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Annular truss-type large space foldable mechanism
ActiveCN103794842AIncreased folding ratioImprove unwrapping performanceCollapsable antennas meansAntenna supports/mountingsMechanical engineeringEngineering
The invention provides an annular truss-type large space foldable mechanism which is formed by connecting a plurality of identical 6R mechanism foldable units in an end-to-end mode and in an annular mode. The 6R mechanism foldable units can be symmetrical in the longitudinal direction and in the transverse direction. Each 6R mechanism foldable unit comprises two identical supporting rods and four identical chord members, wherein the two supporting rods are longitudinally arranged in parallel; the four chord members include two upper chord members and two lower chord members, the starting ends of the two upper chord members are connected to the upper ends of the two supporting rods through a revolute pair respectively, the tail ends of the two upper chord members are mutually connected through a revolute pair, the starting ends of the two lower chord members are connected to the lower ends of the supporting rods through a revolute pair respectively, the tail ends of the two lower chord members are mutually connected through a revolute pair, each chord member is movably connected with the adjacent supporting rod through a sliding block crank mechanism, sliding blocks are arranged on the supporting rods in a sleeved mode, one end of each crank is connected with the corresponding chord member through a revolute pair, the other end of each crank is connected with the corresponding sliding block through a revolute pair, and the length of the supporting rods is more than twice that of the chord members. The annular truss-type large space foldable mechanism has a high foldable ratio.
Owner:HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
Space deployable mechanism
ActiveCN103786906AImprove reliabilityStrong expandabilityCosmonautic vehiclesCosmonautic partsEngineeringMachining
The invention provides a space deployable mechanism comprising multiple identical folding deployable units which are arranged symmetrically left and right. Each folding deployable unit comprises two identical vertical rods arranged longitudinally, two identical first chord members, two identical second chord members and two identical third chord members, wherein the starting ends of the two first chord members are connected to the upper ends of the two vertical rods through rotating pairs respectively, the tail ends of the two first chord members are mutually connected through a rotating pair to form a V-type rod, the middles of the two second chord members are mutually connected through a rotating pair to form a scissor form mechanism, the starting ends of the two second chord members are connected to the lower ends of the two vertical rods through rotating pairs respectively, the starting ends of the two third chord members are connected to the lower middle parts of the two vertical rods through rotating pairs respectively, and the tail ends of the two third chord members are connected to the tail ends of the two second chord members through rotating pairs respectively. The space deployable mechanism is good in deployable performance, high in rigidity and error containment and low in machining and manufacturing requirement.
Owner:HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
9RR-12URU-3URU symmetrical extendable basic unit mechanism
A 9RR-12URU-3URU symmetrical extendable basic unit mechanism includes 10 face plates, 9 swing rods with equal lengths, 6 folded rods I, 6 folded rods II, 3 folded rods III, 33 revolute pairs (R) and 30 Hooke joints (U). Six of the face plates at the periphery in the upper layer are connected with the central face plate through the folded rods I and are connected with each other through the folded rods II. Three of the face plates in the lower layer are connected to each other through the folded rods III. Each of the folded rods is formed by connecting two connecting rods of equal lengths through one of the revolute pairs, and two ends of the folded rod are connected with the face plates through the Hooke joints. Each of the face plates in the lower layer is connected with the central face plate and two of the face plates at the periphery in the upper layer through three of the swing rods. Two ends of each swing rod are connected with the face plates through the revolute pairs. The central face plate and the face plates at the periphery in the upper layer are on the same spherical surface and form a regular hexagon with the face plates at the periphery as vertices. The mechanism is simple in structure, high in rigid, and easy for implementation of engineering manufacture. The mechanism can fold all face plates simultaneously and can adjust the folded face plate attitudes, and has a high folding ratio.
Owner:YANSHAN UNIV
Dedicated fireproof insulation panel for building external wall
The invention discloses a dedicated fireproof insulation panel for a building external wall. The dedicated fireproof insulation panel comprises the following raw materials: cement, river sand, ferrous mill tailings, pebbles, rubbles, vitrified microsphere, oil shale, coal ash, coal gangue, silica fume, modified polystyrene granules, polyurethane particles, polycarbonate, neoprene latex, epoxy resin emulsion, water reducing agent, air entraining agent, carbon fiber, polypropylene fiber, mullite fiber, and water. The dedicated fireproof insulation panel for the building external wall provided by the invention is light in weight, low in heat conducting coefficient, good in insulation and heat-shielding performance and excellent in compressive property and fireproof performance.
