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35results about How to "Affects durability" patented technology
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Thermal-insulating binded composite wall with supporter
InactiveCN1982554AStrong construction feasibilityReduce thermal bridgesWallsClimate change adaptationVertical barInsulation layer
Supported bundling insulated composite wall, relates to outer insulated composite wall for buildings. The purpose of this invention is to solve the problem that existing blocks have their heat bridge, great impact the energy-saving of construction and can not reach the low heat transfer coefficient of the wall. The inner terminal of concrete cantilever strutting piece (2), the level connecting link (7) and plastic bulging nails (9) of the invention are fixed within the concrete structure of the main building (10) or basal wall (1), the outer terminal of concrete cantilever strutting piece (2) and the level connecting link (7) are connecting fixed with vertical steel bars (5) in the outer protective layer, an insulating layer (3) is fixed outer flank of basal wall (1) by plastic bulging nails (9)outer flank of insulating layer (3) is the vertical steel bars (5), out or inside of the bars is set with metal network (4), the outer ends of metal network (4), the vertical bars (5) and the plastic bulging nails (9) are fixed together, the protective layer (8) built by cement mortar or pisolith concrete is found outside the insulation layer (3).the present invention is safe, durable ,with good heat-insulating and fire resisting properties.
Owner:吴淑环
Plant-mixed warm recycled asphalt mixture and preparation method thereof
InactiveCN106009719AAffect low temperature crack resistanceAffects durabilityBuilding insulationsRoad surfaceAsphalt
The invention relates to a road surface construction material, in particular to a plant-mixed warm recycled asphalt mixture and a preparation method thereof. The plant-mixed warm recycled asphalt mixture comprises the following components in percentage by mass: (20-70)% of RAP, (0 to 8)% of new aggregate, (0 to 8)% of limestone mineral powder, (0.5 to 5)% of new asphalt and (0 to 0.5)% of recycling agent, wherein the total mass percentage is 100%, the new asphalt has penetration of less than 75 (0.1mm) and a softening point of more than 48 DEG C, and the recycling agent has kinematic viscosity of (50-60000) mm2 / s at a temperature of 60 DEG C. The plant-mixed warm recycled asphalt mixture provided by the invention has the advantages of simple process, no grey material, good recycling effect, low cost, wide adaptability and good road performance.
Owner:JIANGSU TIANNUO ROAD MATERIAL TECH
A process for preparing active mixed materials by belt sintering of coal gangue
The invention discloses a process for preparing an activated mixed material through strand sintering of coal gangue. The process comprises the following steps: (1) crushing; (2) preparing materials, and uniformly mixing, namely sufficiently and uniformly mixing crushed coal gangue, quick lime, a carbon fuel and water in a cylinder mixing machine in a set ratio; (3) pelletizing, namely pelletizingthe uniformly mixed minerals into beads of a preset granularity; (4) sintering, namely performing allocation, ignition, air sucking sintering and cooling on the pelletized beads in a strand air sucking sintering machine; (5) crushing and finely grinding, namely crushing the sintered material, and finely grinding till a set specific surface area, thereby obtaining the activated mixed material. Theinvention provides the process for preparing an activated mixed material through strand sintering of coal gangue, by virtue of the properties that a combustion zone is high in temperature and short intime in the sintering process, a vitric phase can be formed, meanwhile, the sintered material mainly contains an oxidation atmosphere, harmful components such as organic matters, residual carbon andsulfur in the coal gangue can be removed at a high temperature, and the cementing property, the freezing resistance and the durability of cement are protected from adverse influence of the harmful components.
