335 results about "Stone dust" patented technology

The invention discloses a preparation process and application of a modified anti-segregation admixture for machine-made sand, and relates to the technical field of polymer modified materials. Modified polyoxyethylene ether and vinyltrimethoxysilane are adopted to construct a steric hindrance effect, styrene-acrylate emulsion is introduced to form an interpenetrating network structure, and nano silicon dioxide and bentonite are cooperated to construct a multi-scale enhancement system. Silane coupling agent hydrolysis and nano grafting reaction are realized through gradient heating, and the particle size distribution D90 of the emulsion is less than or equal to 5 microns by combining an ultrasonic-mechanical synergistic emulsification process. A three-dimensional network is formed by the composite thickening agent and anhydrous sodium sulfate, and after in-situ curing at 25 DEG C with RH greater than or equal to 80%, 0.1-0.5% of the additive is added, so that the slump retention value of the machine-made sand concrete is greater than 315mm (1h), the pressure bleeding rate is less than or equal to 9.7%, the 28d compressive strength is improved by 24.5-72.6 MPa, and the segregation resistance coefficient is reduced to 0.08-0.11. The technology breaks through the limitation of insufficient adaptability of traditional admixtures to machine-made sand, and is particularly suitable for long-distance pumping construction of high-stone-powder-content machine-made sand concrete.

The utility model relates to an efficient and environment-friendly machine-made fine sand production system which comprises a bar type feeder, a screen feed opening of the bar type feeder is connected to a linear vibrating screen I, and a screen feed opening of the bar type feeder is connected to a jaw crusher; a feed opening of the jaw crusher and an oversize feed opening of the linear vibrating screen I are connected to the intermediate crushing cone crusher, and a feed opening of the intermediate crushing cone crusher is connected to the linear vibrating screen II; screen discharge ports of the linear vibrating screen I and the linear vibrating screen II are connected to a trough type sand washer, a clean sand outlet of the trough type sand washer is connected to a rod mill, and a discharge port of the rod mill is connected to a high-frequency dewatering screen. A slurry outlet of the groove type sand washer and a slurry opening of the high-frequency dewatering screen are sequentially connected to a high-efficiency thickener and a plate-and-frame filter press. The dry-wet combined sand making process system is high in sand forming rate, quality indexes such as mud content, water content, grading and stone powder content of finished product sand can be well controlled in the sand making process, and the quality of finished product machine-made fine sand is improved.

The invention discloses composite paste slurry suitable for pretreatment of a pier pile foundation in a karst area and a preparation method and a grouting method of the composite paste slurry, the composite paste slurry is based on the filling design of part of a karst cave but not the whole karst cave, cement, slurry, stone powder and a composite additive are prepared into semi-solid slurry with the slump of 5-10 cm, and the composite paste slurry has underwater anti-dispersion performance, the composite admixture is composed of a first admixture and a second admixture in a mass ratio of 1: 1; each cubic meter of the composite paste slurry comprises the following components by mass: 200 to 300 kg of cement, 550 to 780 kg of slurry and 820 to 1200 kg of stone powder, and the addition amount of the first additive and the second additive is 0.6 to 1% of the weight of the cement. The problems that when an existing pretreatment grouting technology is used for treating the karst problem of the bridge pier, the number of drilled holes is large, the reinforcing effect is common, cost is high, the environment is polluted, and adaptability to complex geology is insufficient are solved.

The invention relates to the field of concrete design, and particularly discloses stone powder-containing machine-made sand concrete and a corresponding mix proportion design method. The method comprises the steps that the use amount of coarse aggregate, fine aggregate and a cementing material of concrete is calculated, the fine aggregate stone powder-containing machine-made sand is subjected to rapid screening, the stone powder content of the fine aggregate stone powder-containing machine-made sand is measured, all the stone powder-containing machine-made sand is counted into the cementing material, part of cement, fly ash and mineral powder are replaced, a cementing system is formed, 10%-20% of the cement is replaced with the cement, and the remaining part of the cement is replaced with the fly ash and the mineral powder; calculating a strength influence coefficient under the specific cement replacement ratio of the stone powder by adopting a formula gamma Lf =-3.16 x-0. 048 x + 1, and calculating the mortar strength of the gelling system according to the strength influence coefficient; and adjusting and determining the water consumption meeting the preparation strength requirement, and finally determining the dosage of each component of the concrete. The stone powder in the powder-containing machine-made sand serves as a gelling component, efficient resource utilization of the machine-made sand with the high stone powder content is achieved, the use amount of cement and coal ash is reduced, and the problem that concrete is not low in carbon for a long time is solved.