Owner:安徽城洁环境科技有限公司
Preparation method of composite cement with low clinker dosage and high flexural compression ratio
The invention discloses a preparation method of composite cement with low clinker dosage and high flexural compression ratio. The preparation method is to mix three size ranges of powder particles and obtain the composite cement. The three size ranges of powder particles are as follows: 1) the grain size of particles is less than 8mu m, the particles are composed of high-activity supplementary cementing material with the grain size; 2) the grain size of particles is 8-24mu m, the particles are composed of cement clinker particles with the grain size; and 3) the grain size of particles is 24-80mu m, and the particles are composed of low-activity supplementary cementing material or inert filler. The volume percentages of the three size ranges of powder particles are 25-40%, 25-30% and 30-45% respectively. The clinker volume percentage of the composite cement is 25-30%, the 28-day compressive strength is up to 35-50MPa, the flexural strength is up to 10-12Mpa, the flexural compression ratio is 1 / 3-1 / 4; and the composite cement has low hydration heat and good anti-cracking capability and can be used in the civil construction / engineering with the demand on the anti-cracking capability.
Owner:SOUTH CHINA UNIV OF TECH
Modified cement slurry for rapidly repairing concrete
ActiveCN105130314AIncreased durabilityIncreased folding ratioSolid waste managementCement slurryChloride ion penetration
The invention discloses a modified cement slurry for rapidly repairing concrete, comprising following components in weight ratio: 30-70% of cement, 15-55% of aggregates, 12-15% of fly ash, 2.5-7.5% of latex powder, 0.25-5.5% of early strength admixture, and 0.25-1% of antifoaming agent. The modified cement slurry also comprises an expanding agent by weight of 0-2.5% of total weight and a thickening agent by weight of 0-2.5% of total weight. The modified cement slurry for rapidly repairing concrete can quicken the initial set of the cement slurry, promote water reducing rate of mortar, reduce unit weight of the newly-stirred mortar, and obviously promote flexural compression ratio, binding intensity and chloride ion penetration resistance of slurry, and the durability of concrete after rapidly repairing.
Owner:SHANGHAI LIYANG ROAD REINFORCEMENT TECH
Single component alkali-activated cementing material taking lime-sodium carbonate as activator
The invention discloses a single component alkali-activated cementing material taking lime-sodium carbonate as an activator, wherein the mole ratio of lime to sodium carbonate is 1:1, a volcanic ash active material is taken as the object to be activated, and the cementing material is obtained by dry-mixing lime, sodium carbonate, and the volcanic ash active material. The compressive strength of the cementing material is 1.2 to 1.3 times stronger than that of cement (P.O 42.5). Water can be directly added into the cementing material and then the cementing material can be used. During the primary period of blending, the alkalinity is low, the setting time is proper, furthermore, the setting time can be adjusted by adjusting the added alkali amount or the ratio of quick lime to slaked lime, and the cementing material has a good application prospect in engineering.
Owner:FUZHOU UNIV
Thermal insulation mortar using rubber powder of waste tire
InactiveCN101643347AIncreased resistance to deformationImprove crack resistanceSolid waste managementFiberPolymer science
The invention aims to provide a thermal insulation mortar using large amount of waste tire, comprising tire rubber, cement, emulsion powder, fiber and cellulose ether and the like; the main proportionof cement to emulsion powder to tire rubber is 1:0.2:0.6; the particle size of tire rubber particle is in the range of 0.1-5 mm; thus, high flexible thermal insulation mortar of rubber powder is doped; by researching and testing the performances of flexible mortar, the intensity of mortar can be reduced by rubber powder to improve compression strength of mortar, thereby increasing resistance to deformation of the thermal insulation mortar, and improving the anti-cracking performance of the thermal insulation mortar. The invention has the characteristics of fine chemical resistance, no water absorption, great toughness, fine anti-cracking performance and fine thermal insulation performance, and is used for preparing thermal insulation mortar, thereby not only showing thermal insulation andenergy saving of buildings, but also having fine environmental effect.
