130results about How to "Stem shrink" patented technology

The invention discloses anti-erosion low calcium portland cement and a preparation method thereof. The anti-erosion low calcium portland cement comprises clinker and gypsum according to a weight ratio of 96.5: 3.5 to 94.5: 5.5. Minerals of the cement comprises, by weight, 35.03-49.51% of C3S, 25.13-39.00% of C2S, 0.21-8.84% of C3A, 8.2-19.2% of C4AF and 1.71-9.24% of MgO. The cement has good anti-erosion performances, can effectively prevent seawater erosion of concrete engineering, has small dry shrinkage and good anti-cracking ability, improves a service life of oceanographic engineering, and has high early strength. Compared with the existing low-heat portland cement, the anti-erosion low calcium portland cement is conducive to shortening of a concrete work form stripping period and processing progress.

The present invention relates to a compact composite light-weight internal and external wall panel. It includes slurry material layer of external layer. Said slurry material layer is made up by using (by weight portion) 100 portions of quick-hardening early-strength sulphoaluminate cement, 0-35 portions of fly-ash, 0-10 portions of building glue and 0.2 portions as raw material through the processes of mixing, adding water and making slurry. It the slurry material layer interior a plastic-coated glass fiber mesh fabric is filled, and the slurry material layer interior is covered with a foamed plastic layer, said foamed plastic layer is a high-foamed polystyrene foam plastic plate. In the foamed plastic layer several through holes are set, in every through hole a column slurry material body is injected, and two sides of said panel body are equipped with tongue and slot mortise.

The invention belongs to the technical field of building materials, and in particular relates to a high-flexibility and low-shrinkage fiber reinforced cement-based composite material. The composite material is prepared by mixing cement, coal ash, silicon powder, gypsum, an expanding agent, a water reducing agent, a shrinkage reducing agent, a defoaming agent, a thickening agent, fine sand, fibers and water, wherein the total mass percentage of the cement, the coal ash, the silicon powder, the gypsum, the expanding agent, the water reducing agent, the shrinkage reducing agent, the defoaming agent, the thickening agent, the fine sand and the fibers is 77-85 percent, and the mass percentage of the water is 15-23 percent. The fiber reinforced cement-based composite material has the performance characteristics of low shrinkage, high flexibility, small crack width, quickness in condensation and early strength and is high in compressive strength and good in synergism with other materials.

The invention relates to a multifunctional anti-leakage shrinkage type concrete surface layer reinforcer which is prepared from the following components in percentage by weight: 10-20 percent of high polymer, 1-7 percent of film forming aided compound, 5-10 percent of surface layer active agent compound, 1-4 percent of leakage aided compound, 1.5-4.5 percent of active compound and the balance of water. The invention has good concrete surface layer enhancement effect, can obviously reduce the shrinkage of surface layer concrete, obviously improves the carbonization resistance and the medium leakage resistance of surface layer concrete, has convenient construction and obvious economic benefit and can be widely applied to the strengthening treatment operations on the surface layers of cement and concrete pouring components, concrete components under corrosion environment conditions such as piers, dams, and the like and deformed concrete components difficult to be strengthened by adopting a conventional method.

This invention relates to a hydropower project used concrete admixture and its applications. The mixture mixed by grinding slag powder and grinding limestone powder, with the ratio of 4:6 to 7:3. Under the project design requirements to adjust the ratio of limestone powder, can gain varying activity of concrete admixture. With 30% to 70% of the amount used, not to increase consumption of concrete and can reduce concrete shrinkage. Iron (Fe-Mn) Slag from steel smelting industrial waste, sources is rich, is conducive to environmental protection; Using this invention, hydropower construction can make full use of the geographical situation to produce admixture, can reduce the long-distance transport of fly ash, economic benefits and reduce the adverse effects of supply and transportation of fly ash.