The utility model relates to a production line for preparing machine-made sand by using construction waste, which comprises a raw material crushing system, a screening system and a sand making system, and the raw material crushing system sequentially comprises a plate chain feeder, a jaw crusher and an impact crusher; the screening system comprises a first vibrating screen and a second vibrating screen, raw materials crushed by the impact crusher are conveyed to the first vibrating screen, the first vibrating screen is connected with a first aggregate bin and the second vibrating screen, and the second vibrating screen is connected with different second aggregate bins; the sand making system sequentially comprises a shaping sand making machine, a third vibrating screen and a powder selecting system, the shaping sand making machine is respectively connected with the first aggregate bin and the second aggregate bin, finished product machine-made sand and stone powder are selected through the powder selecting system, and the stone powder is conveyed to the powder bin.

The invention discloses a mine high and steep slope ecological restoration integrated system based on double-response gel and an ecological restoration method. The system comprises a three-channel rotational flow mixing bin, a pulse atomization spraying device and an AI visual control system, gradient spraying of erosion-resistant, nutrition and water-retention three-level matrixes is achieved, pulse atomization and YOLO-v8 driven crack recognition are matched, and the problem of'jet flow attenuation 'of a slope with the angle being 70 degrees or above in a traditional process is solved. The method comprises the following steps: preparing a pH-temperature double-response sodium alginate-chitosan gel seed bag, spraying according to a sequence of 10-15cm of a water retention layer, 20-40cm of a nutrition layer and 10-20cm of an anti-erosion layer, and performing multispectral inspection by using an unmanned aerial vehicle to realize dynamic maintenance. The matrix system takes stone powder porous particles, activated fly ash and other solid wastes as raw materials, the resource utilization rate of mine solid wastes is effectively improved, and the matrix system is suitable for repairing complex slopes in coastal areas, volcanic rocks, cold areas and the like.

The invention relates to the technical field of asphalt concrete production, in particular to a bag-type dust remover for stone dust recycling, which comprises a dust removal bin, a pattern plate is fixedly mounted on the upper side in the dust removal bin, a plurality of mounting holes are formed in the pattern plate, dust removal bags and a bag cage are mounted in the mounting holes, and an air outlet cylinder is rotatably mounted in the bag cage. A plurality of expansion units which are uniformly arranged up and down are mounted on the outer side of the air outlet cylinder, expansion rings are mounted on the expansion units, and the expansion rings are fixedly connected with the cloth bag cage; through radial expansion and retraction of the expansion ring, a hardened layer on the surface of the filter bag can be effectively broken, meanwhile, the subsequent pulse back-blowing dust removal effect is improved, and the dust recovery efficiency is ensured; when the dust collection bag is locally damaged, the dust collection bag can prevent dust-containing air flow from flowing out through the air outlet cylinder, so that the dust collection bag can still maintain a normal filtering function in other areas except the damaged position, thereby reducing environmental pollution and ensuring the dust collection efficiency.

The invention belongs to the technical field of building materials, and provides a baking-free brick and a production process thereof, the baking-free brick comprises the following raw materials: 58-62% of industrial waste residue, 2.5-3.5% of stone nitrate, 8-10% of cement, 2.8-3.5% of quick lime, 0.15-0.25% of ash powder, 0.18-0.22% of JFS activator, and the balance of water; industrial solid waste resources are effectively utilized, energy consumption and production cost are reduced, exciting agent ions are promoted to diffuse to stone powder lattice defect sites through the steam heat effect, a nano water film enhances solid-liquid interface ion exchange, the material reaction activity index is remarkably increased, high-temperature sintering is not needed, and the requirement for green building material development is met; the environmental pollution is reduced.