Owner:苏州同济材料科技股份有限公司
Anti-cracking anti-permeability concrete baffle special for mountain slope
The invention discloses an anti-cracking anti-permeability concrete baffle special for a mountain slope. The anti-cracking anti-permeability concrete baffle comprises the following raw materials in parts by weight: 80-100 parts of cement, 250-400 parts of rubbles, 10-30 parts of quartz sand, 10-35 parts of cordierite, 2-8 parts of semi-hydrate phosphogypsum, 2-15 parts of calcined kieselguhr, 10-25 parts of modified steel fiber, 3-12 parts of basalt fiber, 1-10 parts of sisal hemp fiber, 2-15 parts of carbon fiber, 2-15 parts of nanometer silicon dioxide, 3-11 parts of nanometer calcium carbonate, 20-45 parts of coal ash, 20-35 parts of iron ore, 2-5 parts of styrene-acrylic emulsion, 1-5 parts of carboxyl butylbenzene emulsion, 1-5 parts of epoxy resin emulsion, 2-10 parts of polycarboxylate-type water reducer, 3-8 parts of an additive and 20-35 parts of water. The anti-cracking anti-permeability concrete baffle special for the mountain slope provided by the invention has excellent anti-cracking property, permeability resistance and durability and can meet the use requirement of the slopes such as mountains and rivers.
Owner:安徽城洁环境科技有限公司
Graph theory-based comprehensive configuration method for spatial prismatic expandable unit mechanism folded into straight line
ActiveCN107133410AImprove efficiencyImprove accuracyGeometric CADSpecial data processing applicationsConfiguration designMathematical Graph
The invention discloses a graph theory-based comprehensive configuration method for a spatial prismatic expandable unit mechanism folded into a straight line, relates to a comprehensive expandable unit mechanism configuration method, and aims to solve the problems that an artificial mechanism is low in comprehensive efficiency and leakage is easily caused. The comprehensive configuration method comprises the following steps: 1) according to stability judging criterions of a hinged truss system, establishing a static truss structure and an adjacently connected matrix of a spatial prismatic expandable unit mechanism; 2) by using an embryonic graph interpolation point method, and static truss spectrum as an embryonic graph, interpolating a certain number of second-degree points in appropriate positions, and converting a static truss structure into the spatial prismatic expandable unit mechanism; and 3) performing isomorphism judgment on the comprehensive spatial prismatic expandable unit mechanism, and rejecting coincident configurations, thereby obtaining a non-coincident spatial prismatic expandable unit mechanism. The method can be applied to comprehensive configuration design of spatial prismatic expandable unit mechanisms which are used for assembling spatial expandable mechanisms such as parabolic antennas and can be folded into straight lines.
Owner:HARBIN INST OF TECH
Anti-seismic wall material and method for preparing same
The invention discloses an anti-seismic wall material and a method for preparing the same. The anti-seismic wall material in a formula comprises, by weight, 5-30 parts of cement, 5-20 parts of lime, 50-70 parts of fly ash, 0.5-5 parts of gypsum, 5-25 parts of regenerated rubber powder and an appropriate amount of water. The method includes digesting the lime; weighing the components, pouring raw materials into a stirrer, stirring the raw materials under a dry condition for 2 minutes, then adding the appropriate amount of water into the stirrer and stirring the raw materials again for 3-5 minutes to obtain mixtures; pouring the stirred mixtures into brick molds or building block molds and vibrating and molding the stirred mixtures for 1-2 minutes; maintaining the mixtures for a day at the temperature of 20-30 DEG C under the condition of humidity higher than 50%, or delaying curing of the mixtures for 1 hour, then maintaining the mixtures in wet steam at the temperature of approximately 90 DEG C for 6-8 hours, and removing the mixtures from the molds to obtain bricks or building blocks; maintaining the bricks or the building blocks in high-temperature and high-pressure saturated steam at the temperature of 150-180 DEG C for 7-12 hours to obtain finished products. The anti-seismic wall material has the advantages of light weight, low elastic modulus, good elasticity, excellent toughness and ductility, high ratio of bending-compressive strength, heat insulation and the like.
