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4427 results about "Construction aggregate" patented technology

Construction aggregate, or simply "aggregate", is a broad category of coarse to medium grained particulate material used in construction, including sand, gravel, crushed stone, slag, recycled concrete and geosynthetic aggregates. Aggregates are the most mined materials in the world. Aggregates are a component of composite materials such as concrete and asphalt concrete; the aggregate serves as reinforcement to add strength to the overall composite material. Due to the relatively high hydraulic conductivity value as compared to most soils, aggregates are widely used in drainage applications such as foundation and French drains, septic drain fields, retaining wall drains, and roadside edge drains. Aggregates are also used as base material under foundations, roads, and railroads. In other words, aggregates are used as a stable foundation or road/rail base with predictable, uniform properties (e.g. to help prevent differential settling under the road or building), or as a low-cost extender that binds with more expensive cement or asphalt to form concrete.

Water permeable brick and preparation method thereof

The invention discloses a water permeable brick and a preparation method thereof. The water permeable brick comprises two parts, namely a surface layer and a base layer, wherein the material of the surface layer is prepared from the following components in percentage by mass: 60-70% of ceramic sand, 15-20% of sand and 15-20% of cement, and in addition to the solid components with the sum of 100% in percentage by mass, water accounting for 50-60% by mass of cement is further added; and the material of the base layer is prepared from the following components in percentage by mass: 45-65% of building silt unburned ceramsite, 10-15% of cement, 5-10% of fly ash, 10-15% of melon seed-shaped drug slices and 10-15% of sand, and in addition to the solid components with the sum of 100% in percentage by mass, the water accounting for 30-40% and a water reducer accounting for 1-1.5% relative to total mass of the cement and the fly ash are further added. The water permeable brick disclosed by the invention is prepared by using the building silt unburned ceramsite to replace natural aggregate or calcined ceramsite, on one hand, the using ways of the building silt unburned ceramsite can be expanded, the utilization rate of solid wastes is improved, and negative effects on an environment are reduced, and on the other hand, the obtained water permeable brick has excellent performance.

Crack self-remediation regenerated concrete based on urease production microorganism mineralization deposition and preparation method

ActiveCN106699026AStrong adaptability to high alkaline environmentAdaptableOn/in inorganic carrierWater reducerMechanical property
The invention discloses crack self-remediation regenerated concrete based on urease production microorganism mineralization deposition and a preparation method. The crack self-remediation regenerated concrete comprises components, namely, expanded perlite carried with urease production microorganisms, cement, stone, sand, silica fume, water, urea, calcium chloride, a urease production microorganism suspension and a water reducing agent. The urease production microorganisms are adopted as a concrete crack remediation agent, urease can be generated through metabolism through the urease production microorganisms, and the urea can be decomposed into NH4<+> and CO3<2+>, and furthermore the calcium carbonate can be mineralized and deposited to remedy cracks. In the preparation process, a part of the crack remediation agent is directly mixed with the concrete, then cracks and holes in regenerated crude aggregate self and weak adhesion areas between regenerated aggregate and a new cement stone base can be remedied, and thus the mechanical property of the regenerated concrete can be improved; meanwhile, the other part of the crack remediation agent is firstly adsorbed into an expanded perlite carrier and is further mixed into the concrete, then the crack self-remediation property of the regenerated concrete in the service period can be improved, and thus the anti-penetrability performance and the durability of the regenerated concrete can be improved.

NSAID formulations, based on highly adaptable aggregates, for improved transport through barriers and topical drug delivery

The invention describes novel formulations of nonsteroidal anti-inflammatory drugs (NSAIDs) based on complex aggregates with at least three amphipatic components suspended in a suitable, e.g. pharmaceutically acceptable, polar liquid medium. A suitably ionised NSAID is one of the two, amongst said three, components that tends to destabilise lipid membranes, the other system component with such activity being typically a surfactant. In contrast, the remaining amongst said at least three amphipatic components typically forms a stable lipid membrane on it's own. An essential characteristics of the resulting, relatively large, aggregates is an improved ability to penetrate pores, in a semi-permeable barrier, at least 30%, and often much smaller than the average diameter of the complex aggregate. This enables said aggregates to mediate NSAID transport through semi-permeable barriers including mammalian skin. As a result of the skin penetration by NSAID loaded large aggregates, the drug delivered transcutaneously with such carriers gets deeper into the tissue than the corresponding NSAID from a solution on the skin surface. This is believed to be due to the special ability of suitable large carriers to bypass the local sink of blood capillaries at the epidermal-dermal junction in the skin. The carrier-mediated delivery of locally applied NSAIDs thus allows therapy of deep tissues under the drug administration site, which is medically highly desirable.