The invention relates to the technical field of sintered ore production, in particular to a sintering mixture and a preparation method thereof.According to the method, a large proportion of iron-containing dust sludge is adopted as a raw material to prepare the sintering mixture, and the sintering mixture comprises mixed iron-containing dust sludge, iron ore concentrate, fine ore, coke powder, magnesite powder and slaked lime powder; the mixed type iron-containing dust mud comprises blast furnace gas mud, converter mud and sintering machine tail dedusting ash, and the weight percentage content of the blast furnace gas mud, the converter mud and the sintering machine tail dedusting ash is 20%-25%: 8%-15%: 65%-70%. The method has the beneficial effects that the problems that the sintering mixture is poor in strength and unreasonable in particle size composition due to the fact that the iron-containing dust mud is directly used as the raw material for preparing the sintering mixture, and the yield and quality of sintered ore are deteriorated are solved.

The invention discloses a technical method of a lean magnetite dry-discarded tailing recleaning recovery process, and relates to the technical field of iron ore recovery. The technical method of the lean magnetite dry-discarded tailing recleaning and recycling process is characterized by comprising the following specific operations: S1, stacking coarse tailings at one place; s2, adding the coarse tailings obtained in the step S1 into a vertical shaft crusher; s3, the materials obtained in the step S2 are added into a double-layer efficient fine powder sieve, then the materials with the particle size being 0-6 mm serve as stone powder to be subjected to the step S4, the materials with the particle size being 6-16 mm serve as melon seed slices to be subjected to the step S5, the materials with the particle size being larger than 30 mm serve as medium four stones to be subjected to the step S6, and if other materials exist, the materials with the particle size being larger than 30 mm serve as medium four stones to be subjected to the step S6. According to the lean magnetite dry-discarded tailing recleaning and recycling process technical method, existing coarse tailing (0-30 mm) building material products are subdivided, and the standard of mainstream building material products in the market is met; and fine-fraction (0-6 mm) fine ore resources in the coarse tailings are subjected to re-separation and recovery, so that the metal loss is reduced, and the metal recovery rate is increased.

The invention relates to the technical field of building materials, in particular to flow-state solidified soil as well as a preparation method and application thereof. The flow-state solidified soil comprises the following components in percentage by mass: 50%-60% of muck, 35%-40% of water and 5%-13% of a curing agent, wherein the curing agent is prepared from the following components in parts by weight: 5 to 25 parts of cement clinker, 25 to 50 parts of superfine slag powder, 10 to 25 parts of fly ash, 10 to 20 parts of waste gypsum, 10 to 20 parts of mountain flour slag, 1 to 3 parts of anti-dispersing agent and 1 to 5 parts of water reducing agent. According to the invention, the defect that the plugging effect is poor when cement paste is used as a drilling hole exploration plugging agent at present can be improved.

The invention belongs to the technical field of civil engineering materials, and particularly relates to stone powder and nano material synergistically modified bubble light soil and a preparation method thereof. The light soil comprises the following raw materials: cement, stone powder, water, a foaming agent, a composite alkali activator consisting of NaOH and water glass, and a hydrophilic / hydrophobic nano SiO foam stabilizer. The preparation method comprises the step of mixing, pouring and curing the alkali-activated slurry and the nano stable foam. According to the invention, stone powder activity and foam stability can be synergistically improved, high mixing amount (up to 30%) of stone powder is realized, and low density, high strength and high environmental protection benefit are achieved at the same time.

The application is a kind of stone powder sorting system, including feeding equipment, feeding equipment is feeding for slurry preparation equipment, the stone block outlet of slurry preparation equipment is transported to the temporary storage yard through the belt conveyor, the first screening equipment is connected with the ore slurry liquid outlet, the sand outlet of the first screening equipment is connected with the first spiral dewatering equipment, the first spiral dewatering equipment is provided with the discharge port and the tailing slurry liquid outlet, the discharge port is discharged as building sand, the ore slurry liquid outlet of the first screening equipment is connected with the primary cyclone sorting equipment, the overflow outlet of the primary cyclone sorting equipment is connected with the secondary cyclone sorting equipment, the underflow outlet of the secondary cyclone sorting equipment is connected with the primary dynamic static separation equipment, the tailing slurry liquid outlet of the primary dynamic static separation equipment is connected with the four-stage concentration equipment, the concentrated ore slurry outlet of the four-stage concentration equipment is connected with the four-stage dewatering equipment, the application can perform ladder classification screening on the stone powder, the whole system is closed loop connection, and the dust pollution to the environment is avoided.