Owner:YANCHENG INST OF TECH
Normal-temperature weak-alkali geopolymer excited cement soil and preparation process thereof
ActiveCN110294611AEasy to useHigh compressive strengthCement productionCompressive resistanceActive agent
The invention discloses normal-temperature weak-alkali geopolymer excited cement soil and a preparation method thereof. The cement soil is prepared from an alkali-excited gelling material and clay; wherein the alkali-excited gelling material comprises an active agent and an exciting agent; and taking the clay as reference, the mixing amount of the active agent is 6 to 12 percent and the mixing amount of the exciting agent is 3 to 11 percent. The normal-temperature weak-alkali geopolymer excited cement soil is formed by taking clay as the main raw material, mixing with the active agent and theexciting agent in a dry mixing way and adding water to completely mix, wherein the strength of the mixing initial period is low and the setting time is moderate. The uniaxial compressive strength of the cement soil is measured through an unconfined compression test; and the test indicates that when the mixing amount ratio of the alkali-excited gelling material to the clay is approximately 1:5 andthe mixing amount ratio of the active agent to the exciting agent is 2:1, the mass ratio of components in the exciting agent is 1:1 and the compressive strength of the cement soil is optimal. Throughcomparison, it is found that the uniaxial compressive strength of the mixed material is 2 times that of a pure clay test sample and is 1.5 times that of a limestone soil test sample, and good application prospect in roadbed construction is achieved.
Owner:NANJING UNIV OF TECH
Environment-friendly graphene oxide modified ultra-high performance concrete and preparation method thereof
ActiveCN110922142AReduce water consumptionAvoid contamination riskCarbon compoundsSlagCarboxylic acid
The invention discloses an environment-friendly graphene oxide modified ultra-high performance concrete. According to the parts by mass, the raw materials include 945.86-962.40 part of cementitious material and 80-120 parts of steel fiber and also include water, quartz sand, graphene oxide and polycarboxylic acid high performance water reducing agent, wherein the mass ratio of the water to the cementitious material is 0.16, the mass ratio of the quartz sand to the cementitious material is 1.3, the mass of the polycarboxylic acid high performance water reducing agent powder is 0.3% of the massof the cementitious material, the cementitious material consists of 394.60-401.50 parts of cement, 156.66-159.40 parts of silica fume, 313.31-318.79 parts of fly ash and 81.29-82.71 parts of slag powder, the mass of the graphene oxide is 0.01-0.03% of the mass of the cement, and the solid amount of the polycarboxylic acid high performance water reducing agent is 0.3% of the mass of the cementitious material. The concrete is modified by graphene oxide while adding mineral fine powder. The higher content of mineral fine powder greatly reduces the content of cement and silica fume, while the graphene oxide modification effectively improves the folding-compression ratio and toughness of the concrete accordingly.
Owner:重庆高途新材料科技有限公司
Preparation method and application of special adhesive mortar material for foam glass external thermal insulation system
InactiveCN111747705AIncreased folding ratioHigh bonding strengthClimate change adaptationHeat proofingCelluloseWeather resistance
The invention discloses a special adhesive mortar material for a foam glass thermal insulation system and a preparation method and application thereof. The adhesive mortar is prepared from the following raw materials in percentage by mass 25%-50% of P.O 4.25 cement, 1%-10% of fly ash, 1%-5% of silica fume, 48%-60% of medium sand, 1.5%-3% of redispersible latex powder, 0.03%-0.18% of hydroxypropylmethyl cellulose, 0.15%-0.25% of polypropylene fiber, 0-0.1% of a defoaming agent and 0-0.1% of a water reducing agent. The adhesive mortar has high flexibility and damage resistance, has higher bonding strength, higher flexibility, higher damage resistance and higher weather resistance compared with traditional mortar, and has the advantages of being easy to construct and the like.