Owner:CENT SOUTH UNIV
Shotcrete springback inhibitor and using method thereof
The invention discloses a shotcrete springback inhibitor and a using method thereof. The springback inhibitor is prepared by mixing the following raw materials: 50%-60% of a composite admixture, 15%-30% of nano calcium silicate, 15%-25% of an efficient water reducing agent, 1%-5% of redispersible latex powder, 1%-5% of a water retaining agent, 1%-5% of a thickening agent and 0.5%-1.0% of an exciting agent. When shotcrete is prepared, cement, sand, stone and the springback inhibitor are added into a stirrer together to be stirred; the mixing amount of the springback inhibitor is 3-8% of the total consumption of the cementing material. According to the shotcrete springback inhibitor and the using method thereof of the invention, under the condition that a water reducing agent is not added and the mixing amount of an accelerator is reduced, the springback rate of the shotcrete is greatly reduced, the working performance of the shotcrete is improved, meanwhile, the mechanical property andthe durability are improved. The method is particularly suitable for preparing the high-performance shotcrete. The one-time spraying thickness of the shotcrete can reach 50 cm or above, the early strength of the shotcrete is remarkably improved, the adverse effects of the accelerator on the strength, durability and the like of the shotcrete are avoided, the construction efficiency is improved, andthe engineering cost is saved.
Owner:刘翠芬
Composite concrete material and preparation method thereof
The invention discloses a composite concrete material belonging to the technical field of preparation of road materials and a preparation method of the composite concrete material. The composite concrete material is prepared by compounding a high void ratio epoxy resin gravel mixture with high fluidity polymer modified cement mortar; a specific compounding mode is to fill internal pores of the high void ratio epoxy resin gravel mixture with the high fluidity polymer modified cement mortar; a dense composite structure is formed by consolidating the high fluidity polymer modified cement mortar and the high void ratio epoxy resin gravel mixture. The preparation method comprises the following steps: firstly, preparing the high void ratio epoxy resin gravel mixture; secondly, pouring the high fluidity polymer modified cement mortar; thirdly, curing concrete. Compared with the prior art, the composite concrete material disclosed by the invention has the advantages of high comprehensive performance, good stability and durability, high price performance cost ratio, convenience in construction, long construction period and the like; the composite concrete material is more suitable for semi-flexible pavement paving engineering.
Owner:SHANXI PROVINCIAL RES INST OF COMM
High-pressure circulation grouting minitype steel pipe pile and construction method thereof
The invention discloses a high-pressure circulation grouting minitype steel pipe pile and a construction method thereof. The minitype steel pipe pile comprises a minitype steel pipe, a cement static slurry filling body, a cement static slurry protective layer and leakproof lag piles. The construction method comprises the following steps: (1) carrying out geological survey; (2) designing the minitype steel pipe pile; (3) formulating a scheme; (4) carrying out rotary jet grouting treatment on a slurry leaking layer; (5) carrying out pipe-following drilling; and (6) pouring the cement static slurry filling body and the cement static slurry protective layer, wherein the leakproof lag piles are applied to engineering of an underground soil body with the slurry leaking layer. According to the invention, advantages of the minitype steel pipe and cement static slurry are combined, and the high-pressure circulation grouting technology is adopted to form the cement static slurry filling body andthe cement static slurry protective layer on the internal and external parts of the minitype steel pipe, so that problems about pipe-holding and jamming of a drilling tool caused during the forming process of the minitype steel pipe pile are solved, and corrosion resistance of the minitype steel pipe pile and frictional resistance between the soil bodies are improved; and in addition, the leakproof lag pile technology better solves the problems about slurry leakage during pipe-following drilling and the pile forming and grouting processes.
Owner:LANZHOU UNIVERSITY OF TECHNOLOGY
Blast-furnace slag powder and blast-furnace slag and coal cinder compound powder excitant
A trigger for stimulating the early-phase activity of the blast furnace slag powder or the mixture of blast furnace slag powder and cinder powder is proportionally prepared from triethanolamine and early strengthening agent (calcined gypsum or bihydrated gypsum or potassium chromium sulfate).