The application relates to an aerated concrete prepared from granite waste rock powder and a preparation method thereof. The aerated concrete of the application takes granite waste rock powder (skeleton effect), calcium carbide slag (calcic material), clay (sintering promotion), red mud (gel filling) and coal gangue (siliceous material) as core raw materials, replaces traditional natural sandstone and lime, realizes industrial solid waste resource utilization, conforms to the development direction of green building materials, and significantly reduces the dependence on natural resources.

The application relates to a natural stone powder finishing construction process, which comprises the following steps: step one, material arrival inspection; step two, base layer pretreatment; step three, after the base layer treatment is completed, an alkali-resistant sealing liquid is sprayed to seal the bottom; step four, base coarse aggregate layer construction: a first coarse aggregate layer is scraped to form a base and an alkali-resistant grid cloth is attached, after the base is solidified and dried, a cake is attached to form a reinforcing rib, and a second coarse aggregate layer is sprayed and leveled by using a spraying machine; step five, middle coating layer construction: after the second coarse aggregate layer is solidified and dried, a first middle coating layer is scraped, vertical scraping and gradual leveling are carried out, after the first middle coating layer is solidified and dried, a second middle coating layer is scraped horizontally and is precisely leveled; and step six, surface coating layer construction: the surface coating layer is scraped vertically, and light is collected before the surface coating layer is initially solidified and hardened. Compared with a traditional construction method, the construction process is more suitable for natural stone powder construction, and is simple, convenient and environment-friendly.

The application discloses a concrete production method, comprising the following steps: step 1, determining the quantity of materials needed to be added to ordinary concrete according to the required compressive strength of the roller compacted concrete; step 2, sequentially adding the required materials into the ordinary concrete and performing roller compacting mixing in the concrete; step 3, adding an admixture into the concrete obtained in step 2 through a low-temperature high-pressure spraying mixing mode; and step 4, adding asphalt into the concrete obtained in step 3 and uniformly mixing to obtain the roller compacted concrete. Further, the materials comprise stone powder, fly ash and pozzolanic admixture. The application increases the hardness and compressive strength of the ordinary concrete through material adding and process treatment, so that the roller compacted concrete can be produced on site when the demand is small, and factory ordering is not needed, thereby saving the construction cost.

The invention discloses concrete, which is prepared from the following raw materials in parts by weight: 230 to 250 parts of cement, 100 to 110 parts of slag powder, 60 to 65 parts of fly ash, 400 to 420 parts of washed sand, 220 to 240 parts of stone powder, 265 to 280 parts of fine sand, 770 to 800 parts of stone with the particle size of 10 to 20 mm, 190 to 200 parts of stone with the particle size of 5 to 10 mm, 95 to 100 parts of mixing water and 7 to 10 parts of additives. Through reasonable proportioning of concrete raw materials, the problems of segregation, bleeding and the like caused by unreasonable proportioning in the past are avoided, and the strength and durability of the concrete are greatly improved, so that the maintenance and replacement cost of a project is reduced, the safety of the project is improved, and the service life of the project is prolonged.