Permeable recycled aggregate and ceramsite concrete doped with industrial and agricultural solid waste and preparation

The invention discloses permeable recycled aggregate and ceramsite concrete doped with industrial and agricultural solid waste and preparation. The permeable recycled aggregate and ceramsite concrete doped with industrial and agricultural solid waste is characterized in that recycled coarse aggregates and ceramsites are taken as coarse aggregates of concrete, an appropriate amount of pretreated industrial and agricultural solid waste such as industrial waste, agricultural waste, household garbage and the like is taken as an admixture, a cementing agent is prepared from cement, water, a superplasticizer and a reinforcement material, and the materials are mixed with a preset stirring process and preparation method, so that ecological concrete with good mechanical property, permeable property and durability is produced. According to the concrete, the waste utilization rate is up to about 80%, the concrete is environment-friendly, locally available materials can be used, the economic benefit is remarkable, ceramist pore is smaller, and sewage can be continuously and stably treated, so that the concrete is commonly used in water environment comprehensive improvement engineering; and besides, the concrete has light weight, high strength and good water permeability and can be also used in permeable pavement engineering such as a sidewalk, a parking lot and the like as well as plant engineering such as ecological riverway slope protection, roof landscape planting and the like.

Self-suspended propping agent and preparation method thereof

The invention belongs to the field of fluid mineral product exploration such as petroleum, natural gas and shale gas, and provides a self-suspended propping agent which is prepared by wrapping or partially wrapping a granular framework with a water-soluble high polymer material; the framework consists of solid granules which are sufficient in mechanical strength for bearing crack closing stress and are selected from one or multiple of quartz sand, ceramsite, metal granules, spherical glass granules, sintered monohydrallite, sintered alumina, sintered zirconium oxide, synthetic resin, precoated sand and crushed fruit shell granules; the amount of the water-soluble high polymer material accounts for 0.1-5wt% of that of the framework. The self-suspended propping agent provided by the invention does not need to be fractured by using fracturing fluid which is added with organic macromolecules and is high in cost, and can be fractured by using natural water which can be obtained at any place directly, so that pollution is reduced, and the cost can be lowered. By adopting the self-suspended propping agent provided by the invention, friction resistance of the fracturing fluid can be reduced, and a fracturing support system adopting the self-suspended propping agent has properties which are generally identical to those of conventional fracturing fluid, and is easy to convey and discharge backwards.

Refractory spray coating with high steel fiber content and spraying method thereof

The invention discloses a refractory spray coating with high steel fiber content and a spraying method thereof, which belong to the technical field of refractory materials. The method comprises the following step of: 1, pneumatically conveying the refractory spray coating to a nozzle, adding water onto the nozzle, and spraying and bonding the coating on a wall; or 2, adding water or a liquid bonding agent into the refractory spray coating, stirring the mixture into mortar, conveying the mortar to the nozzle by a pumping method, spraying the mortar out of the nozzle by using high-pressure air,and bonding the mortar on the wall. The refractory spray coating comprises the following ingredients in part by weight: 30 to 80 parts of refractory aggregate, 30 to 50 parts of refractory powder, 5 to 20 parts of bonding agent, 0.5 to 15 parts of additive and 3 to 80 parts of steel fiber. The invention has the advantages that: by spraying the refractory spray coating on a blast furnace cooling wall, spraying on a blast furnace throat steel brick, spraying on various refractory linings with cold faces and hot faces and repairing, the service life of the refractory material for the inner wall of a blast furnace can be greatly prolonged, and the effects of protecting the environment, saving energy and reducing consumption are achieved.