Owner:SOUTH CHINA UNIV OF TECH
C30 regenerated aggregate concrete and preparation method thereof
InactiveCN110937865APromote environmental protectionPromote \"greening\"Solid waste managementCompressive resistanceRed mud
The invention discloses a C30 regenerated aggregate concrete and a preparation method thereof. The C30 regenerated aggregate concrete includes the following components: cement, mineral powder, fly ash, sand, cobble, water, an additive, and regenerated aggregate comprising activated iron tailing and waste slurry by the mass ratio of 1:0.3-0.6. The activated iron tailing is prepared through steps of: 1) drying iron tailing sand and red mud at 100-110 DEG C for 2-2.5 h; 2) adding sodium silicate and diatomite to the iron tailing sand and red mud, wet-milling the mixture for 10-20 min, drying themixture, calcining the mixture at 600-700 DEG C for 1-2 h, dry-milling the mixture for 10-15 min, and screening the mixture through a 200-mesh sieve to prepare the activated iron tailing. The C30 regenerated aggregate concrete is high in compressive strength, can reduce environmental pollution of the iron tailing and concrete waste slurry, saves resources and protects environment.
Owner:青岛汇鑫混凝土有限公司
Retarder for magnesium phosphate cement and use method thereof
The invention discloses a retarder for magnesium phosphate cement and a use method of the retarder. The retarder for the magnesium phosphate cement is prepared from the following materials in parts by weight: 23 to 48 parts of borax, 27 to 38 parts of magnesium sulfate heptahydrate and 1 to 6 parts of sodium acetate trihydrate. According to the invention, multiple retarding technologies are combined for use, a retarding effect is obvious, and the retarding effect is easy to adjust and controllable; the retarder is simple and practical, additional facility or measure cost is not increased, and construction management difficulty is not increased; safety and reliability are achieved, ions (such as chloride ions) harmful to a concrete matrix are not introduced, and structural strength and durability are not affected; and the retarder is high in applicability, can be introduced into magnesium phosphate cement paste, magnesium phosphate mortar and magnesium phosphate concrete for use, and is stable in effect.
Owner:XIYUEFA INT ENVIRONMENTAL PROTECTION NEW MATERIALS CO LTD
Quick-setting cement-based capillary crystalline waterproof material and preparation method thereof
The invention discloses a quick-setting cement-based capillary crystalline waterproof material and a preparation method thereof. The quick-setting cement-based capillary crystalline waterproof material comprises the following raw materials in parts by mass: 20 to 30 parts of sulphate aluminium cement with the particle size of 20 to 35 [mu] m, 10 to 15 parts of sulphate aluminium cement with the particle size of 3 to 10 [mu] m, 25 to 40 parts of quartz sand with the particle size of 40-80 [mu] m, 15 to 20 parts of quartz sand with the particle size of 10-30 [mu] m, 8 to 12 parts of an active master batch, 3-7 parts of a crystal nucleus type early strength agent, 0.5-2.5 parts of a polycarboxylate superplasticizer, 0.4-0.7 part of hydroxyethyl methyl cellulose and 1-2 parts of redispersiblelatex powder; wherein the active master batch is prepared from the following components in percentage by mass: 10 to 15 percent of potassium fluoride, 10 to 15 percent of tetrasodium aminotrimethylenephosphonate, 20 to 25 percent of sodium phosphate, 10 to 15 percent of sodium oxalate, 10 to 15 percent of magnesium sulfate and the balance of sodium silicate. The quick-setting cement-based capillary crystalline waterproof material can be rapidly hydrated during construction at the temperature of 0-10 DEG C, final setting is completed within 20 hours, the early strength is improved, and the repeated anti-seepage crystallization and repeated repairing effects are achieved.