The invention belongs to the technical field of building materials. The invention provides a stone powder-based stone-like material. The stone powder-based stone-like material comprises a stone powder-based stone-like green body and a stone curing layer arranged on the surface of the green body, the stone powder-based stone-like green body comprises a core stone powder base material, functional mineral powder, a bonding modification system, a water reducing agent, water and a decorative aggregate; wherein the components in parts by mass are as follows: 50-70 parts of the core stone powder base material, 8-12 parts of the functional mineral powder, 12-15 parts of the bonding modification system and 0-1 part of the decorative aggregate; the water reducing agent accounts for 1-2% of the total mass of the core stone powder base material, the functional mineral powder and the bonding modification system, and the water accounts for 8-12% of the total mass of the core stone powder base material, the functional mineral powder and the bonding modification system. The stone powder-based stone-like material is based on metamorphic rock mineral raw materials and can simulate the characteristics of natural rock materials, so that the prepared material is remarkably superior to an existing stone-like material in the aspects of texture level, structural compactness and overall stone-like effect; and moreover, the solid waste utilization rate is high, and the process adaptability is high.

The present invention relates to the field of production feeding equipment, and particularly to a calcium oxide production feeding equipment and process based on the regeneration of waste stone powder, including a roller hearth kiln. The roller hearth kiln includes a kiln furnace. Inside the lower part of the kiln furnace, there is a roller rack. On both sides of the upper part of the roller rack, there are docking ports. On both sides inside the roller rack, uniformly distributed fixed guide rods are installed. The inlet end of the roller hearth kiln is connected to a feeding conveyor rack, and the outlet end of the roller hearth kiln is connected to a discharging conveyor rack. On the upper parts of the roller rack, the feeding conveyor rack and the discharging conveyor rack, there are trays. In the middle of both ends of each tray, there are fixed columns fixedly connected. At the ends of the fixed columns, there are bayonets. The present invention can effectively reduce the cost input by using marble waste as a preparation raw material, and can reduce the equipment cost input and site cost input by leasing the tile baking kiln of an idle tile factory. At the same time, the modification of the original roller hearth kiln is extremely small, which is beneficial to actual use.

The utility model relates to the technical field of stone dust removal equipment, in particular to mine stone dust removal equipment which comprises a cleaning pool, machine shells are arranged on the left side and the right side of the top end of the cleaning pool respectively, a lifting assembly is arranged in an inner cavity of each machine shell, and supports are arranged on the sides, close to each other, of the two lifting assemblies. A storage frame is arranged at the bottom ends of the two supports, a through hole is formed in the bottom end of the storage frame, the storage frame inclines by 30 degrees from back to front, and a flushing assembly is arranged at the bottom end of an inner cavity of the cleaning pool. According to the mine stone dust removal equipment, stones are conveyed to the inner cavity of the cleaning pool through the conveying line, dust and soil on the surfaces of the stones can be thoroughly cleaned through the cleaning assembly, then the outer walls of the stones are kept clean, and the problems that in the prior art, stone dust removal equipment is not thorough in dust removal in the actual use process, and the dust removal efficiency is high are solved. The dust can only be temporarily settled, and the dust on the surface of the stone still drifts away after the water is evaporated.

The application discloses a kind of weathered marble waste stone powder resource utilization composition and application thereof, belong to environmental protection technical field.The weathered marble waste stone powder resource utilization composition includes marble waste stone powder, soil and microalgae biological fertilizer SynMiCom.The application mixes soil in marble waste stone powder and then adds SynMiCom, which can significantly reduce the pH of marble waste stone powder, significantly increase the content of reduced nitrogen in marble waste stone powder, significantly increase the content of available phosphorus in marble waste stone powder, significantly increase the enzyme activity in marble waste stone powder, and significantly promote the growth of peppers in marble waste stone powder.The application utilizes the long-term weathered marble waste stone powder, which has low cost and high application value.

The invention discloses a construction method for a deep foundation pit large-slope toe supporting structure. The construction method comprises the steps that positioning and paying off are conducted on the bottom of a large-slope, and a steel sheet pile sideline needing to be driven is measured and laid; piling a steel sheet pile at the bottom of the pit: piling the steel sheet pile according to the measured and released steel sheet pile sideline; constructing a brick blank film and a foundation slab structure; outer wall internal corner waterproof and waterproof protection layers are constructed, stone powder is backfilled, and C15 plain concrete is poured; a basement structure is constructed, waterproof and protective layer building is conducted on a basement outer wall, after building is completed, a basement outer frame is dismantled, at the moment, construction of a steel sheet pile supporting structure is completed, and the steel sheet pile supporting structure is formed; and the steel sheet piles are pulled out, and construction of the deep foundation pit large slope toe supporting structure is completed. The method is simple and easy to implement, the problem that the deep foundation pit bearing platform conflicts with the foundation pit supporting slope is solved, the safety of basement structure construction and foundation pit supporting is guaranteed, the basement structure construction progress is guaranteed, the construction period is shortened, disposable materials are prevented from being put into use, and the purpose of improving benefits is achieved.

