight ready-mix concrete composition is set for 28 days, it has a compressive strength of at least 1400 psi as tested according to ASTM C39.
摘要:
A lightweight cementitious composition containing from 10 to 90 volume percent of a cement composition, from 10 to 90 volume percent of particles having an average particle diameter of from 0.2 mm to 8 mm, a bulk density of from 0.03 g/cc to 0.64 g/cc, an aspect ratio of from 1 to 3, and from 10 to 50 volume percent of sand and/or other fine aggregate, where at least a portion of the sand and/or fine aggregate has a fineness modulus of less than 2; where the sum of components used does not exceed 100 volume percent, and where after the lightweight cementitious composition is set it has a compressive strength of at least 1700 psi as tested according to ASTM C39 after seven days. The cementitious composition can be used to make concrete masonry units, construction panels, road beds and other articles.
摘要:
Purposeful addition of crack-initiating voids in the form of low tensile strength particulates, particulates having low matrix interaction, or gas bubbles formed by chemical reaction, in a size range of 0.5 mm to about 5 mm, and preferably of a size commensurate with or larger than naturally occurring crack-initiating gaseous voids, to fiber-reinforced strain hardening cementitious composites generates controlled and uniform cracking which increases strain hardening behavior in conventionally dense cementitious compositions.