Owner:ANHUI LENCAQI BUILDING MATERIAL
Chlorine ion curing agent for reinforced concrete and preparation method and applications thereof
The invention belongs to the technical field of chlorine ion curing agents, and especially relates to a chlorine ion curing agent for reinforced concrete and a preparation method and applications thereof. The curing agent is metal dihydroxide with a layered structure, has a micro-nano level granular shape, and is prepared by compounding 50 to 80 parts by weight of CaFe-NO3LDHs and 20 to 50 parts by weight of CaFeAl-NO3LDHs. The prepared chlorine ion curing agent does not damage a cement based material, and can stably and efficiently adsorb chlorine ions in a simulated concrete hole solution. In a cement paste sample, which has been soaked in a sodium chloride solution (3.5%), the corrosive performance of chlorine ions is obviously reduced, the effect is excellent, and the provided chlorineion curing agent is efficient and stable.
Owner:UNIV OF JINAN
Method for preparing polyether modified polycarboxylic acid grinding aid
The invention discloses a method for preparing a polyether modified polycarboxylic acid grinding aid. The method is characterized by comprising the following steps: preparing solutions from methyl allyl alcohol polyoxyethylene ether, crylic acid and vinyl acetate in a mole ratio of (1-5):(1-4):(0.1-0.3), and an initiator which accounts for 0.5-1.6% of the total mass and a chain transferring agent which accounts for 0.1-0.5 of the total mass; feeding the methyl allyl alcohol polyoxyethylene ether solution and the chain transferring agent into a reactor, mixing crylic acid and vinyl acetate, putting the mixture into a first constant-pressure liquid dropping device, and putting the initiator solution into a second constant-pressure liquid dropping device; and starting the constant-pressure liquid dropping device at 40-60 DEG C, completely dropping the liquid within 55-65 minutes, stirring to react for 30 minutes at 55-60 DEG C, heating to 85-90 DEG C to react for 10-30 minutes, cooling, and adjusting the pH value to be 7-8, thereby obtaining the polyether modified polycarboxylic acid grinding aid. The polyether modified polycarboxylic acid grinding aid is good in grinding aid and water reduction effect when used for producing universal silicate cement.
Owner:SOUTHWEAT UNIV OF SCI & TECH
Test method for evaluating asphalt consumption of asphalt mixture
InactiveCN110646598AAffects durabilityPrevent leakageWeighing by removing componentPreparing sample for investigationFiberYarn
A test method for evaluating asphalt consumption of the asphalt mixture is provided. The method comprises the following steps: S1, preparing a leak tester, a leak test cylinder, a glass plate, a smallasphalt mixture mixer, a hand shovel, a balance, and a cotton yarn test tool; S2, according to an asphalt viscosity temperature test, determining a mixing temperature to conduct a leak test; S3, in the leak test cylinder that is washed and dried, weighing the leak test cylinder m0 accurate to 0.01g, and putting the leak test cylinder m0 in a test box for a constant temperature, wherein the constant temperature time is not less than 2 hours; and S4, according to the mix ratio of the asphalt mixture that is actually used, mixing the mixture of the aggregate, the ore powder, the asphalt, the fiber stabilizer and the like by using the small asphalt mixture mixer according to the method of T7022, and during the mixing, adding a fiber stabilizer after the coarse and fine aggregates are added. According to the test method provided by the present invention, the amount of asphalt consumption in the asphalt mixture can be accurately and quantitatively evaluated, the influence of too little asphalt on the durability of the pavement can be avoided, and leakage and oil flooding caused by too much asphalt can be avoided.
Owner:CHINA FIRST HIGHWAY ENG
Stress safety judgment method for layered pouring concrete first-layer beam
ActiveCN111563344AEnsure safetyAffects durabilityGeometric CADDesign optimisation/simulationSocial benefitsElement analysis
The invention relates to the field of bridge and culvert engineering in the transportation industry, and particularly discloses a stress safety judgment method for a layered pouring concrete first-layer beam. Layered pouring concrete beams constructed by adopting a full framing are generally and reasonably poured layer by layer along the height of beams. Based on an elastic mechanics theory, the method comprises the following steps of deducing a stress function on the first-layer concrete beam when second-layer concrete is poured; determining the stress safety value of the first-layer concretebeam according to the compressive strength test value of the cubic concrete test blocks of the same batch of the first-layer concrete beam, thereby saving a large amount of time required by finite element analysis in the construction process; rapid judgment of stress safety, process simplicity and feasibility, the construction safety of the cast-in-place concrete beam of the bracket can be guaranteed; the risk that the durability of the bridge is affected by fracture or cracks of the concrete beam due to overlarge stress in the pouring process is avoided, the long-term service safety performance of the concrete beam is guaranteed, the later operation and maintenance funds are saved, and very remarkable economic and social benefits are achieved.
