563 results about "Cement composites" patented technology

An indirect solid free form scaffold manufacturing technique is provided. More particularly, the present invention provides a set of molds, casting methods, mold removals, and surface modification techniques that are compatible with image-based design methods and with solvent, melt, and slurry casting of polymers and ceramics.

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 building 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.

A cementitious product and method of modifying the properties of a low or medium density FRC product by providing a predetermined pore size distribution. The pore size distribution is obtained such that in critical zones of the distribution, the pore volume is substantially equivalent to or less than the pore volume in a respective critical zone of a conventional high density FRC product. The resultant material provides improved properties over conventional medium density FRC products, in particular improved freeze/thaw durability and/or improved workability.

A cementitious composite article comprising (a) a cementitious core, (b) a skim coat cementitious layer in contact with the cementitious core having a density greater than the cementitious core, and (c) a fibrous mat comprising (i) microfibers and (ii) continuous fibers having a length of about 0.6 cm or more, wherein the fibrous mat comprises an inner surface in contact with the skim coat cementitious layer; as well as a method for manufacturing same.

The invention relates to a fiber reinforced cement composite concrete precast construction member (PC-FRC) and a production method thereof, which are suitable for engineering of building exterior wall decoration, building structure containment, and energy conservation and heat preservation, are particularly suitable for prefabricated housing industrialization projects and are suitable for the fields of people's livelihood such as natural disaster prevention and post-disaster reconstruction. The fiber reinforced cement composite concrete precast construction member comprises a decorative finish layer, a fiber reinforced cement layer, a concrete structure layer, a heat preservation layer and a steel reinforcement framework, wherein the fiber reinforced cement layer is composited on the decorative finish layer and is connected with the concrete structure layer; the heat preservation layer is laid in the concrete structure layer and is completely coated by the concrete structure layer; the steel reinforcement framework is laid in the concrete structure layer; and the fiber reinforced cement layer, the heat preservation layer and the concrete structure layer are composited and molded in molds with models. According to the fiber reinforced cement composite concrete precast construction member, the connecting part of the surface of the precast construction member is provided with exposed steel reinforced bars, and the exposed steel reinforced bars are used for connecting precast pieces with building structures during building assembly; and suspension embedded pieces are laid in the concrete structure layer.

A coated article is provided that includes a cement composite substrate; and a coating system applied to the substrate. The coating system includes an epoxy-functional coating composition applied to the substrate, and a water-based coating composition, distinct from the epoxy-functional coating composition, applied to the epoxy-based coating. between the compositions. A method is also provided that includes the steps of: providing a cement composite substrate; applying an epoxy-functional coating composition to the substrate; and applying a water-based coating composition, distinct from the epoxy-functional coating composition, to the epoxy-based coating. The water-based coating composition used in this method preferably comprises a polymer having one or more functional groups that can react with the epoxy-based coating to promote adhesion between the compositions.

The present invention provides a coating composition, a method of coating a substrate, and a coated substrate (e.g., a coated cement fiberboard article). In preferred embodiments the coating composition includes one or more latex polymers and an aliphatic epoxy resin system. The coating composition can include one or more coating compositions that may be applied in one or more layers. A coated article comprising a cement fiberboard substrate and a coating system applied to the substrate is also provided. The article includes a first coating system applied to the substrate, wherein the first coating system includes an aliphatic epoxy resin system having an aqueous dispersion of polymer particles, optionally a silicate additive, and optionally one or more olefinic compounds and initiator for same. The first coating system preferably includes one or more coating compositions that may be applied in one or more layers. In a preferred embodiment, the first coating system is applied to all the surfaces of the substrate (e.g., the front side, back side and edges of a board). The coated substrate may then be coated with other optional coatings, e.g., decorative or protective topcoats.

The invention relates to a foaming cement composite vacuum heat insulation plate comprising a vacuum heat insulation plate and foaming cement which covers the periphery of the vacuum heat insulation plate. The vacuum heat insulation plate comprises core materials, high strength air resistance film and interface mortar. The high strength air resistance film covers the periphery of the core materials and is encapsulated between core materials through vacuumpumping. A layer of interface mortar covers the periphery of the high strength air resistance film. The thickness of the interface mortar is 2 millimeters to 3 millimeters. The foaming cement composite vacuum heat insulation plate and a preparation method of the foaming cement composite vacuum heat insulation plate have the advantages that problem of damage and air leakage of the vacuum heat insulation plate in a work process is solved, construction and installation are convenient to achieve, heat retaining property, water resisting property, durability and freezing resistance are good, flame class is non-ignitable or fire-retardant and good fireproof performance is achieved.