The invention relates to the technical field of printing ink curing coatings, and discloses a preparation method of an external wall stone-imitating thermal insulation coating. The coating is prepared from the following components in parts by mass: 30 to 50 parts of acrylic emulsion, 8 to 20 parts of glass powder, 5 to 15 parts of ceramic powder, 15 to 30 parts of natural stone powder, 10 to 25 parts of sand grains, 0.3 to 1.2 parts of thickening agent, 0.5 to 1.5 parts of wetting dispersant, 1.5 to 3.5 parts of coalescing agent, 1 to 5 parts of mildew-proof weather-proof agent and 50 to 80 parts of water. By adding the glass powder, the ceramic powder and other components, a microcosmic heat insulation layer is formed in the coating, heat conduction is effectively reduced, energy consumption of a building is reduced, and a good heat insulation effect is achieved. The mildew-proof and weather-proof agent is a brand new compound, and long-acting bacteriostasis is realized by destroying cell walls of mildew or interfering a metabolic enzyme system of the mildew. The mildew-proof coating has high stability in a humid environment, is not easy to decompose, and can provide lasting mildew-proof protection for buildings.

The application discloses a kind of adsorptive control materials for tunnel hole slag stone powder and application.The adsorptive control material is mixed by surface active component, complex component, anti-mud component three components according to 3-7:1:0.5-5 mass ratio;The surface active component is one or more of dodecyltrimethylammonium chloride, dodecyl dimethyl benzyl ammonium chloride, didodecyltrimethylammonium chloride;The complex component is one or more of sodium silicate, sodium hexametaphosphate;The anti-mud component is one or more of polyethylene glycol, β-cyclodextrin, dimethyl diallyl ammonium chloride.The adsorptive control material can improve the adsorption of tunnel hole slag stone powder, ensure the working performance of concrete.

The invention relates to the technical field of material conveying, in particular to a silo material loading structure which comprises a supporting table, a material conveyor and a material guiding unit. The material conveyor is mounted on the supporting table; the material guide unit is provided with an input end and an output end, the input end is connected with the material conveyor, and the output end extends into the boxcar; the material guide table is configured to be capable of being switched between a first operation state and a second operation state; dust suppression liquid is stored in the material guide table, and the driving mechanism is configured to drive the material guide table to be converted from the first operation state to the second operation state and synchronously trigger the dust suppression liquid in the material guide table to be pressurized and sprayed out; the problems that operation is troublesome due to the fact that a truck needs to be moved frequently when an existing truck loading structure adopts a fixed-dip-angle material guiding belt for truck loading, and the dust suppression effect is poor due to the fact that dust suppression liquid cannot make rapid contact with stone powder at the bottom of the material guiding belt are solved.

The application discloses a dry discharge dehydration system and method for efficiently recycling fine sand and stone powder fine particles by gravity precipitation, which comprises a groove belt type fine sand recycling system and a shower type tail slurry distribution system arranged at the upper portion of the groove belt type fine sand recycling system; the groove belt type fine sand recycling system is divided into a fine sand water control dry discharge section, a fine sand precipitation recycling section and a sewage discharge section along the running direction of the groove belt type fine sand recycling system; the fine sand water control dry discharge section, the fine sand precipitation recycling section and the sewage discharge section are connected into an integrated whole by an annular conveying groove belt; the slurry is in the form of water droplets and does not have impact force by the thickness of at least 3 layers of punching plates, so that the slurry can better complete precipitation and will not scour the precipitation layer; the application utilizes the principle that particles in sewage will be affected by gravity and flow rate to produce precipitation, realizes efficient recycling of fine particles and ultra-fine particles, and solves the technical problem that materials below the sieve hole diameter of a screening device are difficult to recycle.