Owner:SHANGHAI UNIV +2
Insulation board for building external wall
InactiveCN106830784AHigh strengthImprove thermal insulationClimate change adaptationHeat proofingCelluloseFiber
The invention discloses an insulation board for a building external wall, comprising a polystyrene board and a concrete protective layer cladded outside the polystyrene board, wherein the weight ratio of the polystyrene board to the concrete protective layer is (2-3):100; and the concrete protective layer is prepared from the following raw materials in parts by weight: 200-350 parts of cement, 80-120 parts of yellow sand, 30-80 parts of iron mine tailings, 30-80 parts of pebbles, 20-50 parts of broken brick, 10-40 parts of perlite, 20-50 parts of oil shale, 2-10 parts of nano calcium carbonate, 2-10 parts of silica fume, 20-50 parts of polystyrene particles, 5-15 parts of polycarbonate, 1-3.8 parts of neoprene latex, 0.5-1 part of a water reducer, 0.1-0.2 parts of cellulose ether, 0.1-0.5 part of an air entraining agent, 0.05-0.1 part of boric acid, 0.2-1 part of polyvinyl alcohol fibers, 0.1-1 part of mullite fibers and 60-110 parts of water.
Owner:安徽城洁环境科技有限公司
Preparation method of polymer steel slag cement concrete
The invention discloses a preparation method of a polymer steel slag cement concrete. The method comprises preparing polyphenylene sulfide emulsion; in a liquid-after-solid sequence, uniformly mixing,by weight part, 5-30 parts of cement, 10-40 parts of steel slag, 14-26 parts of sand, 10-30 parts of gravel, water reducer 0-0.3% as heavy as the steel slag, defoamer 0-3% as heavy as polyphenylene sulfide, 10-25 parts of the polyphenylene sulfide emulsion and 15-25 parts of water inside a mixing container to prepare the polymer steel slag cement concrete. The prepared polymer steel slag cement concrete reduces the content of alkali and chlorine ions, increases the rupture strength, the compressive strength and the bending-pressing ratio, significantly enhances strength as well as tenacity, achieves high wearing resistance and is good in durability when applied to road and bridge pavement.
Owner:SHANGHAI MUNICIPAL ENG DESIGN INST GRP
Frame folding mechanism for manned moon rover
ActiveCN106114631AHighly foldableIncreased folding ratioUnderstructuresExtraterrestrial carsVehicle frameAgricultural engineering
The invention discloses a frame folding mechanism for a manned moon rover. A front frame and a rear frame are of the same structure and are symmetrically arranged with respect to a middle frame. Both the front frame and the rear frame are hinged to the middle frame so that the front frame and the rear frame can be folded oppositely. Middle wheels are symmetrically mounted on the left side and the right side of the middle frame. Front wheels are symmetrically arranged on the left side and the right side of the front end of the front frame. Rear wheels are symmetrically arranged on the left side and the right side of the rear end of the rear frame. The front wheels and the rear wheels are hinged to suspensions on the corresponding frames so that the front wheels and the rear wheels can swing upwards in the pitching direction. When the front frame and the rear frame are oppositely folded in place, each front wheel and the rear wheel on the corresponding side are attached together. According to the frame folding mechanism for the manned moon rover, the frames and a moving system can be highly folded, the folding ratio of the manned moon rover is effectively increased, and the initial storage volume of the manned moon rover in the launching process is reduced; the frame folding mechanism has the characteristics of being reasonable in design, easy to implement, low in cost and the like; and folding is easy, convenient and fast, and the whole manned moon rover is regular and attractive in appearance and convenient to carry after being folded.
Owner:CHONGQING UNIV +1
A ring truss type large space expandable mechanism
ActiveCN103794842BEasy to driveAvoid problemsCollapsable antennas meansAntenna supports/mountingsMechanical engineeringBellcrank
The invention provides an annular truss-type large space foldable mechanism which is formed by connecting a plurality of identical 6R mechanism foldable units in an end-to-end mode and in an annular mode. The 6R mechanism foldable units can be symmetrical in the longitudinal direction and in the transverse direction. Each 6R mechanism foldable unit comprises two identical supporting rods and four identical chord members, wherein the two supporting rods are longitudinally arranged in parallel; the four chord members include two upper chord members and two lower chord members, the starting ends of the two upper chord members are connected to the upper ends of the two supporting rods through a revolute pair respectively, the tail ends of the two upper chord members are mutually connected through a revolute pair, the starting ends of the two lower chord members are connected to the lower ends of the supporting rods through a revolute pair respectively, the tail ends of the two lower chord members are mutually connected through a revolute pair, each chord member is movably connected with the adjacent supporting rod through a sliding block crank mechanism, sliding blocks are arranged on the supporting rods in a sleeved mode, one end of each crank is connected with the corresponding chord member through a revolute pair, the other end of each crank is connected with the corresponding sliding block through a revolute pair, and the length of the supporting rods is more than twice that of the chord members. The annular truss-type large space foldable mechanism has a high foldable ratio.