Regenerative concrete composite material and method for making same

The present invention discloses a regenerated concrete compound material, which is made of the following components according to weight ratio: 37-53 percent of regenerated aggregate prepared by the building waste residue, 14-30 percent of regenerated fine aggregate prepared by the building waste residue, 6-14 percent of industrial waste sand, 14-18 percent of common cement, 6-8 percent of water, additive and glue powder of waste tyre. The preparation method for the regenerated concrete is that: (1) the waste tyre is crushed and then is dipped in the coupling agent solution, and is to be dried; (2) the building waste residue is crushed, screened to obtain the regenerated coarse or fine aggregate; (3) the additive is added into the aggregate and the waste sand for mixing and blending evenly; (4) the regenerated aggregate, waste sand, cement, water and glue powder are milled evenly and then the regenerated concrete compound material can be obtained. The present invention can solve the problems that the building waste residue is difficult to be treated and the entironment is polluted and deteriorated greatly and so on. The building waste residue is to be used for replacing the natural aggregate that can decrease the consumptions to the natural aggregate in the building industry, solve the problems that the natural aggregates are increasingly lacked and the entironment is damaged by the exploitation of the sand stone. The present invention can protect the living environment for the human, guarantee the sustainable development for the society and accord to the requirement of the sustainable development.

Electromagnetic shielding concrete and preparation method thereof

The invention relates to an electromagnetic shielding concrete and a preparation method thereof. The electromagnetic shielding concrete is characterized by comprising gelled material, aggregate, fiber, water reducing agent and water, wherein the gelled material is formed by cement and inorganic mineral admixture, and the inorganic mineral admixture is formed by siliceous dust and at least one of coal ash and ground slag; the aggregate is formed by coarse aggregate and fine aggregate, the coarse aggregate is common cobblestones with the particle size of 5-20mm; the fine aggregate is formed by sand, steel grit and graphite powder; the fiber is formed by steel fiber and carbon fiber; the proportion of the components is as follows: water 175-180kg/m3, aggregate 1725-1760kg/m3; the mass percentage of the components in the aggregate is as follows: 35-40 percent of fine aggregate and 60-65 percent of coarse aggregate; the water to binder ratio is 0.32 to 0.34; the volume doping of the steel fiber is 0.8-1.2 percent of the volume of concrete, the mass doping of the carbon fiber is 0.6-0.8 percent of the mass of the gelled material, and the mass doping of the water reducing agent is 0.5-2.0 percent of the mass of the gelled material. The electromagnetic shielding concrete can effectively shield electromagnetic radiation with the frequency of 100MHz-1.5GHz, and can effectively utilize waste, and has low cost and wide application.

Exterior wall composite insulation heat-proof plastering material

The invention relates to compound thermal insulation plastering material for external wall, which consists of a compound cementing material and a lightweight aggregate. The compound cementing material consists of cement, active admixture, lime powder, promoter, surfactant, anti-crack and waterproof agent, water retaining agent, flame retardant, re-dispersible emulsion powder, alkali-resistance fiber and coal flying ash cenosphere; the lightweight aggregate consists of EPS grain and expanded perlite. The invention has the advantages of low density, thermal performance, high strength, good impact resistance, bond strength and low shrinkage. The compound cementing material adopts a plurality of polymeric cementing materials, allows the insulation material to have good bond performance and simultaneously ensures falling and slipping resistance performance. The invention has good water resistance and high softening coefficient. By using cement-based cementing material as main material and organic reinforced material and waterproof component as auxiliary materials, the invention has a hydrophobic rate more than 98 percent and a softening coefficient more than 0.7. The invention can save energy and protect environment. A great deal of industrial waste residue is used in the materials, which can save a great number of energy, realize resource utilization of the waste residue and is in favor of environmental protection.