Owner:GUANGXI TRANSPORTATION SCI & TECH GRP CO LTD +1
Concrete pouring device for water conservancy project building and using method of concrete pouring device
ActiveCN112359835AEase of pouringUniform textureFoundation engineeringMobile vehicleArchitectural engineering
The invention discloses a concrete pouring device for a water conservancy project building and a using method of the concrete pouring device. A cabinet body is arranged on a mobile vehicle of the device, and a reversing pushing hand is arranged on one side of the cabinet body; a concrete secondary stirring mechanism comprises a slurry conveying pipe used for conveying concrete and a stirring unit,and stirring blades of the stirring unit are located between a slurry outlet and a slurry inlet of the slurry conveying pipe; a concrete vibrating mechanism comprises a lifting unit, a vibrating motor and a vibrating rod, the vibrating motor and the vibrating rod are arranged on the mounting seat, and an output shaft of the vibrating motor is connected with a rotating shaft in the vibrating rod;and the telescopic end of the lifting unit is connected with the mounting base. The method comprises the steps of making a conveying pipe of a concrete pump truck and the slurry conveying pipe communicate; moving the mobile vehicle to an operation point of the concrete to be poured; carrying out secondary stirring on the concrete and pouring the concrete; and carrying out vibration of concrete According to the concrete pouring device, concrete conveyed into an reinforcement cage can be uniform in texture, bubbles in the concrete can be removed in time, and the quality of a concrete structure is guaranteed.
Owner:杨玉庆
Concrete release agent and preparation method thereof
InactiveCN110157535AChange surface electrical propertiesLower potentialCeramic shaping apparatusLubricant compositionPolyvinyl alcoholActive agent
The invention discloses a concrete release agent and a preparation method thereof, and belongs to the field of building materials. A release active agent adopted in the preparation method is obtainedby taking cottonseed oil as a raw material and adding n-decanol and the like to carry out a reaction, carboxyl carried by the release active agent is subjected to a saponification reaction with a hydration product in concrete, meanwhile, surface hydrophobicity is increased by formed esteryl carboxylic acid with a long carbon chain structure, and the concrete potential is reduced, so that the concrete is well protected. According to a self-repairing additive adopted in the preparation method, gelatin and xanthan gum are bonded by polyvinyl alcohol to form a protective outer wall to inhibit corrosion to a release interface, and then durability of the concrete is influenced. A lubricating coating additive is adopted in the preparation method, epoxidized soybean oil and fluoropropyl-containingpolyhedral oligomeric silsesquioxane are polymerized, so that dust adhesion of a mold is reduced, and the de-molding effect is improved. The release active agent is added to improve flatness and a rust inhibitor is added for corrosion-preventing protection, so that use performance of the concrete is enhanced. According to the invention, the problem that an existing release agent is poor in mold release effect is solved.