Owner:HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
Ketene concrete glue reducing agent and preparation method thereof
ActiveCN111892678AHigh strengthStrong adsorption capacitySolid waste managementStructural engineeringGlycol synthesis
The invention discloses a ketene concrete glue reducing agent and a preparation method thereof. The ketene concrete glue reducing agent is prepared from the following substances in parts by weight: 8-25 parts of dimethylacrylic acid, 8-20 parts of ketene monomer, 3-10 parts of ethylene glycol, 2-8 parts of retarder, 0.5-3 parts of initiator and the balance of water. According to the invention, theworking performance of the concrete can be improved, specifically, the cement can be more fully dispersed in the concrete, and the utilization rate of the cement is higher so that the early strengthand the later strength of the concrete are remarkably improved; in addition, the later toughness and the crack resistance of the concrete are also improved. Because the glue reducing agent has the effects of improving the strength and crack resistance of the concrete, on the premise of keeping the strength of the concrete unchanged in engineering operation, the cement consumption of concrete per unit volume can be reduced, and the service life of a concrete building is prolonged so that the engineering cost is reduced.
Owner:浙江鑫美博新材料有限公司
Baking-free brick and preparation method thereof
ActiveCN114014618AHigh strengthImprove flexural strengthSolid waste managementGlass fiberCompression molding
The invention relates to a baking-free brick which is prepared from the following raw materials in parts by weight: 30-45 parts of waste asphalt concrete, 10-15 parts of regenerated glass fiber reinforced plastic fibers, 15-20 parts of fly ash and 15-20 parts of lime powder. The baking-free brick is prepared by taking the waste asphalt concrete and the regenerated glass fiber reinforced plastic fibers as main materials, taking the fly ash and the lime powder as auxiliary materials, adding 15-20 parts of water, stirring and mixing, and carrying out compression molding and steam curing. The preparation method comprises the following steps of: crushing and sieving the waste asphalt concrete; cutting and crushing glass fiber reinforced plastic plate-shaped waste to obtain glass fiber reinforced plastic regenerated powder and glass fiber reinforced plastic regenerated fibers; adding water into the treated waste asphalt concrete, the treated regenerated glass fiber reinforced plastic fibers, the fly ash and the lime powder according to the proportion, stirring, and mixing well to obtain a mixture; weighing the mixture and pressing the mixture into a green brick; and performing steam curing on the prepared green brick, and cooling to obtain the baking-free brick. The prepared baking-free brick is more compact in structure, and the average compressive strength and the breaking strength are further improved.
Owner:CHINA CONSTR EIGHTH ENG DIV
Cement slurry for concrete repair
The invention relates to cement slurry for concrete repair. The cement slurry for concrete repair comprises the following components in parts by mass: 30-60 parts of cement, 20-50 parts of a carboxyl material, 12-16 parts of coal ash, 5-10 parts of a butylbenzene emulsion, 0.5-5.5 parts of an early strength agent and 0.2-0.8 parts of a defoamer. The cement slurry for concrete repair provided by the invention has the advantages that according to the cement slurry for concrete repair provided by the invention, the carboxyl material is added into the formula, so that initial set of cement slurry can be accelerated, the water reducing rate of mortar can be improved, and the volume-weight of newly mixed mortar is reduced; the ratio of bending strength to compressive strength and the adhesive strength of the mortar are obviously improved, so that the quickly repaired concrete is better in durability.