Preparation method of novel core-shell type cement-based high-strength lightweight aggregate

ActiveCN103496866AConducive to the protection of non-renewable resourcesSimple processSolid waste managementSpecific functionPollution
The invention provides a preparation method of novel core-shell type cement-based high-strength lightweight aggregate. A cement-based composite material (cement and an admixture) is used as a main cementing material of a shell material, a pelletizing process is adopted for surrounding a shell outside a lightweight core material, and the high-strength lightweight aggregate can be successfully prepared after curing is performed for a certain period of time. The prepared light aggregate has the advantages of high specific strength, good grain shape and good heat preservation and heat insulation, and can realize certain specific functions, such as heat storage, sound insulation and wave absorption. A production process of the high-strength light aggregate comprises the steps of mixing powder, uniformly stirring, spraying liquid to form pellets, curing (steam curing and moisturizing) and screening. According to the preparation method, the problems of great production energy consumption, complex process and serious pollution of the aggregate produced by a traditional sintering process or the problems of relatively large packing density, insufficiently high strength and insufficiently high product quality of unburned ceramsite products are solved.

Ceramic imitation cement component, ceramic imitation cement product and preparation method thereof

The invention discloses a ceramic imitation cement, a ceramic imitation cement product and a preparation method thereof. The ceramic imitation cement comprises the following components in percentage by mass: 35 to 50 percent of hydraulic adhesive, 15 to 43 percent of aggregate particles, 8 to 28 percent of filler, 0.5 to 8 percent of polymer, 0.3 to 3 percent of fiber, 0.5 to 1.3 percent of water reducing agent, 0.2 to 1.3 percent of additive and the balance of water. The ceramic imitation cement product of the invention has the characteristics of high intensity, toughness, rigidity, non-inflammability, low water absorption rate, high resistance to freezing and thawing, antibiotic property, insect resistance, and mould resistance, looks like ceramic but does not need sintering or glazing, has decorating property of an FC plate but does not have the defects of the FC plate and has more functions; and the ceramic imitation cement product can be taken as inner wall and outer wall decorating plates of buildings, floors, outer wall hung plates, wall plates of subway stations and tunnel wall plates. The preparation method has the advantages of simpleness, convenience, practicability, small investment, quick response and capability of preparing ceramic imitation cement plates, plain concrete plates, and terrazzo slabs and flexible cement plates of various colors.

Design method for mixing proportion of self-compacting concrete mixture

The present invention belongs to the technical field of concrete construction and particularly relates to a design method for a mixing proportion of a self-compacting concrete mixture. The method comprises the steps of: determining a performance design target; determining mixing strength and a water-binder ratio; determining densest gradation (or a sand rate) of aggregates and void ratios of different packing states; determining the usage amount of binding materials and mixing water; determining the usage amount of the aggregates; determining the usage amount of additives; determining the actual adding amount of the mixing water; and the like. According to the method provided by the present invention, aimed at blindness of material selection during self-compacting concrete mixing proportion design in the prior art, based on a fundamental theory of particulate dense packing and a composition rule of reaching a densest packing state of solid particulate materials with different particulate diameters, a mixing proportion of different materials is determined by an actually measured densest packing state, and relationships are established between the material mixing proportions corresponding to different densest packing states and expected self-compacting performance grades of the mixture, so that the design method used for the mixing proportion of the self-compacting high-performance concrete mixture and based on a use performance as a target is constructed.

Inorganic fireproof heat-insulating material and preparation method thereof

The invention discloses an inorganic fireproof heat-insulating material, which comprises the following components by weight: 0.5-30 parts of reinforced fibers; 40-65 parts of lightweight aggregate; 2-15 parts of bentonite; 12-35 parts of an adhesive; 5-20 parts of an inorganic gel material; 2-10 parts of an interface agent; 0-10 parts of expanded polyphenyl particles; and 200-260 parts of water. Specifically, the expanded polyphenyl particles play a buffering role in a stirring process, so that the lightweight aggregate can avoid breakage. The interface agent can enhance the compatibility of various raw materials and has a foaming effect. The adhesive and the inorganic gel material retain the produced foam. The reinforced fibers endow the material with certain elasticity and good mechanical strength. The preparation method of the material provided in the invention is simple and convenient, and is easy to operate and to realize industrial production. The material disclosed in the invention has the characteristics of high temperature resistance, good heat insulation performance, and small unit weight, not only can be used as a heat insulation sheet material and a heat insulation slurry, and also can be used as a fireproof door core, a fireproof plugging material and other inorganic refractory materials.
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