The dry mixed polymer mortar consists of quartzite 60-65 wt%, cement 20-25 wt%, limestone powder 8-12 wt%, amylase 3-3.5 wt%, thixotropic bentonite lubricant 1-3 wt%, organic silicon compound 1.5-2.0wt%, hydrophobic agent 0.15-0.20 wt%, methyl cellulose 0.20-0.30 wt% and cellulose fiber 0.30-0.60 wt%. It is one kind of green furnishing and decorating material and has the features of light weight, high strength, high adhesion, being fireproof, etc.

The invention discloses straw fiber reinforcement air-entrained concrete which comprises a base material, an aluminum powder paste, a straw fiber, an additive and water, wherein the doping amount of the aluminum powder paste accounts for 0.06%-0.09% of the dry weight of the base material; the doping amount of the additive accounts for 0.5%-0.8% of the dry weight of the base material; the doping amount of the straw fiber accounts for 2%-10% of the dry weight of the base material; and the mass ratio of the water and the base material is 0.52-0.60, The invention also discloses a preparation method of the straw fiber reinforcement air-entrained concrete. The straw fiber reinforcement air-entrained concrete disclosed by the invention reduces the shrinkage cracking and production cost of air-entrained concrete and solves the problems of straw resource waste, ceramic waste treatment and environmental pollution to a certain degree.

The invention provides four-graded roller compacted concrete suitable for water power hydraulic engineering, the four-graded roller compacted concrete per cubic meter comprises the following components: 49kg-64kg of cement, 78kg-92kg of fly ash, 70kg-71kg of water, 630kg-700kg of sand, 1520kg-1610kg of gravel, 0.98kg-1.42kg of a high efficiency water reducing agent and 0.07kg-0.14kg of an air entraining agent, the mass ratio of super large stone (80mm-120mm): large stone (40mm-80mm): middle stone (20mm-40m m): small stone (5mm-20mm) is 20:30:30:20. The four-graded roller compacted concrete is low in cementitious material use amount and low in adiabatic temperature rise, has good working performance, mechanical performance and durability, and can simplify the temperature control measures, improve the construction progress, and reduce cost.

A method for valuing a link-hosting webpage is provided. The method includes the act of receiving, on a computer system, at least one keyword. The method also includes the act of receiving, on a computer system, at least one identifier of a webpage, the webpage having been previously identified as a link-hosting webpage. The method also includes the act of accessing information about the webpage over a computer network. The method also includes the act of determining an importance of the webpage based on the at least one keyword and the information about the webpage. The method also includes the act of displaying the importance on a computer-based user interface.

The invention discloses an SCS (structure cabling system) encased structure based on PBL (planetary boundary layer) stiffening ribs. The SCS encased structure comprises an outer steel tube, an inner steel tube, a plurality of PBL stiffening ribs arranged between the outer steel tube and the inner steel tube, and a concrete structure which is poured and molded by concrete filled inside a cavity between the outer steel tube and the inner steel tube, wherein the outer steel tube, the inner steel tube and the plurality of PBL stiffening ribs are equal in longitudinal length; the plurality of PBL stiffening ribs are arranged along the peripheral direction of the inner steel tube; the inner lateral wall of each PBL stiffening rib and the inner lateral wall of the inner steel tube are fastened and connected into a whole, and the outer lateral wall and the outer lateral wall of the outer steel tube are fastened and connected into a whole. The SCS encased structure is simple in structure, reasonable in design, convenient to construct, low in construction cost, excellent in mechanical property, and good in using effect, and the problems of large dead load of the existing encased structure, poor connection performance of the outer steel tube and the internal concrete, and small hoop effect of the outer steel tube on the internal concrete can be effectively solved.

The invention belongs to the technical field of a building material, and provides fast hardening early strength type composite repair mortar. The mortar is prepared from the following ingredients in percentage by weight: 5 to 10 percent of water, 20 to 30 percent of cement, 1 to 5 percent of silicon ash, 1 to 5 percent of fly ash, 50 to 70 percent of quartz sand, 0.4 to 0.5 percent of compound early strength agents, 0.06 to 0.1 percent of water reducing agents, 1 to 5 percent of rubber powder and 0.06 to 0.8 percent of hybrid fiber, wherein the composite early strength agent is prepared from an ingredient A and an ingredient B; the ingredient A is lithium carbonate; the ingredient B is a mixture of triethanolamine and aluminum sulfate; the quartz sand consists of coarse sand, medium sand and fine sand; and the hybrid fiber consists of basalt fiber and polypropylene fiber. The fast hardening early strength type composite repair mortar solves the problems of reduced strength, high dry shrinkage rate and low bonding strength of the repair mortar in the prior art.