Owner:如皋市磨头建设开发有限公司
Reinforced polymer cement concrete and preparation method thereof
The invention discloses reinforced polymer cement concrete, which is prepared from the following raw materials in parts by weight: 100 parts of cement, 5 to 15 parts of polyphenylene sulfide emulsion, 1 to 2 parts of nano silicon dioxide, 4 to 8 parts of nano diatomite, 20 to 50 parts of coarse aggregate, 5 to 15 parts of sand powder, 1 to 2 parts of a reinforcing synergist, 1 to 2 parts of a coupling agent, 1 to 2 parts of a naphthalene type water reducer, 0.1 to 1 part of alkyl tin carboxylate, 0.1 to 1 part of pentaerythritol, 0.1 to 1 part of an anti-permeability synergist, 0.1 to 0.2 part of dimethyl sulfoxide and 40-80 parts of an ethanol water solution. The invention also discloses a preparation method of the reinforced polymer cement concrete. According to the invention, the concrete structure can be effectively promoted to form a stable and fine structure, so that the volume stability of the concrete is ensured, the breaking strength, the compressive strength and the flexural-compressive ratio are enhanced, the toughness is also obviously improved, and the wear resistance is relatively strong.
Owner:安徽筑园景新型建材科技有限公司
Concrete baffle special for mountain slopes
The invention discloses a concrete baffle special for mountain slopes, the concrete baffle comprises the following raw materials by weight: 100 parts of cement, 250-350 parts of stones, 100-200 parts of quartz sand, 10-35 parts of coal gangue, 30-50 parts of modified steel fiber, 20-50 parts of corn straw powder, 5-12 parts of talcum powder, 10-35 parts of nano calcium carbonate, 20-35 parts of fly ash, 20-35 parts of silica fume, 20-35 parts of iron sand, 2-5 parts of epoxy resin emulsion, 1-5 parts of nitrile rubber powder, 2-10 parts of a water reducing agent, 2-5 parts of an additive and 20-50 parts of water; the additive includes raw materials of hydroxy alkyl sodium sulfonate, zinc stearate, zinc borate, sodium gluconate, acetyl tributyl citrate, benzoic acid, dicyclopentadiene dioxide and alumina. The concrete baffle special for the mountain slopes has excellent anti cracking performance, and has good impermeability and durability.
Owner:安徽城洁环境科技有限公司
Quick-hardening cement prepared from waste residues and preparation method thereof
The invention relates to quick-hardening cement prepared from waste residues and a preparation method thereof. The quick-hardening cement is prepared from waste magnesia bricks, waste gypsum, ammoniumdihydrogen phosphate, borax and a mineral admixture according to a certain weight ratio. The quick-hardening cement has the advantages that the setting time is easier to regulate and control, the strength is high, the folding-pressing ratio is large, the binding power is high, and the water resistance and the stability are good.
Owner:HANGZHOU ROADMENDER TECH CO LTD
Colored permeable pavement material and preparation process thereof
ActiveCN113845351AKeep the colorImprove stress resistanceSolid waste managementCrushed stoneStructural engineering
The invention discloses a colored permeable pavement material and a preparation process thereof. The pavement material comprises the following raw materials in parts by weight: 500-600 parts of colored crushed stone aggregate, 5-25 parts of slag, 5-25 parts of expanded vermiculite, 10-30 parts of fly ash, 150-250 parts of an adhesive, 10-25 parts of a reinforcing agent, 10-15 parts of a water reducing agent and 150-200 parts of water, wherein the colored crushed stone aggregate is crushed stone aggregate with the surface and gaps filled with an impregnant. According to the permeable pavement material disclosed by the invention, after the crushed stone aggregate is treated by the impregnant, compared with a traditional manner of spraying the crushed stone aggregate on the surface of a pavement after completion of pavement construction, the impregnant plays a role in protection and reinforcement, and can be used as a protective layer to improve the wear resistance of the crushed stone aggregate; and moreover, the compressive strength of the aggregate can be further enhanced by filling of the gaps of the aggregate, so the colored crushed stone aggregate is not easy to crush and fade, the compressive capacity of the pavement can be improved, the color of the pavement can be kept more enduringly, and the functionality and attractiveness of the pavement are maintained.
Mortar for exterior facing
The invention relates to relates to mortar for exterior facing and belongs to the technical field of mortar in chemistry. The mortar for the exterior facing is prepared from the following components by mass: component I: 90-110 parts of a mixture of 90% of ordinary Portland cement and 10% of coal ash or 10% of limestone powder; component II: 90-110 parts of a mixture of one part of medium sand with particle size being 0.5-0.35 mm and two parts of superfine sand with particle size being 0.25 mm or less; component III: 40-45 parts of water; component IV: 0.4-0.6 parts of EVA latex powder. The mortar for the exterior facing is prepared by steps as follows: mixing the component II with the EVA latex powder evenly, adding part of water in the component III for mixing, and adding the component I and all remaining water in the component III for mixing after the medium sand and the superfine sand are completed covered with the EVA latex powder. The mortar for the exterior facing has the advantages of good cohesive force, small shrinkage value and good weather resistance.