Owner:谷银香
Horizontal embedded anchorage foundation
The invention relates to a horizontal embedded anchorage foundation and relates to the technical field of bridge engineering. The horizontal embedded anchorage foundation comprises an anchor body, anembedded wall, a buttress, a cable-stayed beam and an anchor chamber. As the embedded wall is arranged below the bottom surface of the anchor body and is horizontally embedded in bed rock, a larger part of anti-slip bearing capacity can be provided for the anchorage foundation; and compared with a gravity type anchorage foundation, the required anchor body weight is smaller when the same; in addition, a boss is arranged at the bottom of the anchor body to meet the requirement of an anchoring system for an anchoring space, and the situation that the foundation pit excavation amount is increaseddue to overall downward moving of the anchor body base surface can be avoided; and the bottom surface of the boss is arranged on the sea level or above the underground water level line, so that underground water can be prevented from immersing into the anchor body to influence the durability of the main cable anchoring system anchored in the anchor body boss. Therefore, the anchor foundation scale can be reduced, the material consumption can be reduced, the mountain excavation amount can be reduced, and the durability of a main cable anchoring system can be ensured.
Owner:CHINA MAJOR BRIDGE ENERGINEERING
Test method for evaluating asphalt consumption of asphalt mixture
InactiveCN111398572AAffects durabilityPrevent leakageWeighing by removing componentPreparing sample for investigationFiberSoil science
The invention discloses a test method for evaluating asphalt consumption of an asphalt mixture. The test method comprises the following steps: S1, preparing a precipitation and leakage tester, a precipitation and leakage test cylinder, a glass plate, a small asphalt mixture mixer, a hand shovel, a balance and a cotton yarn test tool; S2, determining a mixing temperature according to an asphalt equiviscous temperature test, and carrying out a precipitation and leakage test; S3, in a cleaned and dried precipitation and leakage test cylinder, weighing the precipitation and leakage test cylinder m0 accurately to 0.01 g, putting the precipitation and leakage test cylinder m0 into a test box, and keeping a constant temperature for not less than 2 hours; and S4, mixing aggregate, a mineral powder, asphalt, a fiber stabilizer and the like by using the small asphalt mixture mixer according to a T0702 method according to a mixing ratio of the actually used asphalt mixture, and adding the fiber stabilizer after a coarse aggregate and a fine aggregate are added during mixing. According to the test method, the asphalt consumption of the asphalt mixture can be accurately and quantitatively evaluated, durability of a pavement is prevented from being influenced by too small asphalt mixture consumption, and precipitation, leakage and bleeding caused by too large asphalt consumption are also avoided.
Owner:CHINA FIRST HIGHWAY ENG
Digital full-color pen connecting method for repairing ancient calligraphy and painting
InactiveCN111818238AOvercome difficultyOvercome the cycleArtistic surface treatmentInput/output processes for data processingComputer graphics (images)Color correction
The invention belongs to the technical field of cultural relic protection. The invention particularly discloses a digital full-color pen connecting method for repairing ancient calligraphy and painting. The method comprises the following steps: firstly, carrying out high-precision scanning on ancient calligraphy and painting before full color, then carrying out full-color pen connection on incomplete parts of the ancient calligraphy and painting in a computer by using digital painting software, then carrying out color correction on the whole process by using a color management system, and finally copying repaired works by using artistic micro-spraying equipment. The problems that original artistic styles of the ancient calligraphy and paintings are damaged due to the fact that no basis isprovided for pen connection during ancient calligraphy and painting restoration, and picture content cannot be comprehensively displayed during ancient calligraphy and painting exhibition due to the fact that pens cannot be connected are solved. The method is quick and safe to operate and high in reversibility, does not influence the strength, color, durability and other properties of the ancientpainting and calligraphy image layer, and conforms to the principle of minimum intervention of cultural relic protection.
Owner:XIAN TECHNOLOGICAL UNIV
A steel pipe arch bridge suspender preformed hole accurate positioning device
PendingCN109706845AAffects durabilityEasy to operateBridge erection/assemblyBridge engineeringArchitectural engineering
The invention discloses a steel pipe arch bridge suspender preformed hole accurate positioning device, and relates to the technical field of bridge engineering positioning devices. The steel pipe archbridge suspender preformed hole accurate positioning device comprises a steel wire rope that sequentially penetrates through an upper preformed through hole and a lower preformed through hole, wherein the upper preformed through hole is located in a steel pipe arch, the lower preformed through hole is located in a beam surface, two ends of the steel wire rope are arranged on a center shaft of theupper preformed through hole and a center shaft of the lower preformed through hole respectively, and the steel wire rope penetrates out of the lower preformed through hole and is connected with a tensioning part that keeps the steel wire rope in a tensioned state. The position of the preformed through hole can be corrected in the alignment process of an embedded pipe of the steel pipe arch and an embedded pipe of the beam surface, and the mounting precision and the mounting efficiency are improved.