Process for production of acid and high temperature resistant cement composites, where the matrix is alkali activated F fly ash alone, F Fly ash combined with ground slag or ground slag alone. F-fly ash produces lower quality alkali activated cement systems. On the other hand the lack of calcium oxide results in very high resistance to medium and highly concentrated inorganic or organic acids. The high strength and low permeability of pure F-fly ash cement systems is achieved by using in the composition un-densified silica fume, the amorphous silicone dioxide obtained as by products in production of ferro-silicones. Precipitated nano-particle silica made from soluble silicates and nano-particle silica fume produced by burning silicon tetra chloride in the hydrogen stream.

A coated article which includes a cement fiberboard substrate and a radiation-curable coating system applied to the substrate. The coating system includes a latex polymer, one or more olefinic compounds and water, and may be provided in the form of one or more coating compositions that may be applied in one or more layers, wherein each of the coating compositions is preferably an aqueous composition, or can be mixed with another composition (e.g., on the substrate) to form an aqueous composition.

A coated article which includes a cement fiberboard substrate and a radiation-curable coating system applied to the substrate. The coating system includes an aqueous dispersion of water-dispersible polymer particles, one or more olefinic compounds and water, and may be provided in the form of one or more coating compositions that may be applied in one or more layers, wherein each of the coating compositions is preferably an aqueous composition, or can be mixed with another composition (e.g., on the substrate) to form an aqueous composition.

The present invention provides a composite wall panel with good thermal insulation and sufficient strength for structural use which is designed for the fabrication of energy efficient building. The composite wall panel of the present invention comprises a foamed concrete core with sufficient compressive strength and low thermal conductivity which is sandwiched between two lightweight ductile fiber reinforced cementitious composite (FRCC) protective layers with low thermal conductivity, good barrier resistance to moisture/chloride ion/gas, multiple cracking as well as certain amount of steel reinforcements. These composite wall panels are useful in a variety of buildings in both cold and hot regions.

A cementitious composite product that can function as a substitute for stone and solid surface materials, such as granite, marble, and engineered stone is provided. Furthermore methods for manufacturing the cementitious composite product using an extrudable cementitious composition that can be extruded or otherwise shaped into stone-like building products that can be used as a substitute for many known stone products is disclosed. In one embodiment, the cementitious composite products can be manufactured more cheaply to be as tough or tougher and more durable than stone and solid surface materials.

A fiber cement composite material providing improved rot resistance and durability, the composite material incorporating biocide treated fibrous pulps to resist microorganism attacks. The biocide treated fibers have biocides attached to inner and outer surfaces of individualized fibers to protect the fibers from fungi, bacteria, mold and algae attacks. The biocides selected have strong affinity to cellulose and do not interfere with cement hydration reactions. This invention also discloses the formulation, the method of manufacturing and the final fiber cement products using the biocide treated fibers.

Cementitious composites engineered for self-healing, combining self-controlled tight crack width and extreme tensile ductility. Self-healing takes place automatically at cracked locations without external intervention. In the exemplary embodiment, fiber-reinforced cementitious composites with self-controlled tight crack width less than 50 μm and tensile ductility more than 2% are prepared. Self-healing in terms of mechanical and transport properties recovery of pre-damaged (by pre-cracking) composite is revealed in a variety of environmental exposures, include wetting and drying cycles, water permeation, and chloride submersion.

The present invention relates to a fiber-reinforced cement composite exterior wallboard and the preparation method. In the present invention, 60 to 100 portion of cement are used as the cementing material; 10 to 20 portion of calcium powder and 10 to 30 portion of silica powder are used as the aggregate material; 2 to 10 portion of closed microporous expanded perlite after pretreatment are used as the light aggregate material; 5 to 20 portion of wood fiber, 2.5 to 15 portion of wood powder and 0 to 1.5 portion of polypropylene fiber are used as the reinforcing material; besides, 0.2 to 20 portion of methyl cellulose, 20 to 40 portion of secondary powder coal ash, 0 to 8 portion of pulp and 0 to 6 portion of initial setting agent are added; after mixed in a material mixing machine and kneaded in a kneading machine, the materials are arranged in a mold and then compressed by a flat sulfuration machine to form the exterior wallboard. The exterior wallboard of the present invention uses low-cost materials and material without harmful substances to human bodies such as asbestos and so on; with a simple and fine production process, the prepared products has good performances of heat preservation, heat insulation and sound insulation, and is an energy-saving exterior wallboard. The present invention also solves the problems of wet operation and strong labor intensity in operation of preparing exterior wallboards.