Owner:SUZHOU SHIHAO BUILDING MATERIAL NEW TECH ENG
Colored-slurry sealing layer and preparation method thereof
The invention discloses a colored-slurry sealing layer. The colored-slurry sealing layer is characterized by containing the following components in parts by weight: 100 parts of solid powder, 16-24 parts of resin emulsion and 5-15 parts of water, wherein the solid powder contains the following components in percent by weight: 8% of white superfine calcined kaolin, 64% of white-corundum non-slip aggregate, 13% of metakaolin, 8% of sodium silicate, 4.5% of weather-resistant type pigment and 1.5% of p-toluenesulfonic acid as a curing agent; the resin emulsion contains the following components inpercent by weight: 95% of silicone acrylic emulsion and 5% of fluorocarbon resin emulsion. The colored-slurry sealing layer disclosed by the invention has the advantages that the technical scheme hashigher early strength and flexural compression ratio: the compressive strength after 3 days is more than 15MPa; the flexural strength after 3 days is more than 5MPa; under the normal-temperature drying condition, the adhesion force to asphalt pavements and cement-concrete pavements is good: the adhesion force of the asphalt pavements after a 3-day age is more than 0.6MPa; the adhesion force of theasphalt pavements after a 28-day age is more than 0.9MPa.
Owner:江苏顺晟新材料科技有限公司
Preparation method of composite cement with low clinker dosage and high flexural compression ratio
ActiveCN101948255BReduce water demandLow initial porosityCement productionLow activityFlexural strength
The invention discloses a preparation method of composite cement with low clinker dosage and high flexural compression ratio. The preparation method is to mix three size ranges of powder particles and obtain the composite cement. The three size ranges of powder particles are as follows: 1) the grain size of particles is less than 8mu m, the particles are composed of high-activity supplementary cementing material with the grain size; 2) the grain size of particles is 8-24mu m, the particles are composed of cement clinker particles with the grain size; and 3) the grain size of particles is 24-80mu m, and the particles are composed of low-activity supplementary cementing material or inert filler. The volume percentages of the three size ranges of powder particles are 25-40%, 25-30% and 30-45% respectively. The clinker volume percentage of the composite cement is 25-30%, the 28-day compressive strength is up to 35-50MPa, the flexural strength is up to 10-12Mpa, the flexural compression ratio is 1 / 3-1 / 4; and the composite cement has low hydration heat and good anti-cracking capability and can be used in the civil construction / engineering with the demand on the anti-cracking capability.
Owner:SOUTH CHINA UNIV OF TECH
Synthetic Method of Mechanism Configuration of Spatial Prismatic Deployable Units Foldable into Straight Lines
ActiveCN107133410BImprove efficiencyImprove accuracyGeometric CADSpecial data processing applicationsGraph spectraConfiguration design
Owner:HARBIN INST OF TECH
Modified cement slurry for concrete repair and preparation method thereof
The invention discloses a modified cement mortar for concrete repair and a preparation method thereof. The preparation method comprises the following steps: a) weighing and mixing predetermined amounts of cement, aggregate and fly ash; b) adding predetermined amounts of a butylbenzene emulsion, an antifoaming agent and an early strength agent into tap water and mixing the obtained solution with the mixture prepared in the step a); and c) controlling the fluidity of mortar to be in a range of 140 + / - 5 mm, separately measuring flow-table fluidity and unit weight of the newly-mixed mortar and carrying out casting molding for repairing when the determined flow-table fluidity and unit weight of the newly-mixed mortar are substantially identical to to-be-repaired concrete. According to the modified cement mortar for concrete repair and the preparation method thereof, initial set of the cement mortar can be accelerated, the water-reducing rate of the mortar can be increased, the unit weight of the newly-mixed mortar can be decreased, the ratio of bending-compressive strength of the mortar can be obviously enhanced, and rapidly repaired concrete has better durability.
Owner:SHANGHAI LIYANG ROAD REINFORCEMENT TECH
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