The invention discloses an SCS (structure cabling system) encased structure based on longitudinal stiffening ribs. The SCS encased structure comprises an outer steel tube, an inner steel tube, a plurality of longitudinal stiffening ribs arranged at the inner lateral wall of the outer steel tube, and a concrete structure which is poured and molded by concrete filled inside a cavity between the outer steel tube and the inner steel tube, wherein the outer steel tube and the inner steel tube are coaxially arranged; the plurality of longitudinal stiffening ribs are arranged along the peripheral direction of the inner steel tube; the outer steel tube, the inner steel tube and the plurality of longitudinal stiffening ribs are equal in the longitudinal length, and the transverse width of each longitudinal stiffening rib is the distance between the outer steel tube and the inner steel tube at the arranged positions. The SCS encased structure is simple in structure, reasonable in design, convenient to construct, low in construction cost, excellent in mechanical property, and good in using effect, and the problems of large dead load of the existing encased structure, poor connection performance of the outer steel tube and the internal concrete, and small hoop effect of the outer steel tube on the internal concrete can be effectively solved.

The present invention relates to a building wall body material-coagulating stone brick and hollow block. Its raw material composition includes 11-28% of coagulating stone, 26-40% of coal slag, 32-43% of tails sand and the rest is water. The coagulating stone is a new type building material, and can be used as a substitute for cement.

The invention discloses an environment-friendly low-drying-shrinkage crack-resistant casting waste sand concrete which is formed by mixing the following components in parts by weight: 330-370 parts of cement, 40-80 parts of rice hull ash, 700-780 parts of fine aggregate (formed by screening and mixing casting waste sand and river sand), 1080-1200 parts of coarse aggregate (macadam), 6-9 parts of shrinkage reducing agent, 3.5-5.5 parts of water reducing agent and 125-180 parts of water. The strength level of the environment-friendly low-drying-shrinkage crack-resistant casting waste sand concrete is C45-C55, the 7d drying shrinkage value is 75-100*10<-6>, the 28d drying shrinkage value is 200-250*10<-6>, the 90d drying shrinkage value is 260-300*10<-6>, and the drying shrinkage value trends to be stable; and the early crack resistance is Grade L-V. The environment-friendly low-drying-shrinkage crack-resistant casting waste sand concrete implements high-added-value recycling of the casting waste sand in concrete, and thus, has favorable environment-friendly effect. The fine aggregate, which is formed by screening and mixing the casting waste sand and river sand, effectively improves the grain size distribution of the aggregate. The rice hull ash, shrinkage reducing agent and other components are doped, thereby lowering the drying shrinkage value of the concrete and obviously enhancing the crack resistance from the angle of solid-liquid-phase optimum design.

The invention provides an environmental protection building material and a preparation method thereof, which belong to the field of a building material. The environmental protection building material comprises the following raw materials: 10-30 parts of granite powder, 17-25 parts of alumina silicate powder, 7-13 parts of glass wool, 4-9 parts of polypropylene fiber, 21-35 parts of fine sand, 22-38 parts of broken stone, 15-21 parts of cement, 15-27 parts of waste rock wool plate, 13-21 parts of waste glass, 15-33 parts of meerschaum, 21-27 parts of bamboo charcoal, 0.3-0.7 parts of an air-entrainer, 0.4-0.6 parts of a hardener, 0.3-0.9 parts of a water reducer, and 3-11 parts of water. The preparation method comprises the following steps: 1) weighing the raw materials; 2) crushing the raw materials; 3) stirring the raw materials; and 4) performing compacting moulding, drying the material, and cooling and preserving the product. The method solves the problem that the current environmental protection building materials used for the buildings having high compressive strength, heat insulation, and environmental protection and energy saving requirements are insufficient.