The invention provides a method for reinforcing concrete beam by a prestressed carbon fiber plate and steel-concrete. The method comprises the following main steps of firstly, chiseling off a concrete protecting layer on the bottom surface of the concrete beam, drilling and embedding steel bars, and arranging a layer of a steel bar mesh; secondly, blanking a steel plate, and respectively welding waved toothed plates at an anchoring end and a tensioning end of the steel plate for constraining the carbon fiber plate; thirdly, fixing the steel plate on the steel bar mesh, and taking the reinforcing steel plate as a bottom die to prepare and cast self-compacting concrete; fourthly, applying prestress by adopting a jack, tensioning the carbon fiber plate and anchoring; finally, varnishing cement composite mortar on the surface of the prestressed carbon fiber plate and the waved toothed plates as protecting layers to finish the bending resistance and reinforcing of concrete. According to the reinforcing method provided by the invention, the convenience in construction is realized, and the required equipment is simple; the bending capacity, rigidity and the durability of the existing concrete beam can be remarkably improved, and the service life is prolonged; the reinforcing method is particularly suitable for conditions of concrete spalling, carbonization and other damages at the bottom of the concrete beam.

The invention patent relates to an enhanced cement composite grinding aid, pertaining to a cement additive. The enhanced cement composite grinding aid has the following main ingredients in percentagesby weight: 45 percent to 90 percent of diethanol isopropanolamine, 10 percent to 30 percent of molasses, 5 percent to 20 percent of lignosulphonate, 0 percent to 15 percent of inorganic dispersant and 0 percent to 30 percent of water. The main ingredient of the grinding aid, diethanol isopropanolamine, is a substitute for trolamine and triisopropanolamine in respect of property and the property thereof is superior to single trolamine or triisopropanolamine grinding aid. The application of the enhanced cement composite grinding aid to cement production can effectively increase output per machine hour of a grinder, improve cement strength in early period and later period, and reduce cement production cost.

The present invention discloses a pressed cement composite material, which relates to a cement composite material; the present invention is to solve the shortcoming in the existing pressed cement material that: the sense ability for the force-electricity coupling effect is much lower, the existing method is influenced by the humidity greatly, and the base polarization is easy to influence the test of the electricity signal. The present invention consists of a function component and cement material; the function component is a nickel powder or a mixture between the nickel powder and one or more than one material including carbon cellulose, carbon, graphite and steel residual; the cement material is a glue material or a composite material between the glue material and the bone material; thereinto, the function component occupies between 1 percent and 80 percent in the total weight; and the rested is the cement material. The sense ability of the pressed cement composite material in the present invention is much higher; the sensitivity can reach to more than hundred or thousand, which is higher than the sensitivity of the existing pressed cement composite material with the function component including carbon cellulose, carbon and steel residual and so on. Besides, the force-electricity coupling effect for the material is much smaller by the humidity; the test of the electricity signal is not easy to be influenced by the base polarization.

The invention relates to a three-dimensional fiber inorganic composite (FCC: Fiber Cement Composite) product and a production method thereof, and the three-dimensional fiber inorganic composite product comprises a decorative layer and a three-dimensional fiber-reinforced cement structure layer. The decorative layer is prepared from decorative mortar and can be subjected to fiber reinforcement; and the structure layer is prepared from the fiber with high elastic modulus, the fiber with low elastic modulus and reinforced concrete mortar in three-dimensional distribution, and 0-3 layers of reticular reinforcing material is further laid. The decorative layer and the structure layer are compounded in a mold with the decorative effect and can be prepared by adopting an integral formula and process. The product is prepared through the fiber mixing technology and the premixing and forming technology, a high-performance novel material applied to the fields of building decoration engineering, anti-cracking engineering construction, building exterior wall repair and the like is realized, the product has the advantages of light weight, high strength, high durability, anti-cracking property and the like, and fiber-reinforced exterior wall plates, decoration members and other products in complex shapes and fineness can be further manufactured. Simultaneously, as the production process is simple, the degree of mechanized production is high, the production cost is low and the range of market applications is broad.