Owner:中铁二十一局集团第五工程有限公司
A kind of modified biomass building wall material
ActiveCN113121189BIncrease productivityAvoid elasticAdditive manufacturing apparatusCellulosePhospholipase
The invention discloses a modified biomass building wall material, which comprises the following components by mass percentage: 28-70% of biomass material, 10-40% of cement, 10-30% of gypsum powder, and 10-30% of fine sand , lightweight aggregate 5‑20%, waterproof rubber powder 0.01‑0.04%, water reducing agent 0.01‑0.03%, waterproofing agent 0.02‑0.05%, methyl cellulose 0.005‑0.01%, plant phospholipase 0.03‑0.06%, wood 0.03‑0.06% of fiber, 0.01‑0.03% of polyvinylamide, and 0.02‑0.04% of biomass antifungal agent. In the present invention, all raw materials are put into the assembly line after being allocated in a reasonable proportion. The production process is completed in one go, and the production efficiency is high. In the production process The biomass material is modified first to avoid the problems of demoulding adhesion and rebound after demoulding, adding biological antifungal agent and water repellent, which will not affect the durability of the finished material due to the high specific gravity of the biomass material. Realized the same life as the building.
Owner:青岛霍林河新型建材有限公司
A kind of construction method of bridge expansion joint filling material
InactiveCN106968167BImprove bending and tensile performanceReduce dosageBridge structural detailsPolyvinyl alcoholExpansion joint
Owner:泰安市通达投资有限公司 +1
Inflation-free tire
PendingCN110744973AStable supportEnough durabilityNon-inflatable tyresHigh resiliency wheelsSupport plane
Owner:CHENG SHIN RUBBER XIAMEN IND
Method for quickly determining water content of particulate materials
ActiveCN101769843BImprove detection efficiencySimple methodMaterial weighingProcess engineeringEnvironmental engineering
The invention provides a method for quickly determining the water content of particulate materials, which comprises Standard of Quality and Testing Method of Normal Concrete Sand and Stone. The method comprises the following steps: firstly collecting samples of the particulate materials which are planed to be used on a construction site, then testing indoors to respectively determine the unit mass of a certain volume under the conditions of different water contents, drawing relevant standard curves by the calculation and the linear regression, directly weighting the mass of the wet-materials with the relevant volume by using the difference between the density of the particulate materials and the density of water and the relationship of the relevant standard curves, and obtaining the water content of the particulate materials to be tested by looking up the standard curves after a simple flask test and coversion, thereby quickly and effectively changing the theoretical mixing proportion which is selected indoors into the construction mixing proportion. The method has the advantages of simplicity, practicality, high testing speed, good effect, low cost, accurate test, wide application range, safety and environmental friendliness, and greatly improves the detection efficiency of the water content.