The invention relates to a wall material, in particular to a formula of a wall heat-insulating material. The formula of the wall heat-insulating material comprises the following materials: 10 to 30 percent of spherical closed cell vitrified hollow microsphere with bulk weight of 90kg/m3, 8 to 18 percent of spherical closed cell vitrified hollow microsphere with bulk weight of 130kg/m3, 15 to 35 percent of ground calcium carbonate, 30 to 50 percent of 42.5R cement, 0.5 to 3 percent of wood fiber and 0.5 to 3 percent of dispersible latex powder. During the natural maintenance of the wall heat-insulating material adopting the formula, the wall heat-insulating material overcomes the defect that the common wall heat-insulating material cannot be maintained independently, and ensures that the water absorption and discharge automatically reach certain balance, thereby solving the problems of cracking, hollow joint and dropping-off after the construction; and complicated processes, such as a process of using fiberglass mesh and the like, are not needed so as to greatly reduce the using cost.

The invention discloses an alkaline-free anti-crack concrete shrinkage reducing agent comprising the following components in percentage by weight: 35-66% of I-grade coal ash, 8-18% of polypropylene staple fiber, 2-18% of polyethylene glycol, 3-17% of methacrylic acid, 2-15% of calcium formate, 3-16% of neopentyl glycol and 0.2-0.8% of sodium dodecyl benzene sulfonate. The invention provides possibility for realizing the comprehensive improvement of an additive technology, reducing concrete shrinkage, inhibiting non-loaded cracks and improving the durability of concrete through the research on and application as a shrinkage reducing additive and creates the environment-friendly alkaline-free anti-crack concrete shrinkage reducing agent. The technology is simple in feeding way, easily-controlled in production condition, simple in process and capable of producing the alkaline-free anti-crack concrete shrinkage reducing agent which is low in alkaline content and mixing amount and capable of effectively controlling the shrinkage of concrete. The alkaline-free anti-crack concrete shrinkage reducing agent has a relatively good social benefit and a relatively high economic benefit.

The invention relates to a pre-buried molding frame of composite block and the casting and forming method of block, characterized in that the pre-buried molding frame comprises external peripheral frame (1) and internal frame (2); connecting rib (3) is set to connect the internal frame (2) and the external peripheral frame (1); cavity (5) is set in the internal frame. The casting and forming method of composite block adopts the pre-buried molding frame mentioned above and is carried out according to following procedures. a. the mixture of foaming concrete and ceramic grain is cast in the external molding cavity between the external peripheral frame and the internal frame. b. polystyrene foaming grain is cast in the cavity in internal frame. c. after material is dried and solidified, six-face cutting is carried out with the unit of internal frame to form rectangle body of composite block. The invention comprises following merits. The pre-buried molding frame of composite block is fabricated simply and can be produced according to normal forming process for block and the material. Not only multi-layer composite heat-preservation block can satisfy wall self-heat preservation synthesis performance but also the invention is provided with simple producing method, small investment and high efficiency.

The invention discloses a full-granularity steel slag pavement base material for a heavy-load pavement The full-granularity steel slag pavement base material is prepared by adding water into a dry material and uniformly mixing, and the dry material comprises 3.4-5.0% of a cementing material and 95.0-96.6% of steel slag aggregate; the cementing material is prepared by mixing 70-90% by mass of cement and 10-30% by mass of steel slag micro-powder according to a certain ratio; and the water accounts for 5-6% of the total mass of the dry material. Excellent physical properties and potential gellingactivity of the steel slag are utilized, the base material with high strength, small cement dosage and reduced dryness can be prepared without additives, the base material is suitable for the heavy-load pavement, and the service life of the heavy-load pavement is prolonged; and an application of the full-granularity steel slag in the base material is realized, natural resources are effectively saved, the problems of environmental pollution and the like caused by improper treatment of the steel slag are reduced, the production cost is reduced, and remarkable social, economic and environmentalbenefits are achieved.