The invention discloses a comprehensive evaluation method for the quality of granite stone powder. The method comprises the following steps: acquiring particle size distribution characteristic parameters of the granite stone powder; obtaining the fluidity ratio F of the granite stone powder; obtaining the activity index of the granite stone powder; and establishing a comprehensive quality evaluation calculation model containing the particle size distribution characteristics, the fluidity ratio and the activity index, and calculating the comprehensive quality index based on the particle size distribution characteristic parameters, the fluidity ratio and the activity index of the granite stone powder. The invention further discloses a granite stone powder quality comprehensive evaluation system. The method has the beneficial effects that the three core dimensions for representing physical and chemical performance coupling of the granite stone powder are combined, a multi-dimensional comprehensive evaluation calculation model is constructed, a single comprehensive quality index with clear physical significance is output, complex performance representation is converted into a visual and quantifiable quality grading standard, and the quality of the granite stone powder is effectively evaluated. The comprehensive and systematic characterization of the granite stone powder quality is realized, and the problem of one-sided evaluation in the prior art is solved.

The invention discloses a machine-made sandstone powder content automatic detection device, and belongs to the technical field of machine-made sand detection.The machine-made sandstone powder content automatic detection device comprises a tank body and a screening box, a plurality of telescopic rods are fixedly connected between the screening box and the tank body, the telescopic rods are sleeved with third springs, and a partition plate is fixedly connected into the tank body; a detection cylinder, a base and a placement block are arranged below the partition plate; and by arranging the screening box and the baffle, the proportion of coarse sand, medium sand and fine sand entering the tank body is precisely controlled. A material mixing plate arranged in the tank body is responsible for uniformly mixing the machine-made sand, part of mixed finished products are sent into a detection cylinder for detection, at the moment, a stirring rod and a dipping rod are sequentially driven to move, the machine-made sand in the detection cylinder is stirred and detected, the quality of the machine-made sand in the grading process is directly monitored, and if it is detected that the content of stone powder in the machine-made sand does not reach the standard, the machine-made sand is qualified. And the mixing amount of the fine sand can be immediately controlled by adjusting the baffle, so that the detection efficiency is remarkably improved.

The invention provides a machine-made sand mortar performance regulation and control method based on hydration kinetics, and relates to the technical field of building materials. The method comprises the following steps: preparing and testing machine-made sand with different stone powder contents, gradation and flaky particle contents, determining a standard mix proportion of mortar, and testing the macroscopic performance of the mortar; hydration kinetic parameters are extracted through a hydration heat test, and the content of chemically bound water is obtained through thermogravimetric analysis; establishing a quantitative relation among the machine-made sand parameters, the hydration kinetic parameters and the macroscopic performance by utilizing correlation analysis, and determining key control parameters; and a machine-made sand parameter regulation and control principle taking hydration kinetics as a core is formed. According to the method, the mix proportion design is guided from the microscopic hydration mechanism level, the trial mixing workload is remarkably reduced, and the scientificity and efficiency of the mix proportion design are improved.

The embodiment of the application provides a PCB drilling house platform structure and a construction method, the platform structure comprises: a foundation soil layer at the bottom; a three-dimensional anti-static grounding net installed on the foundation soil layer, the three-dimensional anti-static grounding net comprises grounding feet inserted into the foundation soil layer and connecting columns extending upwards; a first stone powder layer laid on the upper surface of the foundation soil layer; a shock-absorbing material layer laid on the upper surface of the first stone powder layer; a second stone powder layer laid on the upper surface of the shock-absorbing material layer; a first concrete layer cast on the upper surface of the second stone powder layer; a second concrete layer cast on the upper surface of the first concrete layer, the thickness and strength of the second concrete layer are greater than those of the first concrete layer, and a double-layer bidirectional steel reinforcement framework is embedded in the second concrete layer; and a ground bearing layer laid on the second concrete layer, the top end of the connecting column extends above the ground bearing layer. The embodiment can prevent vibration and static electricity from interfering with the equipment in the PCB drilling house.