Owner:NO 2 ENG CO LTD OF CHINA RAILWAY CONSTR 11 BUREAU GRP +1
Test device for evaluating asphalt consumption of asphalt mixture
PendingCN111381015ALeakage test results are accurateReduce the influence of factors on manual loading of samplesWeighing by removing componentPreparing sample for investigationRoad surfaceMechanical engineering
Owner:CHINA FIRST HIGHWAY ENG CO LTD
High-pressure circulating grouting micro-steel pipe pile and its construction method
Owner:LANZHOU UNIVERSITY OF TECHNOLOGY
CPU (central processing unit) fan housing
InactiveCN103410781AAvoid contactDoes not affect heat dissipationPump componentsDigital data processing detailsForeign matterComputer engineering
The invention discloses a CPU (central processing unit) fan housing comprising a housing body and an upper cover connected to the housing body. The CPU fan housing is characterized in that the housing is partially cylindrical at least, the upper surface of the housing is provided with a blind hole extending in the height direction of the housing, the diameter of the blind hole is larger than the outside diameter of a fan, the upper cover is plate-shaped and covers the blind hole in the upper surface of the housing through a plurality of fasteners, the upper cover is also provided with a vertically through first through hole, and the diameter of the first through hole is smaller than the outside diameter of the fan. The fan is disposed in the blind hole inside the housing; after being rested on the blind hole, the upper cover is fastened to the blind hole through the fasteners; the first through hole is provided above the upper cover, and the radiating effect of the upper cover is unaffected; the CPU fan housing can effectively prevent foreign matters from contacting with the edge of the fan, and the fan is protected from scratches impairing the durability.
Owner:KUNSHAN WEIJIN HARDWARE PROD
Testing device for evaluating asphalt amount of asphalt mixture
InactiveCN110646597ALeakage test results are accurateReduce the influence of factors on manual loading of samplesWeighing by removing componentPreparing sample for investigationRoad surfaceAsphalt
The invention discloses a testing device for evaluating the asphalt amount of an asphalt mixture. The testing device comprises a drying box, wherein a rotating device is arranged on one side of the drying box; a rotating rod is connected to the rotating device; one end of the rotating rod penetrates through the side wall of the drying box and extends into the drying box; and one end of the rotating rod is detachably connected to a roller. Through the testing device, during a rotating process, excess asphalt binders, fine aggregates, mastic and the like in asphalt mixture samples can be in contact with the inner wall of a stirring barrel fully through continuous rotation, so that the influence of factors of manual loading of the samples is reduced, an asphalt drain-down test result is moreaccurate, and thus the size of the asphalt amount of the asphalt mixture is reduced more accurately, the influence of the too small amount of the asphalt mixture on the durability of the road surfaceis avoided, the drain-down and flooding caused by the too large asphalt amount are also avoided, and compared with traditional asphalt drain-down test equipment, the test result is more accurate, andthe effect is more obvious.
Owner:CHINA FIRST HIGHWAY ENG
Plain area highway abutment back structure, highway structure and construction method
PendingCN114318991AGet rid of the lag problemImprove construction progressArtificial islandsRoadwaysArchitectural engineeringStructural engineering
The invention relates to a plain area expressway abutment back structure, a highway structure and a construction method.The plain area expressway abutment back structure comprises a backfill structure and a structure located in the backfill structure, the section of the backfill structure is trapezoidal, the top face area of the backfill structure is smaller than the bottom face area of the backfill structure, the backfill structure comprises at least two retaining walls, and the retaining walls are arranged in the width direction of a highway; by adopting the abutment back structure disclosed by the invention, the construction speed is high, and the requirements of the abutment back of the expressway in the plain area are met.
Owner:SHANDONG TRAFFIC PLANNING DESIGN INST
Method and apparatus for firearm sound suppression
InactiveUS20170292805A1Muffled noiseReduces visible flashMuzzle attachmentUltrasound attenuationSuppressor
The method of the current invention provides means to maximize firearm suppressor efficiency with regards to maximizing sound attenuation while minimizing physical size and weight and minimizing firearm backpressure and manufacturing cost. In the preferred embodiment, the device consists of a closed cylinder within which is a separate closed inner cylinder of a lesser diameter and length. Holes coaxial with the assembly provide a means to attach the device to the firearm muzzle at the proximal planar end of the device, for the projectile and ejection mass to enter the proximal end of the inner cylinder and for the projectile and ejection mass to exit the device at the distal end of the device.
Owner:COUVILLION ROY JOSEPH
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